geo-l3-antarctica-stations-geodesic

Status: done
Score: 0.586
Duration: 21:36
Cost: 4.14¢
Model: deepseek/deepseek-v4-flash

Map (reference ← swipe → agent)

0:00
I need to put together the cross-station logistics-overlap maps for the Antarctic Treaty consultative meeting next month. Each Antarctic research station has a notional 200 km operational radius. Please pull stations from Overture south of -60 latitude, along with the Antarctic landmass and water features. For the first output I need the land-clipped station zones grouped into coalitions wherever they overlap. Each coalition gets an integer `coalition` id, and that column has to take more than one distinct value across the dataset. Every feature needs `station_id` and `station_name` as well. For the second output I need the over-water portion of each station's zone, attributed with the water features it intersects. Each row in that file must carry `station_id`, `station_name`, `water_id`, `water_name`, `water_subtype`, and a `water_source` column whose values are the literal Overture theme names `base.water` or `base.bathymetry`. Please write both as GeoParquet in an appropriate projected coordinate system for Antarctica, with MultiPolygon geometry: `station_spheres.geoparquet` for the land-clipped coalition polygons, and `station_water_overlap.geoparquet` for the per-station over-water intersections with the water attribution described above.
0:00
System info
{
  "adapter": "openrouter",
  "model": "deepseek/deepseek-v4-flash",
  "base_url": "https://openrouter.ai/api/v1"
}
0:04
Let me break down this task:

1. Get Antarctic research stations from Overture south of -60° latitude
2. Get Antarctic landmass and water features from Overture
3. Create 200 km operational radius buffers around each station
4. Clip station buffers to land (for first output)
5. Group land-clipped buffers into coalitions where they overlap
6. Create over-water portions of station buffers (for second output)
7. Intersect over-water portions with water features, attributing with water details

Outputs:
- `station_spheres.geoparquet` - land-clipped coalition polygons with coalition id, station_id, station_name
- `station_water_overlap.geoparquet` - per-station over-water intersections with water attribution

Let me start by exploring what's available.
0:04
0:04
Bash ls /work/
(no output)
0:04
Bash python -c "import overturemaps; help(overturemaps)" 2>&1 | head -50
Help on package overturemaps:

NAME
    overturemaps

PACKAGE CONTENTS
    __main__
    changelog
    cli
    core
    models
    releases
    state
    writers

FILE
    /usr/local/lib/python3.14/site-packages/overturemaps/__init__.py
0:08
Let me understand the Overture library better and look at available themes.
0:08
Bash python -c "
python -c "
import overturemaps
print(dir(overturemaps))
print('---')
print(overturemaps.__version__ if hasattr(overturemaps, '__version__') else 'no version')
"
['__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__path__', '__spec__', 'core', 'geodataframe', 'get_all_overture_types', 'models', 'record_batch_reader']
---
no version
0:09
Bash python -c "
python -c "
from overturemaps.core import available_themes, available_types
themes = available_themes()
print('Themes:', themes)
for t in themes:
    types = available_types(t)
    print(f'  {t}: {list(types.keys())[:10]}')
"
Traceback (most recent call last):
  File "<string>", line 2, in <module>
    from overturemaps.core import available_themes, available_types
ImportError: cannot import name 'available_themes' from 'overturemaps.core' (/usr/local/lib/python3.14/site-packages/overturemaps/core.py)
0:13
Let me look at the overturemaps API more carefully.
0:13
Bash python -c "
python -c "
from overturemaps.core import record_batch_reader
import inspect
print(inspect.signature(record_batch_reader))
print('---')
print(inspect.getsource(record_batch_reader))
" 2>&1 | head -60
(overture_type, bbox=None, release=None, connect_timeout=None, request_timeout=None, stac=False) -> pyarrow.lib.RecordBatchReader | None
---
def record_batch_reader(
    overture_type,
    bbox=None,
    release=None,
    connect_timeout=None,
    request_timeout=None,
    stac=False,
) -> Optional[pa.RecordBatchReader]:
    """Return a pyarrow RecordBatchReader for the desired bounding box and s3 path, or None on error."""
    result = _prepare_query(
        overture_type, bbox, release, connect_timeout, request_timeout, stac
    )
    if result is None:
        return None
    dataset, filter_expr = result
    return _record_batch_reader_from_dataset(dataset, filter_expr=filter_expr)
0:14
Bash python -c "
python -c "
import overturemaps.core as c
print([x for x in dir(c) if not x.startswith('_')])
"
['ALL_RELEASES', 'BBox', 'GeoDataFrame', 'HAS_GEOPANDAS', 'List', 'Optional', 'STAC_CATALOG_URL', 'Tuple', 'count_rows', 'ds', 'fs', 'geoarrow_schema_adapter', 'geodataframe', 'get_all_overture_types', 'get_available_releases', 'get_latest_release', 'io', 'json', 'pa', 'pc', 'pq', 'query_gers_registry', 'record_batch_reader', 'record_batch_reader_from_gers', 'sys', 'type_theme_map', 'urlopen']
0:18
Let me explore the Overture types available to understand how to get buildings/places/divisions (for stations), water, etc.
0:18
Bash python -c "
python -c "
from overturemaps.core import get_all_overture_types
types = get_all_overture_types()
for t in sorted(types):
    print(t)
"
address
bathymetry
building
building_part
connector
division
division_area
division_boundary
infrastructure
land
land_cover
land_use
place
segment
water
0:23
Great! So the Overture themes available include:
- `place` - for research stations (places)
- `land` - for Antarctic landmass
- `water` - for water features
- `bathymetry` - for bathymetry

Let me understand the data schema for each of these types.
0:23
Bash python -c "
python -c "
import pyarrow as pa
from overturemaps.core import record_batch_reader

# Check place schema
r = record_batch_reader('place')
if r:
    print('Place schema:')
    print(r.schema)
else:
    print('place failed')
"
Place schema:
id: string
geometry: binary
  -- field metadata --
  ARROW:extension:name: 'geoarrow.wkb'
categories: struct<primary: string, alternate: list<element: string>>
  child 0, primary: string
  child 1, alternate: list<element: string>
      child 0, element: string
confidence: double
websites: list<element: string>
  child 0, element: string
emails: list<element: string>
  child 0, element: string
socials: list<element: string>
  child 0, element: string
phones: list<element: string>
  child 0, element: string
brand: struct<wikidata: string, names: struct<primary: string, common: map<string, string ('common')>, rule (... 192 chars omitted)
  child 0, wikidata: string
  child 1, names: struct<primary: string, common: map<string, string ('common')>, rules: list<element: struct<variant: (... 159 chars omitted)
      child 0, primary: string
      child 1, common: map<string, string ('common')>
          child 0, common: struct<key: string not null, value: string> not null
              child 0, key: string not null
              child 1, value: string
      child 2, rules: list<element: struct<variant: string, language: string, perspectives: struct<mode: string, countries (... 87 chars omitted)
          child 0, element: struct<variant: string, language: string, perspectives: struct<mode: string, countries: list<element (... 72 chars omitted)
              child 0, variant: string
              child 1, language: string
              child 2, perspectives: struct<mode: string, countries: list<element: string>>
                  child 0, mode: string
                  child 1, countries: list<element: string>
                      child 0, element: string
              child 3, value: string
              child 4, between: list<element: double>
                  child 0, element: double
              child 5, side: string
addresses: list<element: struct<freeform: string, locality: string, postcode: string, region: string, country:  (... 8 chars omitted)
  child 0, element: struct<freeform: string, locality: string, postcode: string, region: string, country: string>
      child 0, freeform: string
      child 1, locality: string
      child 2, postcode: string
      child 3, region: string
      child 4, country: string
names: struct<primary: string, common: map<string, string ('common')>, rules: list<element: struct<variant: (... 159 chars omitted)
  child 0, primary: string
  child 1, common: map<string, string ('common')>
      child 0, common: struct<key: string not null, value: string> not null
          child 0, key: string not null
          child 1, value: string
  child 2, rules: list<element: struct<variant: string, language: string, perspectives: struct<mode: string, countries (... 87 chars omitted)
      child 0, element: struct<variant: string, language: string, perspectives: struct<mode: string, countries: list<element (... 72 chars omitted)
          child 0, variant: string
          child 1, language: string
          child 2, perspectives: struct<mode: string, countries: list<element: string>>
              child 0, mode: string
              child 1, countries: list<element: string>
                  child 0, element: string
          child 3, value: string
          child 4, between: list<element: double>
              child 0, element: double
          child 5, side: string
sources: list<element: struct<property: string, dataset: string, license: string, record_id: string, update_t (... 65 chars omitted)
  child 0, element: struct<property: string, dataset: string, license: string, record_id: string, update_time: string, c (... 50 chars omitted)
      child 0, property: string
      child 1, dataset: string
      child 2, license: string
      child 3, record_id: string
      child 4, update_time: string
      child 5, confidence: double
      child 6, between: list<element: double>
          child 0, element: double
operating_status: string
basic_category: string
taxonomy: struct<primary: string, hierarchy: list<element: string>, alternates: list<element: string>>
  child 0, primary: string
  child 1, hierarchy: list<element: string>
      child 0, element: string
  child 2, alternates: list<element: string>
      child 0, element: string
version: int32
bbox: struct<xmin: double, xmax: double, ymin: double, ymax: double>
  child 0, xmin: double
  child 1, xmax: double
  child 2, ymin: double
  child 3, ymax: double
-- schema metadata --
geo: '{"version": "1.1.0", "primary_column": "geometry", "columns": {"geo' + 275
1:24
Let me understand the data available:

1. `place` - research stations with categories
2. `land` - Antarctic landmass
3. `water` - water features
4. `bathymetry` - bathymetry

Let me look at the land and water schemas too, and understand how to filter by geography.

First, let me check how to use bbox filtering and what land/water data look like.
1:24
Bash python -c "
python -c "
from overturemaps.core import record_batch_reader

for t in ['land', 'water', 'bathymetry']:
    r = record_batch_reader(t)
    if r:
        print(f'{t} schema:')
        print(r.schema)
        print('---')
"
<exit_code>-1</exit_code>
<error>Command timed out after 120000ms</error>
3:28
The command timed out, likely because it's fetching data globally. Let me try with a bbox filter and also restart the approach - I need to be smarter about this. Let me work with a bbox for Antarctica.

Actually, the global queries are too large. Let me use a bounding box for Antarctica and filter by geometry later.
3:28
Bash python -c "
python -c "
from overturemaps.core import record_batch_reader, get_all_overture_types

# Just get the schema without downloading much data
for t in ['place', 'water', 'land', 'bathymetry']:
    try:
        r = record_batch_reader(t, bbox=(-180, -90, 180, -60))
        if r:
            print(f'{t} schema columns:')
            for field in r.schema:
                print(f'  {field.name}: {field.type}')
            print()
    except Exception as e:
        print(f'{t}: {e}')
" 2>&1
place schema columns:
  id: string
  geometry: binary
  categories: struct<primary: string, alternate: list<element: string>>
  confidence: double
  websites: list<element: string>
  emails: list<element: string>
  socials: list<element: string>
  phones: list<element: string>
  brand: struct<wikidata: string, names: struct<primary: string, common: map<string, string ('common')>, rules: list<element: struct<variant: string, language: string, perspectives: struct<mode: string, countries: list<element: string>>, value: string, between: list<element: double>, side: string>>>>
  addresses: list<element: struct<freeform: string, locality: string, postcode: string, region: string, country: string>>
  names: struct<primary: string, common: map<string, string ('common')>, rules: list<element: struct<variant: string, language: string, perspectives: struct<mode: string, countries: list<element: string>>, value: string, between: list<element: double>, side: string>>>
  sources: list<element: struct<property: string, dataset: string, license: string, record_id: string, update_time: string, confidence: double, between: list<element: double>>>
  operating_status: string
  basic_category: string
  taxonomy: struct<primary: string, hierarchy: list<element: string>, alternates: list<element: string>>
  version: int32
  bbox: struct<xmin: double, xmax: double, ymin: double, ymax: double>

water schema columns:
  id: string
  names: struct<primary: string, common: map<string, string ('common')>, rules: list<element: struct<variant: string, language: string, perspectives: struct<mode: string, countries: list<element: string>>, value: string, between: list<element: double>, side: string>>>
  subtype: string
  class: string
  sources: list<element: struct<property: string, dataset: string, license: string, record_id: string, update_time: string, confidence: double, between: list<element: double>>>
  source_tags: map<string, string ('source_tags')>
  level: int32
  wikidata: string
  is_intermittent: bool
  is_salt: bool
  geometry: binary
  version: int32
  bbox: struct<xmin: double, xmax: double, ymin: double, ymax: double>

land schema columns:
  id: string
  names: struct<primary: string, common: map<string, string ('common')>, rules: list<element: struct<variant: string, language: string, perspectives: struct<mode: string, countries: list<element: string>>, value: string, between: list<element: double>, side: string>>>
  subtype: string
  class: string
  sources: list<element: struct<property: string, dataset: string, license: string, record_id: string, update_time: string, confidence: double, between: list<element: double>>>
  source_tags: map<string, string ('source_tags')>
  level: int32
  wikidata: string
  surface: string
  elevation: int32
  geometry: binary
  version: int32
  bbox: struct<xmin: double, xmax: double, ymin: double, ymax: double>

bathymetry schema columns:
  id: string
  depth: int32
  cartography: struct<prominence: int32, min_zoom: int32, max_zoom: int32, sort_key: int32>
  geometry: binary
  sources: list<element: struct<property: string, dataset: string, license: string, record_id: string, update_time: string, confidence: double, between: list<element: double>>>
  version: int32
  bbox: struct<xmin: double, xmax: double, ymin: double, ymax: double>
4:42
Let me design the approach:

1. **Get Antarctic research stations** from `place` theme with categories related to research stations, south of -60 latitude.
2. **Get land** from `land` theme for Antarctica (south of -60).
3. **Get water features** from `water` theme (south of -60).
4. **Get bathymetry** from `bathymetry` theme (south of -60).

For each station:
- Create a 200km buffer
- Clip to land → coalition polygons
- Clip to water → intersect with water features

Let me start by exploring what categories are available in the place data for stations.
4:42
Bash python -c "
python -c "
from overturemaps.core import record_batch_reader
import pyarrow as pa
import pyarrow.compute as pc

# Get a sample of places south of -60 to see what categories exist
r = record_batch_reader('place', bbox=(-180, -90, 180, -60))
if r:
    tbl = r.read_next_batch()
    print(f'Got {len(tbl)} rows')
    # Check categories
    cats = tbl.column('categories')
    print(type(cats))
    print(cats[0])
else:
    print('Failed')
" 2>&1
Got 21 rows
<class 'pyarrow.lib.StructArray'>
[('primary', 'retail'), ('alternate', None)]
4:55
There are only 21 places south of -60 in Overture - that's not many. Let me look at the categories more carefully to find research stations.
4:55
Bash python -c "
python -c "
from overturemaps.core import record_batch_reader
import pyarrow as pa
import pyarrow.compute as pc

# Get all places south of -60 to see what's there
r = record_batch_reader('place', bbox=(-180, -90, 180, -60))
if r:
    tbl = r.read_all()
    print(f'Total: {len(tbl)} rows')
    for i in range(len(tbl)):
        row = tbl.slice(i, 1)
        names = row.column('names')[0]
        cats = row.column('categories')[0]
        idv = row.column('id')[0].as_py()
        primary = cats['primary'].as_py()
        name = names['primary'].as_py() if names else None
        print(f'{idv}: name={name}, category={primary}')
else:
    print('Failed')
" 2>&1
Total: 246 rows
ff93e6a3-b7fc-4691-980a-c36820a301c4: name=Poeanuanua, category=retail
e4cd796b-b4c6-47e1-927b-79edfc50c48c: name=Muebles Marispal Algeciras, category=furniture_store
52dd18ca-aaae-4f06-aa53-06349b302c66: name=Lamoon Cafe & Restaurant - สระบุรี, category=cafe
b01d6401-437f-4be8-bb25-21055d6881fa: name=Cap College Mariveles Bataan, category=college_university
d61f38d3-a73b-44d6-ae69-1120a1518aaf: name=מעדני מניה Maadaney Mania, category=delicatessen
855105af-cb9a-4c55-a72e-c5ae356f1c5e: name=Te Fare Informatique, category=hardware_store
237cf98b-d9b0-4756-82ee-528c55f41e29: name=Samira's Hair Fashion +599 98693311, category=beauty_salon
43c099d7-9d1b-41a3-8e43-320e2eacf6fa: name=CAMBO Cleaner, category=None
d6149cd5-5a22-43e1-ae86-e7577501d0db: name=Iriga City Public Library, category=public_and_government_association
06cbc176-ade9-45fa-bf4d-1e1047961cd3: name=Dinastia Nortena, category=None
37b38556-e96f-4489-8369-198afd14715f: name=Ser Esencia Restaurant, category=restaurant
a8fae705-fa37-4416-9500-53834b942c97: name=مدينة رشيد Rosetta city, category=None
e926755f-2666-4c23-b411-a44ec025a072: name=Blessed Souls Photography & Film, category=professional_services
2a57ff3e-de19-4d8c-9a80-894baa013331: name=黎齊妙中醫診所, category=hospital
cae3dffc-923f-486f-a9dd-b3978352cd3a: name=dieukhaclienvu.com - phù điêu,điêu khắc đá nhân tạo composite,cảnh quan đẹp, category=arts_and_crafts
6c026c49-4a4f-44a9-b18b-2e858b4176bd: name=R-AGE Nation Apparel, category=womens_clothing_store
d586b57b-b36c-41c8-8c6b-0121de8150d0: name=Basketball Forever, category=mass_media
f4ed31ee-3bc1-49e9-8a28-3005e0e22ac1: name=Marc Silber, category=professional_services
f105891e-42e1-4c5f-90c2-c2932966b6e9: name=Tama Manège Import, category=park
4acb8ee7-5b68-48c7-b77c-a1849ac3280b: name=Irantha Fonseka, category=None
34c0cba6-9f9d-4eeb-bb37-63e4fd235441: name=Ozhousestudio, category=topic_concert_venue
830e25c9-3ec0-488e-921c-11670b9d5c98: name=Jamela Payne, category=panamanian_restaurant
b9f600a7-98dd-4d9b-b1a2-70d1d79ed9b2: name=In Aeternum Historia, category=print_media
a09c28e0-2005-42d5-b55e-4b2dda79609a: name=Destiny Monique, category=arts_and_entertainment
aec03ab5-bce4-484f-a042-9f6b49c3ea93: name=Frente al Mar, category=eat_and_drink
7ae461e2-5c10-4eab-b2aa-b253d5c9cba6: name=SaiJai ใส่ใจ เครื่องปรุงและอาหารสุขภาพ, category=restaurant
eb5e3c92-2c72-48a2-832d-9bf7e6ae3192: name=Tay Noel’s Kalan-an, category=fast_food_restaurant
d4d2c7e1-1e50-4362-90ae-bf74cd3646e8: name=גלית קאשי עיצוב תכשיטים, category=jewelry_store
028cd213-5f11-4b3e-bd5f-7ed9e22e3e88: name=GypsyMaal, category=fashion_accessories_store
83847f48-3480-47a9-878f-132b275c2880: name=Prasad Art Gallery, category=art_gallery
de2b1fec-574c-4461-8bd6-6a2c2b2e3c63: name=Tahlia Marie, category=None
0f605256-4adc-4d04-bdab-44b6e8ca17e1: name=Barbaro Negocios Inmobiliarios, category=real_estate
ff41a340-bd7c-49c8-9eb8-be5903a3653a: name=VALKUR Perú, category=lawyer
09e9bea6-d40f-41c2-a88f-561cba558ad3: name=Experience Rarotonga, category=tours
2a30eed0-ca25-4aa6-9147-cece509f4f09: name=Caprichos Accesorios, category=fashion_accessories_store
d8a1c3a5-fadc-448d-a543-22067b69d36e: name=Emmy J, category=None
f0847dff-07cd-422a-81c9-f20a40b26106: name=Asra Derm Official, category=None
1c2353f9-bc96-4304-8b30-35e0b4ffc40e: name=Mobilio Suksawat โมบิลิโอ้ สาขาสุขสวัสดิ์, category=shopping
c2eb4ea6-634e-4cf6-9f53-fe826b4dcb61: name=ال سلوع لتجاره السيراميك والادوات الصحيه, category=real_estate
2a100ade-be10-41c0-b6c2-a49e921a24e7: name=Port Lockroy, Antarctic Peninsula, category=landmark_and_historical_building
f73848f3-abaa-432b-b3ed-8092a6b39b9e: name=Palmer Station, Antarctica, category=home_developer
f4491389-9904-4c46-ad66-18c0e736e547: name=BellaVista Voronet, category=holiday_rental_home
ea957818-ac33-4951-9f52-8845ee4419b3: name=Sachet Imprimé, category=None
eb858253-acd6-4231-9ce9-e0e4c799d7a0: name=Brown Station, category=landmark_and_historical_building
ba9d8ef6-32f3-4098-a010-b5b485e4e75f: name=González Videla Antarctic Base, category=airport
90087bb3-b8ba-4507-886b-104fe36bc40c: name=Cuverville Island, category=landmark_and_historical_building
49b9a6e2-2e53-4040-8cea-39b554a52b66: name=Madison Beer, category=beer_bar
ca45ce1c-ca5e-4cd8-8f98-5975f5706828: name=Dj daya, category=music_production
a593665a-c1c6-4acd-b0c0-d25735d6dd4c: name=Matrioska Laços, category=childrens_clothing_store
9d364bf8-eaaf-4f79-ad45-195f74f49a93: name=Antarctica, Antarctic Circle, category=landmark_and_historical_building
3bf8e968-6050-4ee6-8a60-f046db54cc02: name=Esperanto Island, Antarctica, category=landmark_and_historical_building
ddfff404-5576-4082-8528-ef0d79f2dbb0: name=Yankee Harbor, category=landmark_and_historical_building
6240b821-30cb-4fe4-a08a-6fddb4fe2978: name=Bellingshausen Russian Antarctic Station, category=educational_research_institute
e4b318d7-4b12-4b00-806c-e21f1ca962ac: name=Bahia Fildes (Antartica), category=structure_and_geography
eebb9028-32bd-4b7c-a8c2-7a620a35a072: name=Crystal Power, category=jewelry_store
b5dbce59-268a-4e42-9bb2-211da08f53e5: name=Bestiario Moderno, category=print_media
18414d58-4e4c-480f-bfab-ee3e224c5b5e: name=Base Marambio, Antartida Argentina, category=central_government_office
015df87e-1265-4d80-844b-97a4c1af44a5: name=Marambio Base, category=airport
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e53f80a9-1a41-4215-84b6-6b71e2e2cbbd: name=海港青年商會 JCI Harbour, category=community_services_non_profits
696feff0-bd87-4a7b-b778-479dced0681a: name=মুক্তি হারবাল চিকিৎসালয়-Mukti Herbal Chikitsalay, category=family_practice
ce4a2fc8-49de-48b1-babe-ad78bf4328ac: name=Herrlich Beauty By Cloriss, category=beauty_salon
fcdd73f9-5cb8-4812-be88-099727bf3936: name=Mario-Zucchelli-Station, category=None
693626b4-7ef6-41ee-bc0a-ae604b3351d2: name=Psicóloga Serly C. de Souza, category=psychotherapist
bb48b222-57c4-4c85-8743-752df4bba2ca: name=Polární stanice McMurdo, category=landmark_and_historical_building
d5882de0-07ff-46b9-a3c0-bbfb0cc9552c: name=Base McMurdo, category=landmark_and_historical_building
d74e5a73-042c-4694-9e16-fa9622f203b3: name=Base antarctique McMurdo, category=landmark_and_historical_building
fd4c334a-7431-4d8c-888b-3f8c7adda8d1: name=Gallagher Pub, category=bar
b3790f8f-7451-4a53-abff-62ab3af51607: name=Southern Exposure, category=bar
9e4a3d08-61ff-4b24-b19f-ff6701d7f012: name=ZiroZiro, category=religious_organization
82b40435-6b61-4d8e-9caa-7ff1d248b8a1: name=McMurdo General Hospital, category=hospital
2390d849-b20b-4b63-9be3-0209ee70518b: name=Coffee House, category=coffee_shop
64a5e802-0687-4df3-8389-5a4f84e649a0: name=Chapel of the Snows, category=church_cathedral
e0e03e63-936d-427e-92bc-815a9a44b6a5: name=Pegasus Field, category=airport
512534a4-cc70-416d-89f0-9144564048d3: name=悦聖翡翠, category=fashion
5:28
The Overture places feature a lot of noisy data. Let me think about how to find actual Antarctic research stations. The approach should be:

1. Look at places with categories like "educational_research_institute", "landmark_and_historical_building", "airport", etc. that have "station", "base", "antarctic" in their names south of -60.

2. Better approach: Use the Overture `place` data and filter for research stations/antarctic bases. Let me also look at the geometry to see where the actual stations are located.

Actually, a much better approach would be to use known Antarctic research stations lists. But the instruction says "pull stations from Overture" - so let me use Overture places.

Let me write the main script now. The approach:

1. Download all Overture places south of -60, filter for research stations/antarctic bases
2. Download land polygon data for Antarctica
3. Download water and bathymetry data
4. Create 200km buffers around stations
5. Clip buffers to land -> coalitions
6. Clip buffers to water -> water overlaps

Let me first understand what data I get from the place query. I noticed most of those results have coordinates that are NOT in Antarctica - they're all over the world. The bbox parameter for record_batch_reader seems to not be filtering properly? Let me check.

Actually wait - bbox in overturemaps uses (xmin, ymin, xmax, ymax). Let me check if the geometry column has actual coordinates.
5:28
Bash python -c "
python -c "
from overturemaps.core import record_batch_reader
import pyarrow as pa
import pyarrow.compute as pc

# Get geometries for a few rows to check coordinates
r = record_batch_reader('place', bbox=(-180, -90, 180, -60))
if r:
    tbl = r.read_all()
    print(f'Total: {len(tbl)}')
    # Look at bbox column for first 10
    bboxes = tbl.column('bbox')
    for i in range(min(10, len(tbl))):
        bb = bboxes[i]
        print(f'{i}: xmin={bb[\"xmin\"]}, ymin={bb[\"ymin\"]}, xmax={bb[\"xmax\"]}, ymax={bb[\"ymax\"]}')
" 2>&1
Total: 246
0: xmin=-172.8719482421875, ymin=-64.6113510131836, xmax=-172.87191772460938, ymax=-64.61134338378906
1: xmin=-156.796875, ymin=-78.34941101074219, xmax=-156.796875, ymax=-78.34940338134766
2: xmin=-156.20516967773438, ymin=-77.52698516845703, xmax=-156.2051544189453, ymax=-77.5269775390625
3: xmin=-143.4375, ymin=-82.49482727050781, xmax=-143.4375, ymax=-82.49481201171875
4: xmin=-144.84375, ymin=-80.76062774658203, xmax=-144.84375, ymax=-80.76061248779297
5: xmin=-146.87623596191406, ymin=-65.75599670410156, xmax=-146.876220703125, ymax=-65.75598907470703
6: xmin=-136.40625, ymin=-74.77584838867188, xmax=-136.40625, ymax=-74.77584075927734
7: xmin=-137.6954345703125, ymin=-75.42521667480469, xmax=-137.69540405273438, ymax=-75.42520904541016
8: xmin=-136.546875, ymin=-81.08232116699219, xmax=-136.54685974121094, ymax=-81.08231353759766
9: xmin=-137.8125, ymin=-81.92318725585938, xmax=-137.8125, ymax=-81.92317962646484
6:23
Lots of the places aren't actually Antarctic stations. The Overture places data contains many POIs that aren't stations. I need to find actual research stations. Let me filter by things with station names.

I see some promising ones:
- "Port Lockroy, Antarctic Peninsula" 
- "Palmer Station, Antarctica"
- "Brown Station"
- "González Videla Antarctic Base"
- "Bellingshausen Russian Antarctic Station"
- "Base Marambio, Antartida Argentina"
- "Esperanza Base, Antarctica"
- "Vostok İstasyonu" (Vostok Station)
- "Base antarctique Dumont-d'Urville"
- "Mario-Zucchelli-Station"
- "Polární stanice McMurdo" (McMurdo Station)
- "Antarctica/Troll"

But this won't be comprehensive. The Overture `place` theme may not have all research stations. Let me think about this differently. The task asks me to pull stations from Overture south of -60. In Overture, a "station" might be tagged differently.

Actually, looking more carefully at the data, the `categories.primary` field has things like `educational_research_institute`, `airport` (for stations with runways), `landmark_and_historical_building` etc. 

Let me look more carefully at which records could be Antarctic stations. Let me search more systematically for station-related entries.
6:23
6:23
Bash python -c "
python -c "
from overturemaps.core import record_batch_reader
import pyarrow as pa
import pyarrow.compute as pc
import json

r = record_batch_reader('place', bbox=(-180, -90, 180, -60))
if r:
    tbl = r.read_all()
    # Print those with station/base/antarctic in name
    names = tbl.column('names')
    ids = tbl.column('id')
    cats = tbl.column('categories')
    for i in range(len(tbl)):
        n = names[i]
        if n:
            name = n['primary'].as_py()
            if name and any(k in (name.lower() or '') for k in ['station', 'base', 'antarctic', 'antarct', 'vostok', 'mcmurdo', 'dumont', 'marambio', 'esperanza', 'bellingshausen', 'palmer', 'brown', 'troll', 'zucchelli', 'halley', 'rothschild']):
                cat = cats[i]
                primary = cat['primary'].as_py() if cat else None
                cid = ids[i].as_py()
                # Get geometry
                print(f'{cid}: \"{name}\" -> cat={primary}')
" 2>&1
2a100ade-be10-41c0-b6c2-a49e921a24e7: "Port Lockroy, Antarctic Peninsula" -> cat=landmark_and_historical_building
f73848f3-abaa-432b-b3ed-8092a6b39b9e: "Palmer Station, Antarctica" -> cat=home_developer
eb858253-acd6-4231-9ce9-e0e4c799d7a0: "Brown Station" -> cat=landmark_and_historical_building
ba9d8ef6-32f3-4098-a010-b5b485e4e75f: "González Videla Antarctic Base" -> cat=airport
9d364bf8-eaaf-4f79-ad45-195f74f49a93: "Antarctica, Antarctic Circle" -> cat=landmark_and_historical_building
3bf8e968-6050-4ee6-8a60-f046db54cc02: "Esperanto Island, Antarctica" -> cat=landmark_and_historical_building
6240b821-30cb-4fe4-a08a-6fddb4fe2978: "Bellingshausen Russian Antarctic Station" -> cat=educational_research_institute
18414d58-4e4c-480f-bfab-ee3e224c5b5e: "Base Marambio, Antartida Argentina" -> cat=central_government_office
015df87e-1265-4d80-844b-97a4c1af44a5: "Marambio Base" -> cat=airport
4775fc70-d68b-48b4-af40-377af7e9a457: "Chapel of the Blessed Virgin of Lujan, Antarctica" -> cat=church_cathedral
11037d14-337b-4a53-a23b-85566484f016: "Base Antártica Marambio" -> cat=public_and_government_association
b1662153-d852-4a90-b8a7-5d5e113439bb: "Base Esperanza, Antartida Argentina" -> cat=airport
8536af5a-82ba-46ed-bd6c-069082cbfc5d: "Esperanza Base, Antarctica" -> cat=landmark_and_historical_building
e3417e97-f283-4ecc-a32b-ae164e69903f: "Antarctica/Troll" -> cat=landmark_and_historical_building
63b91770-28a5-4a5c-bea8-0e5842150734: "Lake Vostok" -> cat=landmark_and_historical_building
bfd01a42-92a7-43f9-a7d3-0cc7fb3157b4: "Vostok İstasyonu" -> cat=landmark_and_historical_building
04d8258a-e765-4a4d-96c0-20cd3b11a9c3: "Base antarctique Dumont-d'Urville" -> cat=landmark_and_historical_building
26f0564a-e108-46da-b7aa-a4f3aca0daa2: "Antarctic Plateau" -> cat=landmark_and_historical_building
fcdd73f9-5cb8-4812-be88-099727bf3936: "Mario-Zucchelli-Station" -> cat=None
bb48b222-57c4-4c85-8743-752df4bba2ca: "Polární stanice McMurdo" -> cat=landmark_and_historical_building
d5882de0-07ff-46b9-a3c0-bbfb0cc9552c: "Base McMurdo" -> cat=landmark_and_historical_building
d74e5a73-042c-4694-9e16-fa9622f203b3: "Base antarctique McMurdo" -> cat=landmark_and_historical_building
82b40435-6b61-4d8e-9caa-7ff1d248b8a1: "McMurdo General Hospital" -> cat=hospital
6:59
There are many place records in Antarctica. I need to identify research stations specifically. Let me also check if there's a better way - using Overture infrastructure (infrastructure theme) or division_area for settlements, or look at place categories more closely.

Actually, let me think about the approach more carefully:

1. First, I need to find Antarctic research stations. The `place` data has a mix of things. I should look for stations specifically. Let me filter by category or name pattern.

2. The best approach might be to:
   - Download all `place` records south of -60
   - Filter those that are research stations (by name patterns like "Station", "Base", etc.)
   - Download `land` data to clip the 200km buffers
   - Download `water` and `bathymetry` for the water intersection analysis
   - Use an Antarctic projected CRS (e.g., EPSG:3031 - Antarctic Polar Stereographic)
   - Create 200km buffers, clip to land, create coalitions
   - Create over-water portions with water attribution

Let me also check the infrastructure and division_area types for stations.

Actually, let me check if there's a taxonomy field that indicates "research_station" or similar.
6:59
Bash python -c "
python -c "
from overturemaps.core import record_batch_reader
import pyarrow as pa
import pyarrow.compute as pc

r = record_batch_reader('place', bbox=(-180, -90, 180, -60))
if r:
    tbl = r.read_all()
    taxonomies = tbl.column('taxonomy')
    for i in range(len(tbl)):
        tax = taxonomies[i]
        if tax:
            primary = tax['primary'].as_py()
            name = tbl.column('names')[i]
            n = name['primary'].as_py() if name else None
            if n and any(k in (n.lower() or '') for k in ['station', 'base', 'antarct', 'vostok', 'mcmurdo', 'dumont', 'marambio', 'esperanza', 'bellingshausen', 'palmer', 'brown', 'troll', 'zucchelli']):
                print(f'{n}: taxonomy={primary}, hierarchy={tax[\"hierarchy\"].as_py()}')
" 2>&1
Port Lockroy, Antarctic Peninsula: taxonomy=historic_site, hierarchy=['cultural_and_historic', 'historic_site']
Palmer Station, Antarctica: taxonomy=home_developer, hierarchy=['services_and_business', 'real_estate_service', 'builder', 'home_developer']
Brown Station: taxonomy=historic_site, hierarchy=['cultural_and_historic', 'historic_site']
González Videla Antarctic Base: taxonomy=airport, hierarchy=['travel_and_transportation', 'air_transport_facility_or_service', 'airport']
Antarctica, Antarctic Circle: taxonomy=historic_site, hierarchy=['cultural_and_historic', 'historic_site']
Esperanto Island, Antarctica: taxonomy=historic_site, hierarchy=['cultural_and_historic', 'historic_site']
Bellingshausen Russian Antarctic Station: taxonomy=educational_research_institute, hierarchy=['education', 'research_institute', 'educational_research_institute']
Base Marambio, Antartida Argentina: taxonomy=government_office, hierarchy=['community_and_government', 'government_office']
Marambio Base: taxonomy=airport, hierarchy=['travel_and_transportation', 'air_transport_facility_or_service', 'airport']
Chapel of the Blessed Virgin of Lujan, Antarctica: taxonomy=christian_place_of_worship, hierarchy=['cultural_and_historic', 'religious_organization', 'place_of_worship', 'christian_place_of_worship']
Base Antártica Marambio: taxonomy=government_office, hierarchy=['community_and_government', 'government_office']
Base Esperanza, Antartida Argentina: taxonomy=airport, hierarchy=['travel_and_transportation', 'air_transport_facility_or_service', 'airport']
Esperanza Base, Antarctica: taxonomy=historic_site, hierarchy=['cultural_and_historic', 'historic_site']
Antarctica/Troll: taxonomy=historic_site, hierarchy=['cultural_and_historic', 'historic_site']
Lake Vostok: taxonomy=historic_site, hierarchy=['cultural_and_historic', 'historic_site']
Vostok İstasyonu: taxonomy=historic_site, hierarchy=['cultural_and_historic', 'historic_site']
Base antarctique Dumont-d'Urville: taxonomy=historic_site, hierarchy=['cultural_and_historic', 'historic_site']
Antarctic Plateau: taxonomy=historic_site, hierarchy=['cultural_and_historic', 'historic_site']
Mario-Zucchelli-Station: taxonomy=None, hierarchy=None
Polární stanice McMurdo: taxonomy=historic_site, hierarchy=['cultural_and_historic', 'historic_site']
Base McMurdo: taxonomy=historic_site, hierarchy=['cultural_and_historic', 'historic_site']
Base antarctique McMurdo: taxonomy=historic_site, hierarchy=['cultural_and_historic', 'historic_site']
McMurdo General Hospital: taxonomy=hospital, hierarchy=['health_care', 'hospital']
7:40
I can see the place data isn't well tagged for stations. Let me look at what Overture has for `divisions` or see if there's a better way to get Antarctic research stations. Maybe I should also check OSM data or use overturemaps CLI to list available types more thoroughly.

Actually, looking at the place data, I see a bunch of stations but they're poorly categorized. Let me think about how to approach this.

The user wants:
1. Antarctic research stations south of -60 latitude
2. Their 200 km operational radius zones clipped to land (Antarctic landmass) 
3. Grouping into coalitions based on overlap
4. Over-water portions attributed with water features

Let me look for a comprehensive list. The Overture `place` type has stations like:
- Palmer Station
- Brown Station
- González Videla Antarctic Base
- Bellingshausen Russian Antarctic Station
- Base Marambio / Marambio Base
- Base Esperanza / Esperanza Base
- Troll Station (Antarctica/Troll)
- Vostok Station (Vostok İstasyonu)
- Dumont-d'Urville Base
- Mario Zucchelli Station
- McMurdo Station (multiple entries)

There are multiple entries for the same stations (Marambio, Esperanza, McMurdo all have duplicates). Let me check the geometries to deduplicate.

Actually, let me take a step back and use a more comprehensive approach. Let me lean on the Overture places and also consider using DuckDB or OSM data. But first let me check if the Overture `division` theme has Antarctica info.
7:40
Bash python -c "
python -c "
from overturemaps.core import record_batch_reader
import pyarrow as pa
import pyarrow.compute as pc

r = record_batch_reader('division', bbox=(-180, -90, 180, -60))
if r:
    tbl = r.read_all()
    print(f'Total divisions: {len(tbl)}')
    for field in tbl.schema:
        print(f'  {field.name}: {field.type}')
" 2>&1
Total divisions: 49
  id: string
  geometry: binary
  country: string
  sources: list<element: struct<property: string, dataset: string, license: string, record_id: string, update_time: string, confidence: double, between: list<element: double>>>
  subtype: string
  admin_level: int32
  class: string
  names: struct<primary: string, common: map<string, string ('common')>, rules: list<element: struct<variant: string, language: string, perspectives: struct<mode: string, countries: list<element: string>>, value: string, between: list<element: double>, side: string>>>
  wikidata: string
  perspectives: struct<mode: string, countries: list<element: string>>
  local_type: map<string, string ('local_type')>
  region: string
  hierarchies: list<element: list<element: struct<division_id: string, subtype: string, name: string>>>
  parent_division_id: string
  norms: struct<driving_side: string>
  population: int32
  capital_division_ids: list<element: string>
  capital_of_divisions: list<element: struct<division_id: string, subtype: string>>
  cartography: struct<prominence: int32, min_zoom: int32, max_zoom: int32, sort_key: int32>
  version: int32
  bbox: struct<xmin: double, xmax: double, ymin: double, ymax: double>
7:54
 
7:54
Bash python -c "
python -c "
from overturemaps.core import record_batch_reader
import pyarrow as pa

r = record_batch_reader('division', bbox=(-180, -90, 180, -60))
if r:
    tbl = r.read_all()
    names = tbl.column('names')
    subtypes = tbl.column('subtype')
    for i in range(len(tbl)):
        n = names[i]
        name = n['primary'].as_py() if n else 'None'
        sub = subtypes[i].as_py()
        print(f'{i}: {name} ({sub})')
" 2>&1
0: Amundsen–Scott South Pole (locality)
1: Rothera Research Station (locality)
2: Base Antártica San Martín (locality)
3: Vernadsky Research Base (locality)
4: Palmer Station (locality)
5: 남극세종과학기지 (locality)
6: Base Artigas (locality)
7: Беллинсгаузен (locality)
8: Base Profesor Julio Escudero (neighborhood)
9: Base Presidente Eduardo Frei Montalva (neighborhood)
10: Villa Las Estrellas (locality)
11: 长城站 (locality)
12: Base Naval Antartica Arturo Prat (locality)
13: Base Carlini (locality)
14: Arctowski (locality)
15: Estação Antártica Comandante Ferraz (locality)
16: Base Bernardo O’Higgins (locality)
17: Deutsche Antarktis-Empfangsstation O'Higgins (locality)
18: Fortín Sargento Cabral (locality)
19: Base Esperanza (neighborhood)
20: Base Marambio (locality)
21: Base Antártica Orcadas (locality)
22: Base Antártica Belgrano II (locality)
23: Halley VI Research Station (locality)
24: Nordenskiöld Base (neighborhood)
25: Neumayer-Station III (locality)
26: Antarctica (country)
27: Troll (locality)
28: Новолазаревская (locality)
29: Maitri Station (locality)
30: 昭和基地 (locality)
31: Mawson Station (locality)
32: Bharati Research Station (locality)
33: 中山站 (locality)
34: Прогресс (locality)
35: 昆仑站 (locality)
36: Davis Station (locality)
37: Мирный (locality)
38: Stacja im. A.B. Dobrowolskiego (locality)
39: Восток (locality)
40: Casey Station (locality)
41: Concordia Station (locality)
42: Camp d'été (neighborhood)
43: Base Dumont d'Urville (locality)
44: 秦岭站 (locality)
45: 남극장보고과학기지 (locality)
46: Stazione Mario Zucchelli (locality)
47: McMurdo Station (locality)
48: Scott Base (locality)
8:09
Now I can see that the `division` theme has the Antarctic research stations as localities with much better data. Let me also get the geometry for these divisions and extract the stations south of -60 to work with.

Let me also check what geometries these divisions have - they might be point geometries.
8:09
8:09
Bash python -c "
python -c "
from overturemaps.core import record_batch_reader, geodataframe
import pyarrow as pa

r = record_batch_reader('division', bbox=(-180, -90, 180, -60))
if r:
    tbl = r.read_all()
    print(f'Total: {len(tbl)}')
    print(f'Columns: {tbl.column_names}')
    # Check the geometry column binary type and try converting
    print(f'Geometry type: {tbl.schema.field(\"geometry\").type}')
    # Try to get a geopandas dataframe
    gdf = geodataframe(tbl)
    print(gdf.head())
    print(f'Geometry types: {gdf.geom_type.unique()}')
    print(f'CRS: {gdf.crs}')
" 2>&1
Total: 49
Columns: ['id', 'geometry', 'country', 'sources', 'subtype', 'admin_level', 'class', 'names', 'wikidata', 'perspectives', 'local_type', 'region', 'hierarchies', 'parent_division_id', 'norms', 'population', 'capital_division_ids', 'capital_of_divisions', 'cartography', 'version', 'bbox']
Geometry type: binary
Traceback (most recent call last):
  File "<string>", line 13, in <module>
    gdf = geodataframe(tbl)
  File "/usr/local/lib/python3.14/site-packages/overturemaps/core.py", line 342, in geodataframe
    reader = record_batch_reader(
        overture_type,
    ...<4 lines>...
        stac=stac,
    )
  File "/usr/local/lib/python3.14/site-packages/overturemaps/core.py", line 307, in record_batch_reader
    result = _prepare_query(
        overture_type, bbox, release, connect_timeout, request_timeout, stac
    )
  File "/usr/local/lib/python3.14/site-packages/overturemaps/core.py", line 244, in _prepare_query
    path = _dataset_path(overture_type, release)
  File "/usr/local/lib/python3.14/site-packages/overturemaps/core.py", line 409, in _dataset_path
    theme = type_theme_map[overture_type]
            ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
TypeError: cannot use 'pyarrow.lib.Table' as a dict key (unhashable type: 'pyarrow.lib.Table')
8:25
The `geodataframe()` function expects a different call signature. Let me use pyogrio or shapely directly to convert the WKB geometries.
8:25
Bash python -c "
python -c "
from overturemaps.core import record_batch_reader
import geopandas as gpd
from shapely import wkb
import pyarrow as pa

r = record_batch_reader('division', bbox=(-180, -90, 180, -60))
if r:
    tbl = r.read_all()
    print(f'Rows: {len(tbl)}')
    
    # Convert WKB geometry column
    geoms = []
    for i in range(len(tbl)):
        geom_bytes = tbl.column('geometry')[i].as_py()
        geom = wkb.loads(geom_bytes)
        geoms.append(geom)
    
    names_col = tbl.column('names')
    ids_col = tbl.column('id')
    
    names = []
    ids = []
    for i in range(len(tbl)):
        n = names_col[i]
        name = n['primary'].as_py() if n else None
        names.append(name)
        ids.append(ids_col[i].as_py())
    
    gdf = gpd.GeoDataFrame({'station_id': ids, 'station_name': names, 'geometry': geoms}, crs='EPSG:4326')
    print(gdf)
    print(f'Geometry types: {gdf.geom_type.unique()}')
" 2>&1
Rows: 49
                              station_id  ...                     geometry
0   23e81262-d6ed-45a3-a1a0-4bc6a2a887d8  ...    POINT (-139.2728 -89.998)
1   ed7d4df0-fb65-49a7-a46e-4d3595ab8f9e  ...  POINT (-68.12217 -67.56924)
2   2921924c-7938-4ef0-9cd2-cd6ac0947c6c  ...  POINT (-67.10132 -68.13006)
3   90c7bf02-04af-423b-8f54-8ffb4bfa6c45  ...  POINT (-64.25769 -65.24551)
4   f6b7b583-191a-449b-95dc-7bd90ecddef7  ...  POINT (-64.05311 -64.77429)
5   d76b5d42-78a1-49aa-a015-be14688c29d9  ...  POINT (-58.78731 -62.22305)
6   4463ec21-3f98-4603-8174-c2c2ea68bd71  ...   POINT (-58.90385 -62.1844)
7   c38eadd2-432f-443b-a45d-0dd6f970b03a  ...   POINT (-58.95992 -62.1982)
8   06cc197e-bade-42aa-9dfc-39a687d41a78  ...   POINT (-58.96152 -62.2014)
9   e89b5561-840e-4ebc-99ca-3d748a78a60a  ...  POINT (-58.96317 -62.19985)
10  3a6a5d5a-3040-49a1-a0aa-a1c408a60146  ...  POINT (-58.96537 -62.20043)
11  1ae1d16b-e347-4085-89be-feb8f5151c50  ...  POINT (-58.96118 -62.21775)
12  3554e829-89ff-4681-942f-e361e9a93acf  ...  POINT (-59.66434 -62.47889)
13  7ed44c37-1664-42da-9e1a-fbc1774a7367  ...  POINT (-58.66701 -62.23793)
14  5cd11342-bb88-4ffb-a8cb-d12bc90635c6  ...  POINT (-58.47194 -62.15901)
15  8f17d23a-553a-4641-a5d1-e67ca1c7bacc  ...  POINT (-58.39083 -62.08424)
16  9d034b39-095a-45bf-8463-9b89102bf6a2  ...  POINT (-57.89986 -63.32083)
17  de5df6e3-3b22-468c-ba43-4d243d721c9f  ...  POINT (-57.90117 -63.32089)
18  59fb7587-704a-4a4c-8a80-4de39fc865eb  ...  POINT (-56.99717 -63.39834)
19  96ed2dba-5a05-4d96-bdbf-a162ee11b655  ...  POINT (-56.99637 -63.39806)
20  0bd9aea9-7334-4ae1-afe0-3954079e80f8  ...  POINT (-56.62769 -64.24062)
21  e2a72a14-ea5e-47c7-8f7c-303b9fd47f73  ...  POINT (-44.73769 -60.73807)
22  256f7a41-8ba5-42e3-9544-73621992f5c6  ...  POINT (-34.62745 -77.87361)
23  5a06bf03-22f9-46a0-a805-dfd7d56c54eb  ...   POINT (-26.19771 -75.6125)
24  13f83c85-ac47-43aa-a11f-248c14eb5d7e  ...   POINT (-13.4077 -73.04279)
25  76fc8784-4217-4eb7-951e-77a7fc986ec3  ...   POINT (-8.27417 -70.67444)
26  2ba5ad8b-6784-4088-87bb-50c14f2cbdc0  ...    POINT (0.31493 -79.40631)
27  01e06782-a4dc-4d9e-a850-242c94f1dbc2  ...    POINT (2.53443 -72.01198)
28  864311b8-c1ba-4818-8b15-402122495a65  ...    POINT (11.82453 -70.7766)
29  30a92d5d-700e-4501-8ad8-d7b373d07e90  ...   POINT (11.73276 -70.76741)
30  47f64194-6f2c-4cd5-bf8a-0fd5ac49d24b  ...   POINT (39.58203 -69.00424)
31  d4a35fd4-5e6c-4c00-9c36-8249179b5641  ...    POINT (62.87375 -67.6029)
32  c8b9875f-3051-4b51-bc75-e5fd03507bcd  ...   POINT (76.19533 -69.40683)
33  0471ebb0-e185-48f0-8146-ce23d4a5a931  ...   POINT (76.37175 -69.37361)
34  ad792a75-c72e-4204-8fda-a14235a2791d  ...   POINT (76.38864 -69.38006)
35  66fc254c-4bd6-4f3d-8f95-c5c0aaafa206  ...   POINT (77.11737 -80.41738)
36  61fa8848-c708-48c8-8842-817124296b41  ...   POINT (77.96837 -68.57691)
37  3a151f12-0ce5-4a2f-b17e-d5740a5b5a21  ...   POINT (93.00928 -66.55305)
38  656c3136-8b2a-4ef6-870e-e98b961e8638  ...  POINT (100.74975 -66.27459)
39  19aeddf3-edd8-456d-8171-4c902e794824  ...  POINT (106.83829 -78.46435)
40  e02d07a5-de40-4997-8062-2adecb7640d8  ...  POINT (110.52408 -66.28209)
41  42d554ba-4456-42f8-b7df-3faa71e6daf6  ...  POINT (123.33333 -75.10001)
42  ca812f6a-ae44-4d83-8c80-1d55d4b1d2f1  ...  POINT (123.34713 -75.10122)
43  81f11e7c-fc8f-4e71-8dec-40c625e64689  ...   POINT (140.0011 -66.66328)
44  a2b3c483-20d5-4044-a098-3a9eeb5e1a2b  ...  POINT (163.71527 -74.93434)
45  81ab83f2-39a1-4289-8674-2c6111c3280d  ...  POINT (164.22882 -74.62409)
46  65e16630-0264-40b3-b21f-2df6716d5c7e  ...  POINT (164.11311 -74.69439)
47  a1a1291c-4171-4768-8b8e-4df289c7ed30  ...  POINT (166.66833 -77.84833)
48  2069a892-5e6c-4b45-9659-53f0967cc370  ...  POINT (166.76834 -77.84945)

[49 rows x 3 columns]
Geometry types: <ArrowStringArray>
['Point']
Length: 1, dtype: str
8:40
Now I have all 49 stations as points. I need to:

1. Create 200km buffer around each station
2. Get land data from Overture (land) for Antarctica south of -60
3. Get water data from Overture (water) and bathymetry data
4. Clip station spheres to land for the first output
5. Compute over-water portions and intersect with water features for the second output

Let me plan the approach:

1. Download land polygons south of -60
2. Download water polygons south of -60
3. Download bathymetry polygons south of -60
4. Create station buffer spheres (200km radius) - need to use an Antarctic projection
5. Clip spheres to land -> grouped into coalitions where they overlap
6. Over-water portion intersected with water features

For projection, the standard Antarctic projection is EPSG:3031 (Antarctic Polar Stereographic) or EPSG:3976 (NSIDC Sea Ice Polar Stereographic South). Let's use EPSG:3031 (WGS 84 / Antarctic Polar Stereographic).

Let me also check the land and water data to see how much data we're dealing with.
8:40
8:40
Bash python -c "
python -c "
from overturemaps.core import record_batch_reader
import pyarrow as pa

# Check land data volume
r = record_batch_reader('land', bbox=(-180, -90, 180, -60))
if r:
    tbl = r.read_all()
    print(f'Land features: {len(tbl)}')
    subtypes = tbl.column('subtype')
    for s in subtypes.unique():
        print(f'  subtype: {s.as_py()}')
else:
    print('land failed')

r2 = record_batch_reader('water', bbox=(-180, -90, 180, -60))
if r2:
    tbl2 = r2.read_all()
    print(f'Water features: {len(tbl2)}')
    subtypes = tbl2.column('subtype')
    for s in subtypes.unique():
        print(f'  subtype: {s.as_py()}')
else:
    print('water failed')

r3 = record_batch_reader('bathymetry', bbox=(-180, -90, 180, -60))
if r3:
    tbl3 = r3.read_all()
    print(f'Bathymetry features: {len(tbl3)}')
else:
    print('bathymetry failed')
" 2>&1
Land features: 93369
  subtype: land
  subtype: rock
  subtype: physical
  subtype: glacier
  subtype: crater
  subtype: sand
  subtype: reef
  subtype: wetland
  subtype: shrub
  subtype: grass
Water features: 13500
  subtype: lake
  subtype: physical
  subtype: stream
  subtype: ocean
  subtype: human_made
  subtype: canal
  subtype: water
  subtype: pond
  subtype: river
  subtype: reservoir
Bathymetry features: 3096
11:34
Let me plan the approach:

1. **Stations**: Use `division` theme, filter to only the locality/neighborhood entries (these are the research stations). There are 49 total, the first row is Amundsen-Scott South Pole (locality) which is a station too, and Antarctica (country) at index 26 should be excluded.

2. **200 km radius**: Create buffer circles around each station point.
   - Need an appropriate projected CRS for Antarctica. The best choice is EPSG:3031 (Antarctic Polar Stereographic) which is suitable for the entire continent south of -60.

3. **Land**: From the `land` theme. We need to clip the station buffers by land, keeping only the portion that overlaps with land.

4. **Water**: From `water` and `bathymetry` themes.

5. **Coalition grouping**: Group the land-clipped station zones into coalitions where they overlap. Use `unary_union` + overlay approach.

Let me write the comprehensive script now.

The plan:
- Download stations from division theme (south of -60)
- Download land polygons from land theme (south of -60)
- Download water polygons from water theme (south of -60)
- Download bathymetry from bathymetry theme (south of -60)
- Project to EPSG:3031 (Antarctic Polar Stereographic)
- Create 200km buffers around each station
- Clip buffers by land polygons → station spheres (land-clipped)
- From this, dissolve overlapping ones into coalitions
- Also create the water overlap: intersect each station's buffer with water features, attributing with water info

Let me think about the coalition part more carefully. The requirement says:
"the land-clipped station zones grouped into coalitions wherever they overlap. Each coalition gets an integer coalition id"

So the process is:
1. Create 200km buffers around each station
2. Clip each buffer by land (keep only the part overlapping land)
3. Where these land-clipped buffers overlap/touch, they form a coalition
4. Assign a coalition id to each feature

Each feature also needs `station_id` and `station_name`.

For the water overlap:
- Take each station's 200km buffer (full circle, not land-clipped)
- Intersect with water features
- Keep the intersection parts (over water)
- Attribute with station_id, station_name, water_id, water_name, water_subtype, water_source

Let me write this step by step.
11:34
11:34
Write /work/solve.py
content · 352 lines · py
"""
Cross-station logistics-overlap maps for Antarctic Treaty consultative meeting.

Produces two GeoParquet files:
  1. station_spheres.geoparquet  — land-clipped station zones grouped into coalitions
  2. station_water_overlap.geoparquet — per-station over-water intersections with water attribution
"""

import sys
import time
import traceback

import pyarrow as pa
import pyarrow.compute as pc
import geopandas as gpd
import pandas as pd
from shapely import wkb, wkt
from shapely.geometry import box, Point, MultiPolygon
from shapely.ops import unary_union
from overturemaps.core import record_batch_reader

# ---------------------------------------------------------------------------
# 1.  Helper: retry wrapper for Overture downloads
# ---------------------------------------------------------------------------
def fetch_overture(overture_type, bbox=(-180, -90, 180, -60), max_retries=3):
    """Download an Overture theme within a bounding box, return a GeoDataFrame."""
    for attempt in range(1, max_retries + 1):
        try:
            reader = record_batch_reader(overture_type, bbox=bbox, request_timeout=120)
            if reader is None:
                raise RuntimeError(f"record_batch_reader returned None for {overture_type}")
            table = reader.read_all()
            print(f"  {overture_type}: {len(table)} features")
            if len(table) == 0:
                return gpd.GeoDataFrame({"geometry": []}, crs="EPSG:4326")

            # Convert WKB geometry column to shapely objects
            geoms = []
            for i in range(len(table)):
                gb = table.column("geometry")[i].as_py()
                if gb is not None:
                    geoms.append(wkb.loads(gb))
                else:
                    geoms.append(None)

            # Build a dict of column arrays
            data = {}
            for field_name in table.schema.names:
                if field_name == "geometry":
                    continue
                col = table.column(field_name)
                data[field_name] = [col[i].as_py() for i in range(len(table))]

            gdf = gpd.GeoDataFrame(data, geometry=geoms, crs="EPSG:4326")
            return gdf

        except Exception as exc:
            print(f"    Attempt {attempt} failed: {exc}")
            if attempt < max_retries:
                time.sleep(2 * attempt)
            else:
                raise

# ---------------------------------------------------------------------------
# 2.  Fetch data
# ---------------------------------------------------------------------------
print("=== Fetching data ===")

print("Fetching divisions (research stations) ...")
divisions = fetch_overture("division", bbox=(-180, -90, 180, -60))

print("Fetching land...")
land_raw = fetch_overture("land", bbox=(-180, -90, 180, -60))

print("Fetching water...")
water_raw = fetch_overture("water", bbox=(-180, -90, 180, -60))

print("Fetching bathymetry...")
bathy_raw = fetch_overture("bathymetry", bbox=(-180, -90, 180, -60))

# ---------------------------------------------------------------------------
# 3.  Filter stations — keep only locality/neighborhood (research stations)
# ---------------------------------------------------------------------------
print("\n=== Processing stations ===")
print(f"Total divisions: {len(divisions)}")

# The 'subtype' column tells us what kind of place it is
# Keep locality and neighborhood subtypes (exclude 'country')
stations = divisions[divisions["subtype"].isin(["locality", "neighborhood"])].copy()
print(f"Station candidates: {len(stations)}")

# Extract station name from names.primary
def extract_name(names_val):
    if names_val and isinstance(names_val, dict) and "primary" in names_val:
        return names_val["primary"]
    return None

stations["station_name"] = stations["names"].apply(extract_name)
stations["station_id"] = stations["id"].astype(str)

# Drop Antarctica country entry by checking station_name
stations = stations[stations["station_name"].notna()].copy()

# Filter out Antarctica itself (the country entry)
stations = stations[~stations["station_name"].str.lower().isin(["antarctica"])].copy()

# Also filter points that are actually south of -60 (some may be questionable)
stations = stations[stations.geometry.y <= -60].copy()

print(f"Final station count: {len(stations)}")
for idx, row in stations.iterrows():
    print(f"  {row['station_name']} @ ({row.geometry.x:.4f}, {row.geometry.y:.4f})")

# ---------------------------------------------------------------------------
# 4.  Project to EPSG:3031 (Antarctic Polar Stereographic)
# ---------------------------------------------------------------------------
print("\n=== Projecting to EPSG:3031 ===")
stations = stations.to_crs("EPSG:3031")
print(f"Stations CRS: {stations.crs}")

# ---------------------------------------------------------------------------
# 5.  Create 200 km buffers
# ---------------------------------------------------------------------------
print("\n=== Creating 200 km buffers ===")
BUFFER_DIST = 200_000  # meters = 200 km
stations["buffer"] = stations.geometry.buffer(BUFFER_DIST)
print("Buffers created.")

# ---------------------------------------------------------------------------
# 6.  Process land — dissolve into a single land mask
# ---------------------------------------------------------------------------
print("\n=== Processing land ===")
# Keep only the geometry, dissolve
if len(land_raw) > 0:
    land_gdf = land_raw.to_crs("EPSG:3031")
    # Dissolve all land polygons into a single multipolygon
    land_union = unary_union(land_gdf.geometry.values)
    print(f"Land union type: {land_union.geom_type if land_union else 'None'}")
else:
    land_union = None
    print("WARNING: No land features found!")

# ---------------------------------------------------------------------------
# 7.  Clip station buffers by land → station spheres
# ---------------------------------------------------------------------------
print("\n=== Clipping station buffers to land ===")
clipped_polys = []
for idx, row in stations.iterrows():
    buf = row["buffer"]
    if land_union is not None and not land_union.is_empty:
        clipped = buf.intersection(land_union)
    else:
        clipped = buf  # no land data, keep full buffer

    if clipped.is_empty:
        continue

    # Ensure MultiPolygon
    if clipped.geom_type == "Polygon":
        clipped = MultiPolygon([clipped])
    elif clipped.geom_type != "MultiPolygon":
        # Skip weird geometry types
        continue

    clipped_polys.append({
        "station_id": row["station_id"],
        "station_name": row["station_name"],
        "geometry": clipped
    })

spheres_gdf = gpd.GeoDataFrame(clipped_polys, crs="EPSG:3031")
print(f"Land-clipped spheres: {len(spheres_gdf)}")

# ---------------------------------------------------------------------------
# 8.  Group into coalitions where they overlap
# ---------------------------------------------------------------------------
print("\n=== Grouping into coalitions ===")

# Spatial join to find overlapping pairs
if len(spheres_gdf) > 0:
    # Self-join to find overlaps
    sj = gpd.sjoin(spheres_gdf, spheres_gdf, how="inner", predicate="intersects")
    # Build a graph of overlapping indices
    import collections
    graph = collections.defaultdict(set)
    for _, row in sj.iterrows():
        i = row.index_left
        j = row.index_right
        if i != j:
            graph[i].add(j)
            graph[j].add(i)

    # Find connected components (coalitions)
    visited = set()
    coalitions = []
    for node in graph:
        if node in visited:
            continue
        stack = [node]
        comp = set()
        while stack:
            v = stack.pop()
            if v in visited:
                continue
            visited.add(v)
            comp.add(v)
            for nb in graph[v]:
                if nb not in visited:
                    stack.append(nb)
        coalitions.append(comp)

    # Also include isolated stations (no overlaps)
    all_indices = set(spheres_gdf.index)
    isolated = all_indices - visited
    for idx in isolated:
        coalitions.append({idx})

    # Assign coalition IDs
    spheres_gdf["coalition"] = -1
    for cid, members in enumerate(coalitions):
        for idx in members:
            spheres_gdf.at[idx, "coalition"] = cid

    # Check: more than one distinct coalition value
    distinct = spheres_gdf["coalition"].nunique()
    print(f"Coalitions formed: {len(coalitions)}, distinct coalition ids: {distinct}")
    if distinct < 2:
        print("WARNING: fewer than 2 distinct coalition IDs — forcing a second group")
        if len(spheres_gdf) > 1:
            # Split the first coalition arbitrarily to get 2+ groups
            # Group by station proximity or just assign sequential
            pass  # The logic above should handle this naturally

else:
    spheres_gdf["coalition"] = -1

print("Coalition counts:")
print(spheres_gdf["coalition"].value_counts().sort_index())

# Sort by coalition id for readability
spheres_gdf = spheres_gdf.sort_values("coalition").reset_index(drop=True)

# ---------------------------------------------------------------------------
# 9.  Write station_spheres.geoparquet
# ---------------------------------------------------------------------------
print("\n=== Writing station_spheres.geoparquet ===")
keep_cols = ["station_id", "station_name", "coalition", "geometry"]
spheres_out = spheres_gdf[keep_cols].copy()
spheres_out.to_parquet("/work/station_spheres.geoparquet", index=False)
print(f"Written {len(spheres_out)} features.")

# ---------------------------------------------------------------------------
# 10. Water overlap — per-station over-water portion
# ---------------------------------------------------------------------------
print("\n=== Computing water overlaps ===")

# Prepare water features
def prep_water(gdf, source_name):
    """Extract key columns and project."""
    if len(gdf) == 0:
        return gpd.GeoDataFrame({"geometry": []}, crs="EPSG:4326")
    gdf = gdf.to_crs("EPSG:3031")

    def extract_name(names_val):
        if names_val and isinstance(names_val, dict):
            return names_val.get("primary", None)
        return None

    records = []
    for idx, row in gdf.iterrows():
        records.append({
            "water_id": str(row.get("id", "")),
            "water_name": extract_name(row.get("names")),
            "water_subtype": row.get("subtype", ""),
            "water_source": source_name,
            "geometry": row.geometry
        })
    result = gpd.GeoDataFrame(records, crs="EPSG:3031")
    return result

water_prepped = prep_water(water_raw, "base.water")
bathy_prepped = prep_water(bathy_raw, "base.bathymetry")

# Combine
all_water = gpd.GeoDataFrame(
    pd.concat([water_prepped, bathy_prepped], ignore_index=True),
    crs="EPSG:3031"
)
print(f"Combined water features: {len(all_water)}")

# For each station's buffer, intersect with water features
water_overlap_rows = []
for idx, row in stations.iterrows():
    buf = row["buffer"]
    station_id = row["station_id"]
    station_name = row["station_name"]

    # Find water features that intersect this buffer
    if len(all_water) > 0:
        # Spatial subset
        water_sub = all_water[all_water.intersects(buf)].copy()
        if len(water_sub) == 0:
            continue
        for w_idx, w_row in water_sub.iterrows():
            inter = buf.intersection(w_row.geometry)
            if inter.is_empty:
                continue
            if inter.geom_type == "Polygon":
                inter = MultiPolygon([inter])
            elif inter.geom_type != "MultiPolygon":
                continue
            water_overlap_rows.append({
                "station_id": station_id,
                "station_name": station_name,
                "water_id": w_row["water_id"],
                "water_name": w_row["water_name"],
                "water_subtype": w_row["water_subtype"],
                "water_source": w_row["water_source"],
                "geometry": inter
            })

water_overlap_gdf = gpd.GeoDataFrame(water_overlap_rows, crs="EPSG:3031")
print(f"Water overlap features: {len(water_overlap_gdf)}")

# ---------------------------------------------------------------------------
# 11. Write station_water_overlap.geoparquet
# ---------------------------------------------------------------------------
print("\n=== Writing station_water_overlap.geoparquet ===")
wo_cols = ["station_id", "station_name", "water_id", "water_name",
           "water_subtype", "water_source", "geometry"]
water_out = water_overlap_gdf[wo_cols].copy()
water_out.to_parquet("/work/station_water_overlap.geoparquet", index=False)
print(f"Written {len(water_out)} features.")

# ---------------------------------------------------------------------------
# 12. Sanity checks
# ---------------------------------------------------------------------------
print("\n=== Final sanity checks ===")

# Read back and verify
s1 = gpd.read_parquet("/work/station_spheres.geoparquet")
print(f"station_spheres.geoparquet: {len(s1)} features, CRS={s1.crs}")
print(f"  Columns: {list(s1.columns)}")
print(f"  Coalition distinct values: {s1['coalition'].nunique()}")
print(f"  Geometry types: {s1.geom_type.unique()}")

s2 = gpd.read_parquet("/work/station_water_overlap.geoparquet")
print(f"station_water_overlap.geoparquet: {len(s2)} features, CRS={s2.crs}")
print(f"  Columns: {list(s2.columns)}")
print(f"  water_source values: {s2['water_source'].unique()}")

print("\nDone!")
Wrote /work/solve.py (13592 chars).
11:39
 
11:39
Bash cd /work && python solve.py 2>&1
=== Fetching data ===
Fetching divisions (research stations) ...
  division: 49 features
Fetching land...
  land: 93369 features
Fetching water...
  water: 13500 features
Fetching bathymetry...
  bathymetry: 3096 features

=== Processing stations ===
Total divisions: 49
Station candidates: 48
Final station count: 48
  Amundsen–Scott South Pole @ (-139.2728, -89.9980)
  Rothera Research Station @ (-68.1222, -67.5692)
  Base Antártica San Martín @ (-67.1013, -68.1301)
  Vernadsky Research Base @ (-64.2577, -65.2455)
  Palmer Station @ (-64.0531, -64.7743)
  남극세종과학기지 @ (-58.7873, -62.2230)
  Base Artigas @ (-58.9039, -62.1844)
  Беллинсгаузен @ (-58.9599, -62.1982)
  Base Profesor Julio Escudero @ (-58.9615, -62.2014)
  Base Presidente Eduardo Frei Montalva @ (-58.9632, -62.1998)
  Villa Las Estrellas @ (-58.9654, -62.2004)
  长城站 @ (-58.9612, -62.2177)
  Base Naval Antartica Arturo Prat @ (-59.6643, -62.4789)
  Base Carlini @ (-58.6670, -62.2379)
  Arctowski @ (-58.4719, -62.1590)
  Estação Antártica Comandante Ferraz @ (-58.3908, -62.0842)
  Base Bernardo O’Higgins @ (-57.8999, -63.3208)
  Deutsche Antarktis-Empfangsstation O'Higgins @ (-57.9012, -63.3209)
  Fortín Sargento Cabral @ (-56.9972, -63.3983)
  Base Esperanza @ (-56.9964, -63.3981)
  Base Marambio @ (-56.6277, -64.2406)
  Base Antártica Orcadas @ (-44.7377, -60.7381)
  Base Antártica Belgrano II @ (-34.6275, -77.8736)
  Halley VI Research Station @ (-26.1977, -75.6125)
  Nordenskiöld Base @ (-13.4077, -73.0428)
  Neumayer-Station III @ (-8.2742, -70.6744)
  Troll @ (2.5344, -72.0120)
  Новолазаревская @ (11.8245, -70.7766)
  Maitri Station @ (11.7328, -70.7674)
  昭和基地 @ (39.5820, -69.0042)
  Mawson Station @ (62.8738, -67.6029)
  Bharati Research Station @ (76.1953, -69.4068)
  中山站 @ (76.3717, -69.3736)
  Прогресс @ (76.3886, -69.3801)
  昆仑站 @ (77.1174, -80.4174)
  Davis Station @ (77.9684, -68.5769)
  Мирный @ (93.0093, -66.5530)
  Stacja im. A.B. Dobrowolskiego @ (100.7497, -66.2746)
  Восток @ (106.8383, -78.4643)
  Casey Station @ (110.5241, -66.2821)
  Concordia Station @ (123.3333, -75.1000)
  Camp d'été @ (123.3471, -75.1012)
  Base Dumont d'Urville @ (140.0011, -66.6633)
  秦岭站 @ (163.7153, -74.9343)
  남극장보고과학기지 @ (164.2288, -74.6241)
  Stazione Mario Zucchelli @ (164.1131, -74.6944)
  McMurdo Station @ (166.6683, -77.8483)
  Scott Base @ (166.7683, -77.8495)

=== Projecting to EPSG:3031 ===
Stations CRS: EPSG:3031

=== Creating 200 km buffers ===
Buffers created.

=== Processing land ===
Land union type: GeometryCollection

=== Clipping station buffers to land ===
Land-clipped spheres: 16

=== Grouping into coalitions ===
Traceback (most recent call last):
  File "/work/solve.py", line 187, in <module>
    i = row.index_left
        ^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.14/site-packages/pandas/core/generic.py", line 6206, in __getattr__
    return object.__getattribute__(self, name)
           ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
AttributeError: 'Series' object has no attribute 'index_left'. Did you mean: 'index_right'?
17:12
The issue is that the `sjoin` result has a named index. Let me check the column names. The sjoin returns columns `index_left` and `index_right` as the index names, or as actual columns. Let me fix this.
17:12
Read /work/solve.py
   175	# 8.  Group into coalitions where they overlap
   176	# ---------------------------------------------------------------------------
   177	print("\n=== Grouping into coalitions ===")
   178	
   179	# Spatial join to find overlapping pairs
   180	if len(spheres_gdf) > 0:
   181	    # Self-join to find overlaps
   182	    sj = gpd.sjoin(spheres_gdf, spheres_gdf, how="inner", predicate="intersects")
   183	    # Build a graph of overlapping indices
   184	    import collections
   185	    graph = collections.defaultdict(set)
   186	    for _, row in sj.iterrows():
   187	        i = row.index_left
   188	        j = row.index_right
   189	        if i != j:
   190	            graph[i].add(j)
   191	            graph[j].add(i)
   192	
   193	    # Find connected components (coalitions)
   194	    visited = set()
   195	    coalitions = []
   196	    for node in graph:
   197	        if node in visited:
   198	            continue
   199	        stack = [node]
<system-reminder>Showed lines 175-199 of 352. Re-call Read with offset=200 to continue, or raise limit.</system-reminder>
17:17
The issue is that sjoin returns a DataFrame with `index_left` and `index_right` when using `sjoin()` with the modern geopandas. Let me check what the actual index names are. The error says 'Series' object has no attribute 'index_left'. It's possible that the index columns are stored differently. Let me check the column names returned by sjoin.
17:17
Bash cd /work && python -c "
cd /work && python -c "
import geopandas as gpd
# Quick test
s1 = gpd.read_parquet('station_spheres.geoparquet') if False else None
# Test sjoin column names
from shapely.geometry import Point
import pandas as pd
gdf1 = gpd.GeoDataFrame({'a': [1,2]}, geometry=[Point(0,0), Point(1,1)], crs='EPSG:3031')
gdf2 = gpd.GeoDataFrame({'b': [3,4]}, geometry=[Point(0.1,0.1), Point(2,2)], crs='EPSG:3031')
sj = gpd.sjoin(gdf1, gdf2, how='inner', predicate='intersects')
print('Columns:', list(sj.columns))
print(sj)
"
Columns: ['a', 'geometry', 'index_right', 'b']
Empty GeoDataFrame
Columns: [a, geometry, index_right, b]
Index: []
17:25
The sjoin result has `index_left` (the index of the left gdf) and `index_right` columns. Let me fix the code.
17:25
Edit /work/solve.py
Edited /work/solve.py.
17:31
Wait, `row.name` won't work because `iterrows()` gives (index, series) and the series name is the index. Let me think about this.

When you call `gpd.sjoin(gdf, gdf, ...)`, the result has the index from the left dataframe, and a column `index_right` from the right dataframe. So when iterating:

```python
for idx, row in sj.iterrows():
    i = idx  # left index
    j = row["index_right"]  # right index
```

That's the fix.
17:31
Edit /work/solve.py
Edited /work/solve.py.
17:36
The land union returned a GeometryCollection, not a nice Polygon/MultiPolygon. That's because the land data has many geometry types. Let me also fix that and re-run.
17:36
17:36
Read /work/solve.py
   105	stations = stations[~stations["station_name"].str.lower().isin(["antarctica"])].copy()
   106	
   107	# Also filter points that are actually south of -60 (some may be questionable)
   108	stations = stations[stations.geometry.y <= -60].copy()
   109	
   110	print(f"Final station count: {len(stations)}")
   111	for idx, row in stations.iterrows():
   112	    print(f"  {row['station_name']} @ ({row.geometry.x:.4f}, {row.geometry.y:.4f})")
   113	
   114	# ---------------------------------------------------------------------------
   115	# 4.  Project to EPSG:3031 (Antarctic Polar Stereographic)
   116	# ---------------------------------------------------------------------------
   117	print("\n=== Projecting to EPSG:3031 ===")
   118	stations = stations.to_crs("EPSG:3031")
   119	print(f"Stations CRS: {stations.crs}")
   120	
   121	# ---------------------------------------------------------------------------
   122	# 5.  Create 200 km buffers
   123	# ---------------------------------------------------------------------------
   124	print("\n=== Creating 200 km buffers ===")
   125	BUFFER_DIST = 200_000  # meters = 200 km
   126	stations["buffer"] = stations.geometry.buffer(BUFFER_DIST)
   127	print("Buffers created.")
   128	
   129	# ---------------------------------------------------------------------------
   130	# 6.  Process land — dissolve into a single land mask
   131	# ---------------------------------------------------------------------------
   132	print("\n=== Processing land ===")
   133	# Keep only the geometry, dissolve
   134	if len(land_raw) > 0:
   135	    land_gdf = land_raw.to_crs("EPSG:3031")
   136	    # Dissolve all land polygons into a single multipolygon
   137	    land_union = unary_union(land_gdf.geometry.values)
   138	    print(f"Land union type: {land_union.geom_type if land_union else 'None'}")
   139	else:
   140	    land_union = None
   141	    print("WARNING: No land features found!")
   142	
   143	# ---------------------------------------------------------------------------
   144	# 7.  Clip station buffers by land → station spheres
   145	# ---------------------------------------------------------------------------
   146	print("\n=== Clipping station buffers to land ===")
   147	clipped_polys = []
   148	for idx, row in stations.iterrows():
   149	    buf = row["buffer"]
   150	    if land_union is not None and not land_union.is_empty:
   151	        clipped = buf.intersection(land_union)
   152	    else:
   153	        clipped = buf  # no land data, keep full buffer
   154	
<system-reminder>Showed lines 105-154 of 352. Re-call Read with offset=155 to continue, or raise limit.</system-reminder>
17:43
When the land union is a GeometryCollection, I need to extract only the Polygon/MultiPolygon parts to use it as a clipping mask. Let me fix the land processing to handle this.
17:43
Edit /work/solve.py
Edited /work/solve.py.
17:49
Now let me also think about a key issue. The Antarctic land mass is basically the entire continent. When we clip station buffers to land, we're getting the portion of each 200km buffer that lies on land. But since Antarctica is a big land mass, most buffers will simply be clipped to the land area that overlaps them. But we also need to consider that the buffers around the coast extend out over water - we want the land-clipped portion to be just the part on land.

Wait, actually the land features from Overture include things like glaciers, rock, etc. The Antarctic continent as a land mass should be covered. Let me think about this more carefully.

The land union should be the Antarctic continent. Buffers from coastal stations extend over water. The intersection of buffer with land gives the on-land portion.

For the water overlap (output 2), we want the portion of the buffer that's over water features. So it's buffer ∩ (water ∪ bathymetry).

Let me also think about the GeometryCollection issue - the land union may include point/line geometries from the Overture land layer. We need to handle that.

Let me also consider that the water features include both "ocean" subtype water and other water types. And bathymetry is separate.

Let me re-run the script.
17:49
Bash cd /work && python solve.py 2>&1
=== Fetching data ===
Fetching divisions (research stations) ...
  division: 49 features
Fetching land...
  land: 93369 features
Fetching water...
  water: 13500 features
Fetching bathymetry...
  bathymetry: 3096 features

=== Processing stations ===
Total divisions: 49
Station candidates: 48
Final station count: 48
  Amundsen–Scott South Pole @ (-139.2728, -89.9980)
  Rothera Research Station @ (-68.1222, -67.5692)
  Base Antártica San Martín @ (-67.1013, -68.1301)
  Vernadsky Research Base @ (-64.2577, -65.2455)
  Palmer Station @ (-64.0531, -64.7743)
  남극세종과학기지 @ (-58.7873, -62.2230)
  Base Artigas @ (-58.9039, -62.1844)
  Беллинсгаузен @ (-58.9599, -62.1982)
  Base Profesor Julio Escudero @ (-58.9615, -62.2014)
  Base Presidente Eduardo Frei Montalva @ (-58.9632, -62.1998)
  Villa Las Estrellas @ (-58.9654, -62.2004)
  长城站 @ (-58.9612, -62.2177)
  Base Naval Antartica Arturo Prat @ (-59.6643, -62.4789)
  Base Carlini @ (-58.6670, -62.2379)
  Arctowski @ (-58.4719, -62.1590)
  Estação Antártica Comandante Ferraz @ (-58.3908, -62.0842)
  Base Bernardo O’Higgins @ (-57.8999, -63.3208)
  Deutsche Antarktis-Empfangsstation O'Higgins @ (-57.9012, -63.3209)
  Fortín Sargento Cabral @ (-56.9972, -63.3983)
  Base Esperanza @ (-56.9964, -63.3981)
  Base Marambio @ (-56.6277, -64.2406)
  Base Antártica Orcadas @ (-44.7377, -60.7381)
  Base Antártica Belgrano II @ (-34.6275, -77.8736)
  Halley VI Research Station @ (-26.1977, -75.6125)
  Nordenskiöld Base @ (-13.4077, -73.0428)
  Neumayer-Station III @ (-8.2742, -70.6744)
  Troll @ (2.5344, -72.0120)
  Новолазаревская @ (11.8245, -70.7766)
  Maitri Station @ (11.7328, -70.7674)
  昭和基地 @ (39.5820, -69.0042)
  Mawson Station @ (62.8738, -67.6029)
  Bharati Research Station @ (76.1953, -69.4068)
  中山站 @ (76.3717, -69.3736)
  Прогресс @ (76.3886, -69.3801)
  昆仑站 @ (77.1174, -80.4174)
  Davis Station @ (77.9684, -68.5769)
  Мирный @ (93.0093, -66.5530)
  Stacja im. A.B. Dobrowolskiego @ (100.7497, -66.2746)
  Восток @ (106.8383, -78.4643)
  Casey Station @ (110.5241, -66.2821)
  Concordia Station @ (123.3333, -75.1000)
  Camp d'été @ (123.3471, -75.1012)
  Base Dumont d'Urville @ (140.0011, -66.6633)
  秦岭站 @ (163.7153, -74.9343)
  남극장보고과학기지 @ (164.2288, -74.6241)
  Stazione Mario Zucchelli @ (164.1131, -74.6944)
  McMurdo Station @ (166.6683, -77.8483)
  Scott Base @ (166.7683, -77.8495)

=== Projecting to EPSG:3031 ===
Stations CRS: EPSG:3031

=== Creating 200 km buffers ===
Buffers created.

=== Processing land ===
Land union type: MultiPolygon

=== Clipping station buffers to land ===
Land-clipped spheres: 48

=== Grouping into coalitions ===
Coalitions formed: 16, distinct coalition ids: 16
Coalition counts:
coalition
0     20
1      2
2      2
3      3
4      4
5      2
6      2
7      5
8      1
9      1
10     1
11     1
12     1
13     1
14     1
15     1
Name: count, dtype: int64

=== Writing station_spheres.geoparquet ===
Written 48 features.

=== Computing water overlaps ===
Combined water features: 16596
Water overlap features: 14212

=== Writing station_water_overlap.geoparquet ===
Written 14212 features.

=== Final sanity checks ===
station_spheres.geoparquet: 48 features, CRS={"$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "ProjectedCRS", "name": "WGS 84 / Antarctic Polar Stereographic", "base_crs": {"name": "WGS 84", "datum_ensemble": {"name": "World Geodetic System 1984 ensemble", "members": [{"name": "World Geodetic System 1984 (Transit)"}, {"name": "World Geodetic System 1984 (G730)"}, {"name": "World Geodetic System 1984 (G873)"}, {"name": "World Geodetic System 1984 (G1150)"}, {"name": "World Geodetic System 1984 (G1674)"}, {"name": "World Geodetic System 1984 (G1762)"}, {"name": "World Geodetic System 1984 (G2139)"}, {"name": "World Geodetic System 1984 (G2296)"}], "ellipsoid": {"name": "WGS 84", "semi_major_axis": 6378137, "inverse_flattening": 298.257223563}, "accuracy": "2.0", "id": {"authority": "EPSG", "code": 6326}}, "coordinate_system": {"subtype": "ellipsoidal", "axis": [{"name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree"}, {"name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree"}]}, "id": {"authority": "EPSG", "code": 4326}}, "conversion": {"name": "Antarctic Polar Stereographic", "method": {"name": "Polar Stereographic (variant B)", "id": {"authority": "EPSG", "code": 9829}}, "parameters": [{"name": "Latitude of standard parallel", "value": -71, "unit": "degree", "id": {"authority": "EPSG", "code": 8832}}, {"name": "Longitude of origin", "value": 0, "unit": "degree", "id": {"authority": "EPSG", "code": 8833}}, {"name": "False easting", "value": 0, "unit": "metre", "id": {"authority": "EPSG", "code": 8806}}, {"name": "False northing", "value": 0, "unit": "metre", "id": {"authority": "EPSG", "code": 8807}}]}, "coordinate_system": {"subtype": "Cartesian", "axis": [{"name": "Easting", "abbreviation": "E", "direction": "north", "meridian": {"longitude": 90}, "unit": "metre"}, {"name": "Northing", "abbreviation": "N", "direction": "north", "meridian": {"longitude": 0}, "unit": "metre"}]}, "scope": "Antarctic Digital Database and small scale topographic mapping.", "area": "Antarctica.", "bbox": {"south_latitude": -90, "west_longitude": -180, "north_latitude": -60, "east_longitude": 180}, "id": {"authority": "EPSG", "code": 3031}}
  Columns: ['station_id', 'station_name', 'coalition', 'geometry']
  Coalition distinct values: 16
  Geometry types: <ArrowStringArray>
['MultiPolygon']
Length: 1, dtype: str
station_water_overlap.geoparquet: 14212 features, CRS={"$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "ProjectedCRS", "name": "WGS 84 / Antarctic Polar Stereographic", "base_crs": {"name": "WGS 84", "datum_ensemble": {"name": "World Geodetic System 1984 ensemble", "members": [{"name": "World Geodetic System 1984 (Transit)"}, {"name": "World Geodetic System 1984 (G730)"}, {"name": "World Geodetic System 1984 (G873)"}, {"name": "World Geodetic System 1984 (G1150)"}, {"name": "World Geodetic System 1984 (G1674)"}, {"name": "World Geodetic System 1984 (G1762)"}, {"name": "World Geodetic System 1984 (G2139)"}, {"name": "World Geodetic System 1984 (G2296)"}], "ellipsoid": {"name": "WGS 84", "semi_major_axis": 6378137, "inverse_flattening": 298.257223563}, "accuracy": "2.0", "id": {"authority": "EPSG", "code": 6326}}, "coordinate_system": {"subtype": "ellipsoidal", "axis": [{"name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree"}, {"name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree"}]}, "id": {"authority": "EPSG", "code": 4326}}, "conversion": {"name": "Antarctic Polar Stereographic", "method": {"name": "Polar Stereographic (variant B)", "id": {"authority": "EPSG", "code": 9829}}, "parameters": [{"name": "Latitude of standard parallel", "value": -71, "unit": "degree", "id": {"authority": "EPSG", "code": 8832}}, {"name": "Longitude of origin", "value": 0, "unit": "degree", "id": {"authority": "EPSG", "code": 8833}}, {"name": "False easting", "value": 0, "unit": "metre", "id": {"authority": "EPSG", "code": 8806}}, {"name": "False northing", "value": 0, "unit": "metre", "id": {"authority": "EPSG", "code": 8807}}]}, "coordinate_system": {"subtype": "Cartesian", "axis": [{"name": "Easting", "abbreviation": "E", "direction": "north", "meridian": {"longitude": 90}, "unit": "metre"}, {"name": "Northing", "abbreviation": "N", "direction": "north", "meridian": {"longitude": 0}, "unit": "metre"}]}, "scope": "Antarctic Digital Database and small scale topographic mapping.", "area": "Antarctica.", "bbox": {"south_latitude": -90, "west_longitude": -180, "north_latitude": -60, "east_longitude": 180}, "id": {"authority": "EPSG", "code": 3031}}
  Columns: ['station_id', 'station_name', 'water_id', 'water_name', 'water_subtype', 'water_source', 'geometry']
  water_source values: <ArrowStringArray>
['base.bathymetry', 'base.water']
Length: 2, dtype: str

Done!
20:54
The outputs look good! Let me verify the output files exist and do some more sanity checks:

1. `station_spheres.geoparquet` - 48 features, CRS EPSG:3031, columns: station_id, station_name, coalition, geometry (MultiPolygon). 16 distinct coalition IDs - more than 1, ✓
2. `station_water_overlap.geoparquet` - 14212 features, CRS EPSG:3031, columns: station_id, station_name, water_id, water_name, water_subtype, water_source, geometry (MultiPolygon). water_source has both 'base.bathymetry' and 'base.water' ✓

Let me verify the files exist and do a quick spot check on the data.
20:54
20:54
Bash ls -lh /work/station_spheres.geoparquet /work/station_water_overlap.geoparquet
-rw-r--r-- 1 agent agent 31M Jun 18 01:45 /work/station_spheres.geoparquet
-rw-r--r-- 1 agent agent 48M Jun 18 01:45 /work/station_water_overlap.geoparquet
21:01
Let me verify the outputs more carefully:

1. `station_spheres.geoparquet` - has `station_id`, `station_name`, `coalition`, geometry with MultiPolygon type
   - coalition has 16 distinct values (>1 ✓)
   - CRS is EPSG:3031 ✓
   - 48 features ✓

2. `station_water_overlap.geoparquet` - has `station_id`, `station_name`, `water_id`, `water_name`, `water_subtype`, `water_source`, geometry with MultiPolygon type
   - water_source values are `base.water` and `base.bathymetry` ✓
   - CRS is EPSG:3031 ✓

Let me do a quick spot check on a few stations to make sure the data looks right.
21:01
21:01
Bash cd /work && python -c "
cd /work && python -c "
import geopandas as gpd

s1 = gpd.read_parquet('station_spheres.geoparquet')
print('=== station_spheres sample ===')
print(s1.head(10).to_string())
print()

s2 = gpd.read_parquet('station_water_overlap.geoparquet')
print('=== station_water_overlap sample ===')
print(s2.head(10).to_string())
print()

# Check specific station
for stn in ['McMurdo Station', 'Palmer Station', 'Base Esperanza']:
    sub = s2[s2['station_name'] == stn]
    print(f'{stn}: {len(sub)} water overlap features')
    if len(sub) > 0:
        print(f'  water_source values: {sub[\"water_source\"].unique()}')
        print(f'  water_subtype values: {sub[\"water_subtype\"].unique()}')
"
=== station_spheres sample ===
                             station_id                           station_name  coalition                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
[... truncated ...]6129.243, -94421.13 176219.574, -76678.469 184611.227, -58198.718 191223.388, -39159.847 195992.377, -19745.21 198872.266, -141.782 199835.321, 19461.646 198872.266, 38876.282 195992.377, 57915.153 191223.388, 76394.904 184611.227, 94137.565 176219.574, 110972.264 166129.243, 126736.874 154437.412, 141279.574 141256.677, 154460.308 126713.978, 166152.14 110949.368, 176242.471 94114.668, 184634.124 76372.007, 191246.285 57892.256, 196015.274 38853.385, 198895.163 19438.749, 199858.218 -164.679, 198895.163 -19768.107)))
2  23e81262-d6ed-45a3-a1a0-4bc6a2a887d8  Amundsen–Scott South Pole  d1548a3a-2bc5-502a-bd2d-dd985969e9dd        NaN                base.bathymetry  MULTIPOLYGON (((198895.163 -19768.107, 196015.274 -39182.743, 191246.285 -58221.614, 184634.124 -76701.365, 176242.471 -94444.026, 166152.14 -111278.726, 154460.308 -127043.336, 141279.574 -141586.035, 126736.874 -154766.77, 110972.264 -166458.601, 94137.565 -176548.932, 85482.349 -180642.544, 93589.026 -140112.009, 84187.457 -56269.591, 50594.837 -4989.799, 15194.438 8119.344, 161.518 389.831, -161.755 390.597, -15073.829 8058.316, -50189.075 -4940.835, -83515.863 -55799.373, -92853.525 -138957.74, -84393.081 -181291.846, -94421.13 -176548.932, -111255.829 -166458.601, -127020.439 -154766.77, -141563.139 -141586.035, -154743.873 -127043.336, -166435.705 -111278.726, -176526.035 -94444.026, -184917.689 -76701.365, -191529.85 -58221.614, -196298.838 -39182.743, -199178.728 -19768.107, -200141.782 -164.679, -199178.728 19438.749, -196298.838 38853.385, -191529.85 57892.256, -184917.689 76372.007, -176526.035 94114.668, -166435.705 110949.368, -154743.873 126713.978, -141563.139 141256.677, -127020.439 154437.412, -111255.829 166129.243, -94421.13 176219.574, -76678.469 184611.227, -58198.718 191223.388, -39159.847 195992.377, -19745.21 198872.266, -141.782 199835.321, 19461.646 198872.266, 38876.282 195992.377, 57915.153 191223.388, 76394.904 184611.227, 94137.565 176219.574, 110972.264 166129.243, 126736.874 154437.412, 141279.574 141256.677, 154460.308 126713.978, 166152.14 110949.368, 176242.471 94114.668, 184634.124 76372.007, 191246.285 57892.256, 196015.274 38853.385, 198895.163 19438.749, 199858.218 -164.679, 198895.163 -19768.107)))
3  23e81262-d6ed-45a3-a1a0-4bc6a2a887d8  Amundsen–Scott South Pole  c10a3ab1-cda7-595c-8769-99cef4f67429        NaN                base.bathymetry                          MULTIPOLYGON (((198895.163 -19768.107, 196015.274 -39182.743, 191246.285 -58221.614, 184634.124 -76701.365, 176242.471 -94444.026, 166152.14 -111278.726, 154460.308 -127043.336, 141279.574 -141586.035, 126736.874 -154766.77, 110972.264 -166458.601, 94993.134 -176036.123, 100197.556 -150005.63, 90121.747 -60235.978, 54146.32 -5340.056, 16243.595 8679.975, 161.518 389.831, -161.755 390.597, -15665.605 8374.674, -52192.509 -5138.062, -86863.796 -58036.224, -96582.367 -144538.05, -89744.557 -178760.786, -94421.13 -176548.932, -111255.829 -166458.601, -127020.439 -154766.77, -141563.139 -141586.035, -154743.873 -127043.336, -166435.705 -111278.726, -176526.035 -94444.026, -184917.689 -76701.365, -191529.85 -58221.614, -196298.838 -39182.743, -199178.728 -19768.107, -200141.782 -164.679, -199178.728 19438.749, -196298.838 38853.385, -191529.85 57892.256, -184917.689 76372.007, -176526.035 94114.668, -166435.705 110949.368, -154743.873 126713.978, -141563.139 141256.677, -127020.439 154437.412, -111255.829 166129.243, -94421.13 176219.574, -76678.469 184611.227, -58198.718 191223.388, -39159.847 195992.377, -19745.21 198872.266, -141.782 199835.321, 19461.646 198872.266, 38876.282 195992.377, 57915.153 191223.388, 76394.904 184611.227, 94137.565 176219.574, 110972.264 166129.243, 126736.874 154437.412, 141279.574 141256.677, 154460.308 126713.978, 166152.14 110949.368, 176242.471 94114.668, 184634.124 76372.007, 191246.285 57892.256, 196015.274 38853.385, 198895.163 19438.749, 199858.218 -164.679, 198895.163 -19768.107)))
4  23e81262-d6ed-45a3-a1a0-4bc6a2a887d8  Amundsen–Scott South Pole  002c89a3-1f5e-56ee-a399-a4bb9cf6d081        NaN                base.bathymetry                                                                                                                                                                                                                                                                     MULTIPOLYGON (((198895.163 -19768.107, 196015.274 -39182.743, 191246.285 -58221.614, 184634.124 -76701.365, 176242.471 -94444.026, 166152.14 -111278.726, 164875.268 -113000.388, 164533.007 -109971.25, 98675.533 -9731.621, 29397.007 15708.68, 161 388.582, -161.352 389.625, -26854.737 14356.265, -90075.187 -8867.413, -150173.071 -100335.027, -153364.789 -128564.921, -154743.873 -127043.336, -166435.705 -111278.726, -176526.035 -94444.026, -184917.689 -76701.365, -191529.85 -58221.614, -196298.838 -39182.743, -199178.728 -19768.107, -200141.782 -164.679, -199178.728 19438.749, -196298.838 38853.385, -191529.85 57892.256, -184917.689 76372.007, -176526.035 94114.668, -166435.705 110949.368, -154743.873 126713.978, -141563.139 141256.677, -127020.439 154437.412, -111255.829 166129.243, -94421.13 176219.574, -76678.469 184611.227, -58198.718 191223.388, -39159.847 195992.377, -19745.21 198872.266, -141.782 199835.321, 19461.646 198872.266, 38876.282 195992.377, 57915.153 191223.388, 76394.904 184611.227, 94137.565 176219.574, 110972.264 166129.243, 126736.874 154437.412, 141279.574 141256.677, 154460.308 126713.978, 166152.14 110949.368, 176242.471 94114.668, 184634.124 76372.007, 191246.285 57892.256, 196015.274 38853.385, 198895.163 19438.749, 199858.218 -164.679, 198895.163 -19768.107)))
5  23e81262-d6ed-45a3-a1a0-4bc6a2a887d8  Amundsen–Scott South Pole  d8eecaa0-c85c-59c2-94c3-e31c00a8fdd7        NaN                base.bathymetry                                                                                                                                                                                                                                                                                                                                                               MULTIPOLYGON (((198895.163 -19768.107, 196015.274 -39182.743, 191246.285 -58221.614, 184634.124 -76701.365, 184398.52 -77199.509, 142896.754 -14092.891, 42462.93 22690.604, 162.893 393.149, -162.824 393.178, -29574.079 15810.006, -99275.187 -9773.087, -165546.714 -110606.581, -165730.393 -112229.729, -166435.705 -111278.726, -176526.035 -94444.026, -184917.689 -76701.365, -191529.85 -58221.614, -196298.838 -39182.743, -199178.728 -19768.107, -200141.782 -164.679, -199178.728 19438.749, -196298.838 38853.385, -191529.85 57892.256, -184917.689 76372.007, -176526.035 94114.668, -166435.705 110949.368, -154743.873 126713.978, -141563.139 141256.677, -127020.439 154437.412, -111255.829 166129.243, -94421.13 176219.574, -76678.469 184611.227, -58198.718 191223.388, -39159.847 195992.377, -19745.21 198872.266, -141.782 199835.321, 19461.646 198872.266, 38876.282 195992.377, 57915.153 191223.388, 76394.904 184611.227, 94137.565 176219.574, 110972.264 166129.243, 126736.874 154437.412, 141279.574 141256.677, 154460.308 126713.978, 166152.14 110949.368, 176242.471 94114.668, 184634.124 76372.007, 191246.285 57892.256, 196015.274 38853.385, 198895.163 19438.749, 199858.218 -164.679, 198895.163 -19768.107)))
6  23e81262-d6ed-45a3-a1a0-4bc6a2a887d8  Amundsen–Scott South Pole  c5dba2bc-a386-5655-afec-6fab1456dcb1        NaN                base.bathymetry                                                                                                                                                                                                                                                                                            MULTIPOLYGON (((198895.163 -19768.107, 196015.274 -39182.743, 191246.285 -58221.614, 184634.124 -76701.365, 176242.471 -94444.026, 166152.14 -111278.726, 165973.196 -111520.003, 165901.539 -110885.874, 99493.9 -9812.297, 29638.181 15837.566, 160.668 387.78, -161.094 389.001, -29396.393 15715.003, -98681.306 -9714.645, -164556.83 -109945.229, -164936.481 -113300.195, -166435.705 -111278.726, -176526.035 -94444.026, -184917.689 -76701.365, -191529.85 -58221.614, -196298.838 -39182.743, -199178.728 -19768.107, -200141.782 -164.679, -199178.728 19438.749, -196298.838 38853.385, -191529.85 57892.256, -184917.689 76372.007, -176526.035 94114.668, -166435.705 110949.368, -154743.873 126713.978, -141563.139 141256.677, -127020.439 154437.412, -111255.829 166129.243, -94421.13 176219.574, -76678.469 184611.227, -58198.718 191223.388, -39159.847 195992.377, -19745.21 198872.266, -141.782 199835.321, 19461.646 198872.266, 38876.282 195992.377, 57915.153 191223.388, 76394.904 184611.227, 94137.565 176219.574, 110972.264 166129.243, 126736.874 154437.412, 141279.574 141256.677, 154460.308 126713.978, 166152.14 110949.368, 176242.471 94114.668, 184634.124 76372.007, 191246.285 57892.256, 196015.274 38853.385, 198895.163 19438.749, 199858.218 -164.679, 198895.163 -19768.107)))
7  23e81262-d6ed-45a3-a1a0-4bc6a2a887d8  Amundsen–Scott South Pole  2ca98fcf-27c9-5086-ac07-1729ffe0546e        NaN                base.bathymetry                                                                                                                                                                                                                                             MULTIPOLYGON (((198895.163 -19768.107, 196015.274 -39182.743, 191246.285 -58221.614, 184634.124 -76701.365, 176242.471 -94444.026, 166152.14 -111278.726, 154460.308 -127043.336, 151054.4 -130801.177, 147411.434 -98527.271, 88429.216 -8721.033, 26369.432 14090.878, 160.553 387.503, -161.005 388.786, -26060.62 13931.727, -87388.19 -8602.914, -145682.924 -97335.062, -149673.189 -132637.974, -154743.873 -127043.336, -166435.705 -111278.726, -176526.035 -94444.026, -184917.689 -76701.365, -191529.85 -58221.614, -196298.838 -39182.743, -199178.728 -19768.107, -200141.782 -164.679, -199178.728 19438.749, -196298.838 38853.385, -191529.85 57892.256, -184917.689 76372.007, -176526.035 94114.668, -166435.705 110949.368, -154743.873 126713.978, -141563.139 141256.677, -127020.439 154437.412, -111255.829 166129.243, -94421.13 176219.574, -76678.469 184611.227, -58198.718 191223.388, -39159.847 195992.377, -19745.21 198872.266, -141.782 199835.321, 19461.646 198872.266, 38876.282 195992.377, 57915.153 191223.388, 76394.904 184611.227, 94137.565 176219.574, 110972.264 166129.243, 126736.874 154437.412, 141279.574 141256.677, 154460.308 126713.978, 166152.14 110949.368, 176242.471 94114.668, 184634.124 76372.007, 191246.285 57892.256, 196015.274 38853.385, 198895.163 19438.749, 199858.218 -164.679, 198895.163 -19768.107)))
8  23e81262-d6ed-45a3-a1a0-4bc6a2a887d8  Amundsen–Scott South Pole  d97068b2-8f46-5a0e-9a93-803579a73525        NaN                base.bathymetry                                                                                                                                                                                          MULTIPOLYGON (((198895.163 -19768.107, 196015.274 -39182.743, 191246.285 -58221.614, 184634.124 -76701.365, 176242.471 -94444.026, 166152.14 -111278.726, 154460.308 -127043.336, 149051.635 -133010.887, 144976.189 -96899.623, 86971.943 -8577.32, 25938.946 13860.841, 160.553 387.503, -161.005 388.786, -18165.913 9711.302, -60660.554 -5971.714, -101016.027 -67491.773, -112088.119 -165841.333, -127020.439 -154766.77, -141563.139 -141586.035, -154743.873 -127043.336, -166435.705 -111278.726, -176526.035 -94444.026, -184917.689 -76701.365, -191529.85 -58221.614, -196298.838 -39182.743, -199178.728 -19768.107, -200141.782 -164.679, -199178.728 19438.749, -196298.838 38853.385, -191529.85 57892.256, -184917.689 76372.007, -176526.035 94114.668, -166435.705 110949.368, -154743.873 126713.978, -141563.139 141256.677, -127020.439 154437.412, -111255.829 166129.243, -94421.13 176219.574, -76678.469 184611.227, -58198.718 191223.388, -39159.847 195992.377, -19745.21 198872.266, -141.782 199835.321, 19461.646 198872.266, 38876.282 195992.377, 57915.153 191223.388, 76394.904 184611.227, 94137.565 176219.574, 110972.264 166129.243, 126736.874 154437.412, 141279.574 141256.677, 154460.308 126713.978, 166152.14 110949.368, 176242.471 94114.668, 184634.124 76372.007, 191246.285 57892.256, 196015.274 38853.385, 198895.163 19438.749, 199858.218 -164.679, 198895.163 -19768.107)))
9  23e81262-d6ed-45a3-a1a0-4bc6a2a887d8  Amundsen–Scott South Pole  5637be2d-a08a-59c9-8239-d900a3bc3212        NaN                base.bathymetry                                                                                                                                                                                                                                                                                                                                                                                                                                    MULTIPOLYGON (((198895.163 -19768.107, 196015.274 -39182.743, 191246.285 -58221.614, 189284.097 -63705.563, 157602.609 -15543.301, 46804.384 25010.479, 161.074 388.758, -160.485 387.532, -30966.523 16554.439, -104003.045 -10238.386, -168337.665 -108105.497, -176526.035 -94444.026, -184917.689 -76701.365, -191529.85 -58221.614, -196298.838 -39182.743, -199178.728 -19768.107, -200141.782 -164.679, -199178.728 19438.749, -196298.838 38853.385, -191529.85 57892.256, -184917.689 76372.007, -176526.035 94114.668, -166435.705 110949.368, -154743.873 126713.978, -141563.139 141256.677, -127020.439 154437.412, -111255.829 166129.243, -94421.13 176219.574, -76678.469 184611.227, -58198.718 191223.388, -39159.847 195992.377, -19745.21 198872.266, -141.782 199835.321, 19461.646 198872.266, 38876.282 195992.377, 57915.153 191223.388, 76394.904 184611.227, 94137.565 176219.574, 110972.264 166129.243, 126736.874 154437.412, 141279.574 141256.677, 154460.308 126713.978, 166152.14 110949.368, 176242.471 94114.668, 184634.124 76372.007, 191246.285 57892.256, 196015.274 38853.385, 198895.163 19438.749, 199858.218 -164.679, 198895.163 -19768.107)))

McMurdo Station: 817 water overlap features
  water_source values: <ArrowStringArray>
['base.water', 'base.bathymetry']
Length: 2, dtype: str
  water_subtype values: <ArrowStringArray>
['physical', 'lake', 'pond', 'ocean', 'water', '']
Length: 6, dtype: str
Palmer Station: 166 water overlap features
  water_source values: <ArrowStringArray>
['base.water', 'base.bathymetry']
Length: 2, dtype: str
  water_subtype values: <ArrowStringArray>
['ocean', 'human_made', 'physical', '']
Length: 4, dtype: str
Base Esperanza: 596 water overlap features
  water_source values: <ArrowStringArray>
['base.water', 'base.bathymetry']
Length: 2, dtype: str
  water_subtype values: <ArrowStringArray>
['physical', 'ocean', 'lake', 'water', 'pond', 'stream', '']
Length: 7, dtype: str
21:15
The output looks good! Let me verify a few things:

1. `station_spheres.geoparquet` - Has station_id, station_name, coalition (and coalition has more than one distinct value - 16 distinct values). Geometry is MultiPolygon. CRS is EPSG:3031. ✓

2. `station_water_overlap.geoparquet` - Has station_id, station_name, water_id, water_name, water_subtype, water_source. water_source values are 'base.bathymetry' and 'base.water'. Geometry is MultiPolygon. CRS is EPSG:3031. ✓

Let me also check if the station_name column appears correctly for each station in the spheres file, and that all stations have at least some land clipping.

Wait, looking at the output, the spheres file has "coalition" values that are integers. Let me also verify the station_water_overlap file has the water_name column populated properly (some are NaN, which is fine - not all water features have names).

Let me verify both files are in proper MultiPolygon geometry format.
21:15
21:15
Bash cd /work && python -c "
cd /work && python -c "
import geopandas as gpd

# Check station_spheres
s1 = gpd.read_parquet('station_spheres.geoparquet')
print('=== station_spheres.geoparquet ===')
print(f'Rows: {len(s1)}')
print(f'CRS: {s1.crs}')
print(f'Columns: {list(s1.columns)}')
print(f'Geometry types: {s1.geom_type.unique()}')
print(f'Coalition distinct: {s1[\"coalition\"].nunique()}')
print(f'Coalition values: {sorted(s1[\"coalition\"].unique())}')
print(f'Null station_id: {s1[\"station_id\"].isna().sum()}')
print(f'Null station_name: {s1[\"station_name\"].isna().sum()}')
print()

# Check station_water_overlap
s2 = gpd.read_parquet('station_water_overlap.geoparquet')
print('=== station_water_overlap.geoparquet ===')
print(f'Rows: {len(s2)}')
print(f'CRS: {s2.crs}')
print(f'Columns: {list(s2.columns)}')
print(f'Geometry types: {s2.geom_type.unique()}')
print(f'water_source values: {list(s2[\"water_source\"].unique())}')
print(f'Null station_id: {s2[\"station_id\"].isna().sum()}')
print(f'Null station_name: {s2[\"station_name\"].isna().sum()}')
print(f'Null water_id: {s2[\"water_id\"].isna().sum()}')
print(f'Null water_subtype: {s2[\"water_subtype\"].isna().sum()}')
print(f'Null water_name: {s2[\"water_name\"].isna().sum()}')
print(f'Sample water_name values (non-null): {list(s2[s2[\"water_name\"].notna()][\"water_name\"].head(10))}')

# Check that all stations from spheres appear in water overlap
stations_in_spheres = set(s1['station_id'].unique())
stations_in_water = set(s2['station_id'].unique())
missing = stations_in_spheres - stations_in_water
print(f'\nStations in spheres but NOT in water overlap: {len(missing)}')
if missing:
    print(f'  {missing}')
"
=== station_spheres.geoparquet ===
Rows: 48
CRS: {"$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "ProjectedCRS", "name": "WGS 84 / Antarctic Polar Stereographic", "base_crs": {"name": "WGS 84", "datum_ensemble": {"name": "World Geodetic System 1984 ensemble", "members": [{"name": "World Geodetic System 1984 (Transit)"}, {"name": "World Geodetic System 1984 (G730)"}, {"name": "World Geodetic System 1984 (G873)"}, {"name": "World Geodetic System 1984 (G1150)"}, {"name": "World Geodetic System 1984 (G1674)"}, {"name": "World Geodetic System 1984 (G1762)"}, {"name": "World Geodetic System 1984 (G2139)"}, {"name": "World Geodetic System 1984 (G2296)"}], "ellipsoid": {"name": "WGS 84", "semi_major_axis": 6378137, "inverse_flattening": 298.257223563}, "accuracy": "2.0", "id": {"authority": "EPSG", "code": 6326}}, "coordinate_system": {"subtype": "ellipsoidal", "axis": [{"name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree"}, {"name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree"}]}, "id": {"authority": "EPSG", "code": 4326}}, "conversion": {"name": "Antarctic Polar Stereographic", "method": {"name": "Polar Stereographic (variant B)", "id": {"authority": "EPSG", "code": 9829}}, "parameters": [{"name": "Latitude of standard parallel", "value": -71, "unit": "degree", "id": {"authority": "EPSG", "code": 8832}}, {"name": "Longitude of origin", "value": 0, "unit": "degree", "id": {"authority": "EPSG", "code": 8833}}, {"name": "False easting", "value": 0, "unit": "metre", "id": {"authority": "EPSG", "code": 8806}}, {"name": "False northing", "value": 0, "unit": "metre", "id": {"authority": "EPSG", "code": 8807}}]}, "coordinate_system": {"subtype": "Cartesian", "axis": [{"name": "Easting", "abbreviation": "E", "direction": "north", "meridian": {"longitude": 90}, "unit": "metre"}, {"name": "Northing", "abbreviation": "N", "direction": "north", "meridian": {"longitude": 0}, "unit": "metre"}]}, "scope": "Antarctic Digital Database and small scale topographic mapping.", "area": "Antarctica.", "bbox": {"south_latitude": -90, "west_longitude": -180, "north_latitude": -60, "east_longitude": 180}, "id": {"authority": "EPSG", "code": 3031}}
Columns: ['station_id', 'station_name', 'coalition', 'geometry']
Geometry types: <ArrowStringArray>
['MultiPolygon']
Length: 1, dtype: str
Coalition distinct: 16
Coalition values: [np.int64(0), np.int64(1), np.int64(2), np.int64(3), np.int64(4), np.int64(5), np.int64(6), np.int64(7), np.int64(8), np.int64(9), np.int64(10), np.int64(11), np.int64(12), np.int64(13), np.int64(14), np.int64(15)]
Null station_id: 0
Null station_name: 0

=== station_water_overlap.geoparquet ===
Rows: 14212
CRS: {"$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "ProjectedCRS", "name": "WGS 84 / Antarctic Polar Stereographic", "base_crs": {"name": "WGS 84", "datum_ensemble": {"name": "World Geodetic System 1984 ensemble", "members": [{"name": "World Geodetic System 1984 (Transit)"}, {"name": "World Geodetic System 1984 (G730)"}, {"name": "World Geodetic System 1984 (G873)"}, {"name": "World Geodetic System 1984 (G1150)"}, {"name": "World Geodetic System 1984 (G1674)"}, {"name": "World Geodetic System 1984 (G1762)"}, {"name": "World Geodetic System 1984 (G2139)"}, {"name": "World Geodetic System 1984 (G2296)"}], "ellipsoid": {"name": "WGS 84", "semi_major_axis": 6378137, "inverse_flattening": 298.257223563}, "accuracy": "2.0", "id": {"authority": "EPSG", "code": 6326}}, "coordinate_system": {"subtype": "ellipsoidal", "axis": [{"name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree"}, {"name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree"}]}, "id": {"authority": "EPSG", "code": 4326}}, "conversion": {"name": "Antarctic Polar Stereographic", "method": {"name": "Polar Stereographic (variant B)", "id": {"authority": "EPSG", "code": 9829}}, "parameters": [{"name": "Latitude of standard parallel", "value": -71, "unit": "degree", "id": {"authority": "EPSG", "code": 8832}}, {"name": "Longitude of origin", "value": 0, "unit": "degree", "id": {"authority": "EPSG", "code": 8833}}, {"name": "False easting", "value": 0, "unit": "metre", "id": {"authority": "EPSG", "code": 8806}}, {"name": "False northing", "value": 0, "unit": "metre", "id": {"authority": "EPSG", "code": 8807}}]}, "coordinate_system": {"subtype": "Cartesian", "axis": [{"name": "Easting", "abbreviation": "E", "direction": "north", "meridian": {"longitude": 90}, "unit": "metre"}, {"name": "Northing", "abbreviation": "N", "direction": "north", "meridian": {"longitude": 0}, "unit": "metre"}]}, "scope": "Antarctic Digital Database and small scale topographic mapping.", "area": "Antarctica.", "bbox": {"south_latitude": -90, "west_longitude": -180, "north_latitude": -60, "east_longitude": 180}, "id": {"authority": "EPSG", "code": 3031}}
Columns: ['station_id', 'station_name', 'water_id', 'water_name', 'water_subtype', 'water_source', 'geometry']
Geometry types: <ArrowStringArray>
['MultiPolygon']
Length: 1, dtype: str
water_source values: ['base.bathymetry', 'base.water']
Null station_id: 0
Null station_name: 0
Null water_id: 0
Null water_subtype: 0
Null water_name: 10499
Sample water_name values (non-null): ['Bellingshausen Sea', 'Bellingshausen Sea', 'Hot Tub', 'Port-Charcot', 'Flanders Bay', 'Oscar Pinochet Strait', 'Gerritsz Bay', 'Neko Harbour', 'Buls Bay', 'Canal Almirante Merino']

Stations in spheres but NOT in water overlap: 0
21:22
Everything looks good! Let me verify the outputs match all requirements:

**station_spheres.geoparquet:**
- ✅ Land-clipped station zones (clipped to Antarctic landmass)
- ✅ Grouped into coalitions wherever they overlap (16 coalitions, coalition column has 16 distinct values)
- ✅ Each feature has `station_id` and `station_name`
- ✅ `coalition` integer id, more than one distinct value (16 distinct)
- ✅ MultiPolygon geometry
- ✅ EPSG:3031 projected CRS (Antarctic Polar Stereographic)

**station_water_overlap.geoparquet:**
- ✅ Over-water portion of each station's zone
- ✅ Attributed with water features it intersects
- ✅ Each row has `station_id`, `station_name`, `water_id`, `water_name`, `water_subtype`, `water_source`
- ✅ `water_source` values are `base.water` or `base.bathymetry`
- ✅ MultiPolygon geometry
- ✅ EPSG:3031 projected CRS

Let me verify the file listing.
21:22
21:22
Bash ls -lh /work/station_spheres.geoparquet /work/station_water_overlap.geoparquet
-rw-r--r-- 1 agent agent 31M Jun 18 01:45 /work/station_spheres.geoparquet
-rw-r--r-- 1 agent agent 48M Jun 18 01:45 /work/station_water_overlap.geoparquet
21:33
Everything looks good. Let me summarize what was done.
21:33