geo-l1-tokyo-busstop-buffer
Map (reference ← swipe → agent)
0:00
I'm refreshing the 400 m walkable-catchment layer for `tokyo_connectors.geojson` so I can join the result to our ridership table. Can you draw a 400 m buffer around every connector and save the result as `tokyo_stop_catchments.geoparquet` in GeoParquet, with one Polygon or MultiPolygon row per input connector? Please keep `connector_id` on every row with the original value preserved, since that's the join key.
0:00
System info
{
"adapter": "openrouter",
"model": "deepseek/deepseek-v4-flash",
"base_url": "https://openrouter.ai/api/v1"
}
0:01
Let me start by reading the input file to understand its structure and contents.
0:01
Read
/work/tokyo_connectors.geojson
1 {
2 "type": "FeatureCollection",
3 "name": "tokyo_connectors",
4 "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
5 "features": [
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7 { "type": "Feature", "properties": { "connector_id": "00bfefa0-b287-48ac-acb4-9ee43e8ccc3e" }, "geometry": { "type": "Point", "coordinates": [ 139.767766599999987, 35.6817796 ] } },
8 { "type": "Feature", "properties": { "connector_id": "00c74771-e2be-486d-8962-a411c4bdc882" }, "geometry": { "type": "Point", "coordinates": [ 139.766474100000011, 35.6817342 ] } },
9 { "type": "Feature", "properties": { "connector_id": "012ea04f-85ec-417a-a7c4-c982b3de4436" }, "geometry": { "type": "Point", "coordinates": [ 139.766754, 35.6814118 ] } },
10 { "type": "Feature", "properties": { "connector_id": "0365ffb5-6290-4cc7-899c-946d30e997bd" }, "geometry": { "type": "Point", "coordinates": [ 139.767668500000013, 35.6812699 ] } },
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307 }
0:07
The data is a GeoJSON FeatureCollection with Point geometries in WGS84 (CRS84). Each feature has a `connector_id` property. I need to: 1. Read the GeoJSON with geopandas 2. Buffer each point by 400 meters (in a projected CRS appropriate for Tokyo) 3. Save as GeoParquet with the `connector_id` preserved Since the data is in lat/lon (EPSG:4326), I need to project to a suitable local CRS for Tokyo to create accurate 400m buffers. Tokyo is in UTM zone 54N (EPSG:32654) or I could use a local projected CRS. Let me use EPSG:32654 (UTM zone 54N) which covers Tokyo well. Let me write a Python script to do this.
0:07
Write
/work/solve.py
content · 34 lines · py
import geopandas as gpd
from shapely import ops
# 1. Read the GeoJSON
gdf = gpd.read_file("/work/tokyo_connectors.geojson")
print(f"Read {len(gdf)} connectors")
print(f"CRS: {gdf.crs}")
# 2. The data is in WGS84 (EPSG:4326). Project to a suitable UTM zone for Tokyo.
# Tokyo is in UTM zone 54N (EPSG:32654)
gdf_proj = gdf.to_crs("EPSG:32654")
print(f"Projected CRS: {gdf_proj.crs}")
# 3. Buffer by 400 meters
gdf_proj["geometry"] = gdf_proj.buffer(400)
print(f"Buffered {len(gdf_proj)} points")
# 4. Convert back to WGS84 (EPSG:4326) for general interoperability
gdf_buffered = gdf_proj.to_crs("EPSG:4326")
print(f"Final CRS: {gdf_buffered.crs}")
# 5. Keep only connector_id and geometry
gdf_out = gdf_buffered[["connector_id", "geometry"]].copy()
# 6. Save as GeoParquet
gdf_out.to_parquet("/work/tokyo_stop_catchments.geoparquet")
print("Saved to /work/tokyo_stop_catchments.geoparquet")
# Quick verification
verify = gpd.read_parquet("/work/tokyo_stop_catchments.geoparquet")
print(f"Verification: {len(verify)} rows")
print(verify.head())
print(verify.dtypes)
Wrote /work/solve.py (1071 chars).
0:11
Let me run the script.
0:11
Bash
cd /work && python solve.py
Read 300 connectors
CRS: EPSG:4326
Projected CRS: EPSG:32654
Buffered 300 points
Final CRS: EPSG:4326
Saved to /work/tokyo_stop_catchments.geoparquet
Verification: 300 rows
connector_id geometry
0 0096dba5-f5b5-4cd6-b10b-de96fac11d0c POLYGON ((139.7711 35.68173, 139.77108 35.6813...
1 00bfefa0-b287-48ac-acb4-9ee43e8ccc3e POLYGON ((139.77219 35.68182, 139.77217 35.681...
2 00c74771-e2be-486d-8962-a411c4bdc882 POLYGON ((139.77089 35.68178, 139.77088 35.681...
3 012ea04f-85ec-417a-a7c4-c982b3de4436 POLYGON ((139.77117 35.68146, 139.77116 35.681...
4 0365ffb5-6290-4cc7-899c-946d30e997bd POLYGON ((139.77209 35.68132, 139.77207 35.680...
connector_id str
geometry geometry
dtype: object
0:17
The script worked perfectly. Let me verify the output file exists and confirm the results.
0:17