crs-l2-fiji-antimeridian
Map (reference ← swipe → agent)
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I'm pulling together per-transect coverage figures for our survey report, but some of the lines in fiji_transects_wgs84.geojson render as arcs spanning the entire globe instead of short local segments. Can you fix the geometries so they render correctly, convert them to Fiji's national metric grid, and give me each transect as one MultiLineString feature with a length_m attribute in metres?
Every feature must come out as a MultiLineString, so do not leave any transects as plain LineString, and the problematic ones must end up as multi-part geometries that faithfully represent the actual survey path. Carry the survey attributes (vessel and survey_date) through unchanged, use transect_id as the key field, and write the result as GeoJSON named fiji_transects_fmg.geojson.
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System info
{
"adapter": "openrouter",
"model": "google/gemma-4-26b-a4b-it",
"base_url": "https://openrouter.ai/api/v1"
}
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Bash
ls -F
fiji_transects_wgs84.geojson
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Bash
head -n 20 fiji_transects_wgs84.geojson
{
"type": "FeatureCollection",
"name": "fiji_transects_wgs84",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
"features": [
{ "type": "Feature", "properties": { "transect_id": "T001", "vessel": "Taveuni II", "survey_date": "2025-08-15", "crosses_antimeridian_flag": true }, "geometry": { "type": "LineString", "coordinates": [ [ 178.941879580782086, -17.632301816020771 ], [ 179.456655009654696, -17.623768593111961 ], [ 179.971430438527307, -17.611072392823225 ], [ -179.513794132600054, -17.596198176111951 ], [ -178.999018703727444, -17.579632069513806 ], [ -178.484243274854833, -17.577321872344196 ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T002", "vessel": "Bligh", "survey_date": "2025-08-12", "crosses_antimeridian_flag": true }, "geometry": { "type": "LineString", "coordinates": [ [ 179.070288824800542, -17.334767984150709 ], [ 179.725942881740252, -17.171343988196945 ], [ -179.618403061320009, -17.007726843860763 ], [ -178.962749004380299, -16.834850408534852 ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T003", "vessel": "Lomaiviti", "survey_date": "2025-08-12", "crosses_antimeridian_flag": true }, "geometry": { "type": "LineString", "coordinates": [ [ 177.636947428758333, -17.358837040696127 ], [ 178.462815605623859, -17.416074837434927 ], [ 179.288683782489386, -17.471713663377283 ], [ -179.885448040645059, -17.527675804260884 ], [ -179.059579863779533, -17.590577543375694 ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T004", "vessel": "Vanua I", "survey_date": "2025-08-15", "crosses_antimeridian_flag": true }, "geometry": { "type": "LineString", "coordinates": [ [ 178.873696381462679, -17.803295238757038 ], [ 179.542254331047587, -17.598477321703708 ], [ -179.789187719367533, -17.405549472537043 ], [ -179.120629769782624, -17.19411411231702 ], [ -178.452071820197745, -16.992332922174427 ], [ -177.783513870612836, -16.795171196845544 ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T005", "vessel": "Bligh", "survey_date": "2025-08-19", "crosses_antimeridian_flag": true }, "geometry": { "type": "LineString", "coordinates": [ [ 177.596924830927293, -17.923255155112717 ], [ 178.160696712947697, -18.010328270600898 ], [ 178.724468594968101, -18.099224972140938 ], [ 179.288240476988506, -18.17532145144995 ], [ 179.85201235900891, -18.270380145331412 ], [ -179.584215758970686, -18.358875431719703 ], [ -179.020443876950281, -18.437390943572723 ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T006", "vessel": "Cakaulevu", "survey_date": "2025-08-13", "crosses_antimeridian_flag": true }, "geometry": { "type": "LineString", "coordinates": [ [ 178.622166647099931, -18.382052393687179 ], [ 179.205668025282989, -18.184610858038685 ], [ 179.789169403466019, -17.991866703295319 ], [ -179.627329218350923, -17.789532271264445 ], [ -179.043827840167864, -17.595682751178369 ], [ -178.460326461984835, -17.393483000040479 ], [ -177.876825083801776, -17.203490564162109 ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T007", "vessel": "Vanua I", "survey_date": "2025-08-19", "crosses_antimeridian_flag": true }, "geometry": { "type": "LineString", "coordinates": [ [ 177.920101619592742, -17.14979850360189 ], [ 178.697177550619955, -17.100522188212071 ], [ 179.474253481647168, -17.053867486482115 ], [ -179.74867058732562, -17.004197778897627 ], [ -178.971594656298407, -16.959481244370728 ], [ -178.194518725271195, -16.911697858015476 ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T008", "vessel": "Taveuni II", "survey_date": "2025-08-12", "crosses_antimeridian_flag": true }, "geometry": { "type": "LineString", "coordinates": [ [ 179.401134548056262, -17.934415957637167 ], [ 179.67454249485786, -17.899654147497863 ], [ 179.947950441659486, -17.858130727687527 ], [ -179.778641611538916, -17.811143619533269 ], [ -179.50523366473729, -17.768768396969666 ], [ -179.231825717935692, -17.724708363613253 ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T009", "vessel": "Vanua I", "survey_date": "2025-08-13", "crosses_antimeridian_flag": true }, "geometry": { "type": "LineString", "coordinates": [ [ 178.068433112639013, -16.657838811131668 ], [ 178.561564721122721, -16.689731320158675 ], [ 179.054696329606429, -16.72173241552732 ], [ 179.547827938090137, -16.748891897767297 ], [ -179.959040453426155, -16.775241845025921 ], [ -179.465908844942447, -16.799281899607834 ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T010", "vessel": "Vanua I", "survey_date": "2025-08-15", "crosses_antimeridian_flag": true }, "geometry": { "type": "LineString", "coordinates": [ [ 177.602847396853463, -17.277026295424367 ], [ 179.128053569323441, -17.468285296635063 ], [ -179.346740258206609, -17.65419136085664 ], [ -177.82153408573663, -17.837325774502055 ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T011", "vessel": "Taveuni II", "survey_date": "2025-08-20", "crosses_antimeridian_flag": false }, "geometry": { "type": "LineString", "coordinates": [ [ -176.863797870333627, -17.7932433540029 ], [ -176.985724572324699, -17.81273654528005 ], [ -177.107651274315742, -17.824236921378098 ], [ -177.229577976306814, -17.835861250474697 ], [ -177.351504678297886, -17.857559546831705 ], [ -177.473431380288929, -17.871769203842408 ], [ -177.595358082280001, -17.890225470404214 ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T012", "vessel": "Taveuni II", "survey_date": "2025-08-20", "crosses_antimeridian_flag": false }, "geometry": { "type": "LineString", "coordinates": [ [ 176.312195951017685, -17.976122209608448 ], [ 176.362236324041447, -17.722210270969462 ], [ 176.412276697065209, -17.470306839752467 ], [ 176.462317070088972, -17.226475769084448 ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T013", "vessel": "Bligh", "survey_date": "2025-08-19", "crosses_antimeridian_flag": false }, "geometry": { "type": "LineString", "coordinates": [ [ -176.70823848972006, -17.696306145080879 ], [ -177.205026853648661, -17.960082567744127 ], [ -177.701815217577291, -18.210737758337459 ], [ -178.198603581505893, -18.469124252379427 ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T014", "vessel": "Lomaiviti", "survey_date": "2025-08-13", "crosses_antimeridian_flag": false }, "geometry": { "type": "LineString", "coordinates": [ [ 176.538496893308832, -16.594358164012139 ], [ 176.861572490827996, -16.71494251806207 ], [ 177.184648088347188, -16.832251271240672 ], [ 177.507723685866381, -16.976116506165042 ], [ 177.830799283385545, -17.090939089364483 ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T015", "vessel": "Vanua I", "survey_date": "2025-08-15", "crosses_antimeridian_flag": false }, "geometry": { "type": "LineString", "coordinates": [ [ -177.278377449219306, -16.724372731501912 ], [ -177.470251917030794, -16.761535677586746 ], [ -177.662126384842253, -16.787182414326686 ], [ -177.854000852653712, -16.818799270133983 ], [ -178.0458753204652, -16.856282470705128 ], [ -178.237749788276659, -16.891308864567598 ], [ -178.429624256088147, -16.914729063096839 ] ] } },
0:29
Write
/work/solve.py
content · 116 lines · py
import geopandas as gpd
import pandas as pd
from shapely.geometry import LineString, MultiLineString
from shapely.ops import transform
import pyproj
def fix_antimeridian_lines(gdf):
"""
Fixes LineStrings that cross the antimeridian by splitting them into MultiLineStrings.
It assumes that if a jump in longitude is large (e.g., > 180 degrees), it's an antimeridian crossing.
"""
new_features = []
for _, row in gdf.iterrows():
geom = row.geometry
if geom.is_empty:
new_features.append(row)
continue
# Get coordinates
coords = list(geom.coords)
if not coords:
new_features.append(row)
continue
split_segments = []
current_segment = [coords[0]]
for i in range(1, len(coords)):
prev_lon, prev_lat = coords[i-1]
curr_lon, curr_lat = coords[i]
# Check for antimeridian crossing:
# if the jump in longitude is more than 180 degrees (e.g. 179 to -179)
# or if the absolute difference between consecutive longitudes is > 180.
# In GeoJSON, coordinates are usually -180 to 180.
# A jump from 179 to -179 is a jump of 358 deg if calculated simply,
# but a jump of 2 deg if crossing antimeridian.
diff = abs(curr_lon - prev_lon)
if diff > 180:
# It's an antimeridian crossing.
# Close the current segment
if len(current_segment) >= 2:
split_segments.append(LineString(current_segment))
# Start new segment.
# We also need to handle the wrap-around for the longitude in the new segment
# so that the geometry is continuous in "unwrapped" space,
# BUT we want to return to the original CRS (WGS84).
# The prompt says "fix the geometries so they render correctly".
# Usually, this means splitting the line into two parts.
# One part ends at 179, next part starts at -179.
# Adjust the new coordinate to be "near" the previous one in a continuous sense
# if we were projecting, but for a simple split in WGS84:
current_segment = [coords[i]]
else:
current_segment.append(coords[i])
if len(current_segment) >= 2:
split_segments.append(LineString(current_segment))
if not split_segments:
new_features.append(row)
else:
# Combine all segments into a MultiLineString
multi_geom = MultiLineString(split_segments)
# Create a copy of the row and update geometry
new_row = row.copy()
new_row.geometry = multi_geom
new_features.append(new_row)
return gpd.GeoDataFrame(new_features, crs=gdf.crs)
def main():
# Load data
gdf = gpd.read_file('fiji_transects_wgs84.geojson')
print(f"Loaded {len(gdf)} features.")
# 1. Fix antimeridian geometries
print("Fixing antimeridian geometries...")
gdf_fixed = fix_antimeridian_lines(gdf)
# 2. Convert to Fiji National Metric Grid
# Fiji's EPSG code is 2978 (Fiji Grid) or similar.
# Let's check for a standard Fiji projection.
# EPSG:2978 is Fiji Grid.
# Let's use EPSG:2978.
target_crs = "EPSG:2978"
print(f"Projecting to {target_crs}...")
gdf_projected = gdf_fixed.to_crs(target_crs)
# 3. Calculate length_m
print("Calculating lengths...")
gdf_projected['length_m'] = gdf_projected.geometry.length
# 4. Ensure everything is MultiLineString
print("Ensuring all geometries are MultiLineString...")
def ensure_multiline(geom):
if geom.geom_type == 'LineString':
return MultiLineString([geom])
return geom
gdf_projected['geometry'] = gdf_projected.geometry.apply(ensure_multiline)
# 5. Save to GeoJSON
print("Saving to fiji_transects_fmg.geojson...")
gdf_projected.to_file('fiji_transects_fmg.geojson', driver='GeoJSON')
print("Done.")
if __name__ == "__main__":
main()
Wrote /work/solve.py (4318 chars).
0:30
Bash
python /work/solve.py
Loaded 30 features. Fixing antimeridian geometries... Projecting to EPSG:2978... Calculating lengths... Ensuring all geometries are MultiLineString... Saving to fiji_transects_fmg.geojson... Done.
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Bash
head -n 30 fiji_transects_fmg.geojson
{
"type": "FeatureCollection",
"name": "fiji_transects_fmg",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:EPSG::2978" } },
"features": [
{ "type": "Feature", "properties": { "transect_id": "T001", "vessel": "Taveuni II", "survey_date": "2025-08-15T00:00:00", "crosses_antimeridian_flag": true, "length_m": 272818.69027370471 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4057186.978743994608521, 7501490.88197785243392 ], [ -3990562.989241968840361, 7519594.794576410204172 ], [ -3924416.543200526386499, 7537849.291802688501775 ] ], [ [ -3858667.620355258695781, 7555989.889927031472325 ], [ -3793290.10984324477613, 7573957.023025639355183 ], [ -3727783.917402566410601, 7589643.742623878642917 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T002", "vessel": "Bligh", "survey_date": "2025-08-12T00:00:00", "crosses_antimeridian_flag": true, "length_m": 180927.64694186213 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4050666.360438455827534, 7546185.034948678687215 ], [ -3970687.292615190148354, 7589390.559027340263128 ] ], [ [ -3890927.465044286102057, 7631716.099139807745814 ], [ -3811664.771456338465214, 7674399.22692909091711 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T003", "vessel": "Lomaiviti", "survey_date": "2025-08-12T00:00:00", "crosses_antimeridian_flag": true, "length_m": 333940.94631498598 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4238464.044482219964266, 7494401.466757215559483 ], [ -4127423.395279933698475, 7514911.95050223916769 ], [ -4017538.704912162385881, 7534715.435817249119282 ] ], [ [ -3908705.451394856907427, 7553582.410255588591099 ], [ -3800680.829582385718822, 7570665.165481228381395 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T004", "vessel": "Vanua I", "survey_date": "2025-08-15T00:00:00", "crosses_antimeridian_flag": true, "length_m": 370592.21414783393 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4060091.600163646042347, 7475969.832558301277459 ], [ -3980323.588479571975768, 7525790.475991996005177 ] ], [ [ -3900270.937357514165342, 7573002.724729908630252 ], [ -3820935.502705058082938, 7621722.866998837329447 ], [ -3741414.285797285847366, 7668195.316860696300864 ], [ -3661895.434108520392329, 7713133.789540608413517 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T005", "vessel": "Bligh", "survey_date": "2025-08-19T00:00:00", "crosses_antimeridian_flag": true, "length_m": 381398.11776088015 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4222895.19729661475867, 7415185.388047736138105 ], [ -4145678.684903216548264, 7423249.230821310542524 ], [ -4068983.365978632122278, 7430700.200429175049067 ], [ -3993312.783225270919502, 7439525.055308904498816 ], [ -3917533.394576421007514, 7445440.026264049112797 ] ], [ [ -3842532.220792734064162, 7451902.551046738401055 ], [ -3768394.03990045003593, 7459356.669023869559169 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T006", "vessel": "Cakaulevu", "survey_date": "2025-08-13T00:00:00", "crosses_antimeridian_flag": true, "length_m": 407754.60135591205 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4072013.386766273528337, 7388770.954151820391417 ], [ -4003641.895763976499438, 7435495.569693414494395 ], [ -3935118.956585772335529, 7480783.979957517236471 ] ], [ [ -3866939.571860702708364, 7526575.426824647001922 ], [ -3798506.913532365113497, 7570462.772388414479792 ], [ -3730371.628425966016948, 7614711.890129117295146 ], [ -3661909.508072525262833, 7656612.145196046680212 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T007", "vessel": "Vanua I", "survey_date": "2025-08-19T00:00:00", "crosses_antimeridian_flag": true, "length_m": 416517.49602781865 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4208449.214158964343369, 7533040.314834531396627 ], [ -4107569.493033709004521, 7565889.221566676162183 ], [ -4007329.480703122913837, 7597350.279799181967974 ] ], [ [ -3907900.934754995629191, 7628228.465925453230739 ], [ -3809012.704658505506814, 7657485.830707443878055 ], [ -3710900.52556583750993, 7686235.015292932279408 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T008", "vessel": "Taveuni II", "survey_date": "2025-08-12T00:00:00", "crosses_antimeridian_flag": true, "length_m": 146553.13173814915 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -3987120.015662517398596, 7475802.004374168813229 ], [ -3953018.114732967689633, 7489459.673317324370146 ], [ -3919208.816735017113388, 7503888.893989851698279 ] ], [ [ -3885639.076961609534919, 7518910.683297421783209 ], [ -3851972.68114697933197, 7533174.503237062133849 ], [ -3818418.152347727678716, 7547526.283450357615948 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T009", "vessel": "Vanua I", "survey_date": "2025-08-13T00:00:00", "crosses_antimeridian_flag": true, "length_m": 267193.64970557881 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4205976.70141220279038, 7605929.22117679938674 ], [ -4139426.793498487211764, 7617749.036489377729595 ], [ -4073273.364599361084402, 7629233.930149489082396 ], [ -4007668.725306287407875, 7641063.830649314448237 ] ], [ [ -3942467.472642532549798, 7652690.454885971732438 ], [ -3877706.942803180776536, 7664320.699712052941322 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T010", "vessel": "Vanua I", "survey_date": "2025-08-15T00:00:00", "crosses_antimeridian_flag": true, "length_m": 409431.4511487839 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4245965.656445472501218, 7504512.560660600662231 ], [ -4038574.179807452484965, 7529930.589867516420782 ] ], [ [ -3835383.041818221099675, 7553399.042971542105079 ], [ -3636030.718867635820061, 7574709.881422424688935 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T011", "vessel": "Taveuni II", "survey_date": "2025-08-20T00:00:00", "crosses_antimeridian_flag": false, "length_m": 94827.713405829592 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -3517268.127865444868803, 7607585.376898313872516 ], [ -3531931.115169481374323, 7601661.157163100317121 ], [ -3546838.167644052766263, 7596756.03092491067946 ], [ -3561754.908018881455064, 7591812.159641010686755 ], [ -3576386.686157986987382, 7585527.288464969024062 ], [ -3591251.239713742397726, 7580197.791360345669091 ], [ -3606000.856782448012382, 7574287.721548304893076 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T012", "vessel": "Taveuni II", "survey_date": "2025-08-20T00:00:00", "crosses_antimeridian_flag": false, "length_m": 110759.82324191679 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4391164.571518260985613, 7360320.613502792082727 ], [ -4394530.046042621135712, 7397650.021330628544092 ], [ -4397657.184081426821649, 7434726.764913761988282 ], [ -4400317.445971770212054, 7470699.160521874204278 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T013", "vessel": "Bligh", "survey_date": "2025-08-19T00:00:00", "crosses_antimeridian_flag": false, "length_m": 217667.98690759443 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -3500634.66661041136831, 7624488.529779511503875 ], [ -3555019.78079743264243, 7576273.736240705475211 ], [ -3609635.98526506870985, 7529185.577286700718105 ], [ -3663853.314219099935144, 7480489.774256192147732 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T014", "vessel": "Lomaiviti", "survey_date": "2025-08-13T00:00:00", "crosses_antimeridian_flag": false, "length_m": 192985.46945932449 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4413774.153938710689545, 7562150.586639955639839 ], [ -4365658.892802538350224, 7556679.867402884177864 ], [ -4317929.406769572757185, 7551632.806110155768692 ], [ -4269506.442580503411591, 7542865.706725970841944 ], [ -4222392.127146146260202, 7538103.418793024495244 ] ] ] } },
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{ "type": "Feature", "properties": { "transect_id": "T018", "vessel": "Bligh", "survey_date": "2025-08-19T00:00:00", "crosses_antimeridian_flag": false, "length_m": 147355.0571320235 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4462123.444380414672196, 7510544.93428553827107 ], [ -4430710.601116840727627, 7491378.522975526750088 ], [ -4399257.654556686989963, 7471766.769270030781627 ], [ -4368137.635694316588342, 7453077.762156526558101 ], [ -4336752.643661714158952, 7433126.185787387192249 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T019", "vessel": "Lomaiviti", "survey_date": "2025-08-12T00:00:00", "crosses_antimeridian_flag": false, "length_m": 232764.1914454615 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4176851.705811001360416, 7459432.844160176813602 ], [ -4234651.248703385703266, 7458726.175438466481864 ], [ -4292666.868704052641988, 7457333.072217276319861 ], [ -4350927.18282030057162, 7455346.205549153499305 ], [ -4409516.225984890013933, 7453055.635055471211672 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T020", "vessel": "Taveuni II", "survey_date": "2025-08-13T00:00:00", "crosses_antimeridian_flag": false, "length_m": 277199.46117691754 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4350910.062632170505822, 7505239.048665195703506 ], [ -4281165.9444240629673, 7496325.606074975803494 ], [ -4212400.95752539485693, 7488938.498835170641541 ], [ -4143841.310585814528167, 7480197.145220424979925 ], [ -4075803.210624480620027, 7471335.400718780234456 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T021", "vessel": "Vanua I", "survey_date": "2025-08-16T00:00:00", "crosses_antimeridian_flag": false, "length_m": 298679.96831559524 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4432894.922866867855191, 7481944.414852473884821 ], [ -4339715.385359331965446, 7442961.49750720243901 ], [ -4247826.534178294241428, 7405378.32000738568604 ], [ -4156854.957871247082949, 7367880.07575336843729 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T022", "vessel": "Vanua I", "survey_date": "2025-08-15T00:00:00", "crosses_antimeridian_flag": false, "length_m": 66018.4566335868 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4290373.67644941713661, 7411969.506152883172035 ], [ -4284262.951733545400202, 7423280.151753674261272 ], [ -4278368.822872160933912, 7435430.017478138208389 ], [ -4272225.438446197658777, 7446713.317690638825297 ], [ -4266477.219423810951412, 7459509.236932834610343 ], [ -4260280.488234144635499, 7470690.401950720697641 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T023", "vessel": "Lomaiviti", "survey_date": "2025-08-12T00:00:00", "crosses_antimeridian_flag": false, "length_m": 99434.640040401122 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -3561531.550839005503803, 7613272.104708673432469 ], [ -3577690.090686303097755, 7601348.943141364492476 ], [ -3594036.502204718068242, 7590229.953301530331373 ], [ -3610777.861766006797552, 7580801.746638044714928 ], [ -3626666.002666668500751, 7567601.691654571332037 ], [ -3643087.810354783665389, 7556694.620280769653618 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T024", "vessel": "Vanua I", "survey_date": "2025-08-12T00:00:00", "crosses_antimeridian_flag": false, "length_m": 306700.81760221143 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -3829965.167181461118162, 7668176.042211830615997 ], [ -3767862.083356587216258, 7666414.750467590987682 ], [ -3706092.278463845141232, 7664256.13918883074075 ], [ -3644837.109403938986361, 7662548.670569711364806 ], [ -3584257.482800531201065, 7662082.654382421635091 ], [ -3523444.398040698841214, 7658740.193409200757742 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T025", "vessel": "Taveuni II", "survey_date": "2025-08-19T00:00:00", "crosses_antimeridian_flag": false, "length_m": 141676.28992404131 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4346307.113309009000659, 7335661.405004529282451 ], [ -4358893.576485850848258, 7380368.914957183413208 ], [ -4371676.896148102357984, 7426576.505353206768632 ], [ -4384070.571196650154889, 7472211.062794471159577 ] ] ] } },
0:35
Bash
# Check the last few features to see if they are MultiLineStrings
# Check the last few features to see if they are MultiLineStrings tail -n 50 fiji_transects_fmg.geojson
{
"type": "FeatureCollection",
"name": "fiji_transects_fmg",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:EPSG::2978" } },
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{ "type": "Feature", "properties": { "transect_id": "T006", "vessel": "Cakaulevu", "survey_date": "2025-08-13T00:00:00", "crosses_antimeridian_flag": true, "length_m": 407754.60135591205 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4072013.386766273528337, 7388770.954151820391417 ], [ -4003641.895763976499438, 7435495.569693414494395 ], [ -3935118.956585772335529, 7480783.979957517236471 ] ], [ [ -3866939.571860702708364, 7526575.426824647001922 ], [ -3798506.913532365113497, 7570462.772388414479792 ], [ -3730371.628425966016948, 7614711.890129117295146 ], [ -3661909.508072525262833, 7656612.145196046680212 ] ] ] } },
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{ "type": "Feature", "properties": { "transect_id": "T012", "vessel": "Taveuni II", "survey_date": "2025-08-20T00:00:00", "crosses_antimeridian_flag": false, "length_m": 110759.82324191679 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4391164.571518260985613, 7360320.613502792082727 ], [ -4394530.046042621135712, 7397650.021330628544092 ], [ -4397657.184081426821649, 7434726.764913761988282 ], [ -4400317.445971770212054, 7470699.160521874204278 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T013", "vessel": "Bligh", "survey_date": "2025-08-19T00:00:00", "crosses_antimeridian_flag": false, "length_m": 217667.98690759443 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -3500634.66661041136831, 7624488.529779511503875 ], [ -3555019.78079743264243, 7576273.736240705475211 ], [ -3609635.98526506870985, 7529185.577286700718105 ], [ -3663853.314219099935144, 7480489.774256192147732 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T014", "vessel": "Lomaiviti", "survey_date": "2025-08-13T00:00:00", "crosses_antimeridian_flag": false, "length_m": 192985.46945932449 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4413774.153938710689545, 7562150.586639955639839 ], [ -4365658.892802538350224, 7556679.867402884177864 ], [ -4317929.406769572757185, 7551632.806110155768692 ], [ -4269506.442580503411591, 7542865.706725970841944 ], [ -4222392.127146146260202, 7538103.418793024495244 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T015", "vessel": "Vanua I", "survey_date": "2025-08-15T00:00:00", "crosses_antimeridian_flag": false, "length_m": 152272.26172544161 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -3599741.177476593758911, 7736212.745857689529657 ], [ -3623035.573182810563594, 7726141.690671050921082 ], [ -3646682.824379864614457, 7717526.470636084675789 ], [ -3670190.43756432691589, 7708062.71239205263555 ], [ -3693556.10919238999486, 7697759.517956076189876 ], [ -3717019.016520280390978, 7687716.44325372390449 ], [ -3740853.234124850481749, 7679150.475810619071126 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T016", "vessel": "Taveuni II", "survey_date": "2025-08-15T00:00:00", "crosses_antimeridian_flag": false, "length_m": 67656.12720294467 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4100682.025228454731405, 7403861.670867463573813 ], [ -4084495.422882405109704, 7408737.328602271154523 ], [ -4067970.726826228201389, 7412243.751201774924994 ], [ -4051150.533411594107747, 7414525.191715514287353 ], [ -4035286.142096712253988, 7420304.588720072060823 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T017", "vessel": "Taveuni II", "survey_date": "2025-08-12T00:00:00", "crosses_antimeridian_flag": false, "length_m": 184670.49256340988 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -3561712.670831091701984, 7762173.437280626036227 ], [ -3571770.743310764431953, 7732279.147927755489945 ], [ -3582115.905092332046479, 7704162.682494780048728 ], [ -3591960.86162349069491, 7674129.711269719526172 ], [ -3602016.852133523207158, 7645485.724518963135779 ], [ -3612005.26394061697647, 7616929.932320784777403 ], [ -3621715.642344930209219, 7587537.784111866727471 ] ] ] } },
{ "type": "Feature", "properties": { "transect_id": "T018", "vessel": "Bligh", "survey_date": "2025-08-19T00:00:00", "crosses_antimeridian_flag": false, "length_m": 147355.0571320235 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -4462123.444380414672196, 7510544.93428553827107 ], [ -4430710.601116840727627, 7491378.522975526750088 ], [ -4399257.654556686989963, 7471766.769270030781627 ], [ -4368137.635694316588342, 7453077.762156526558101 ], [ -4336752.643661714158952, 7433126.185787387192249 ] ] ] } },
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0:47