dc-l1-capetown-waterway-nulls

Status: done

Score: 0.586

Duration: 0:24

Cost: 0.22¢

Model: google/gemma-4-26b-a4b-it

Map (reference ← swipe → agent)

0:00

Hi, first time asking for help with this. The contractor delivered capetown_waterways.geojson but some features are unusable for our mapping pipeline. Drop any features that cannot represent a valid, usable waterway (a feature needs both a drawable geometry and a proper type to be useful) and keep the rest. I'd also like a top-level dropped_count so I can show my supervisor what we're flagging back at the contractor. Filename waterways_clean.geojson, please. The output should contain only LineString features, each preserving all original columns, with feature_id as the key field. The FeatureCollection must include a top-level dropped_count foreign member (an integer) reporting how many features were removed.

0:00

System info

{
  "adapter": "openrouter",
  "model": "google/gemma-4-26b-a4b-it",
  "base_url": "https://openrouter.ai/api/v1"
}

0:01

Bash ls -F

capetown_waterways.geojson

0:13

Write /work/solve.py

content · 59 lines · py

import geopandas as gpd
import json

def clean_waterways(input_file, output_file):
    # Load the input file
    gdf = gpd.read_file(input_file)
    
    initial_count = len(gdf)
    
    # 1. Filter for LineString features only. 
    # Note: MultiLineString might also be considered 'waterways', 
    # but the prompt says "only LineString features". 
    # I will interpret this strictly as LineString, but I'll check if MultiLineString 
    # should be included. Usually, in GIS, "LineString" implies the geometry type.
    # However, the prompt says "only LineString features".
    
    # Filter for LineString geometry type
    # We also check for validity and non-empty geometry.
    
    def is_valid_linestring(geom):
        if geom is None:
            return False
        # Check if it is LineString. If they meant LineString OR MultiLineString, 
        # they usually say "Line" or "Linear" features.
        # I'll stick to LineString as requested.
        if geom.geom_type != 'LineString':
            return False
        if not geom.is_valid or geom.is_empty:
            return False
        return True

    mask = gdf.geometry.apply(is_valid_linestring)
    gdf_clean = gdf[mask].copy()
    
    dropped_count = initial_count - len(gdf_clean)
    
    # Prepare the output GeoJSON structure
    # The prompt asks for:
    # 1. FeatureCollection containing the cleaned features.
    # 2. A top-level "dropped_count" foreign member.
    
    # Convert cleaned GeoDataFrame to a GeoJSON dictionary
    # Note: gdf.to_json() returns a string.
    geojson_dict = json.loads(gdf_clean.to_json())
    
    # Add the top-level dropped_count
    geojson_dict['dropped_count'] = dropped_count
    
    # Write to output file
    with open(output_file, 'w') as f:
        json.dump(geojson_dict, f)

    print(f"Initial count: {initial_count}")
    print(f"Cleaned count: {len(gdf_clean)}")
    print(f"Dropped count: {dropped_count}")

if __name__ == "__main__":
    clean_waterways('capetown_waterways.geojson', 'waterways_clean.geojson')

Wrote /work/solve.py (2052 chars).

0:14

Bash python solve.py

Initial count: 100
Cleaned count: 85
Dropped count: 15

0:16

Bash head -n 20 waterways_clean.geojson

{"type": "FeatureCollection", "features": [{"id": "15", "type": "Feature", "properties": {"feature_id": 16, "name": "Steenbras Stream", "waterway_type": null}, "geometry": {"type": "LineString", "coordinates": [[18.675131, -34.097358], [18.644434, -34.095261], [18.593333, -34.054287]]}}, {"id": "16", "type": "Feature", "properties": {"feature_id": 17, "name": "Sir Lowry Stream", "waterway_type": null}, "geometry": {"type": "LineString", "coordinates": [[18.476831, -34.056422], [18.432213, -34.00126], [18.38696, -33.920017]]}}, {"id": "17", "type": "Feature", "properties": {"feature_id": 18, "name": "Constantia River", "waterway_type": null}, "geometry": {"type": "LineString", "coordinates": [[18.350029, -33.922963], [18.357716, -33.862693], [18.38548, -33.811815]]}}, {"id": "18", "type": "Feature", "properties": {"feature_id": 19, "name": "Klipfontein Stream", "waterway_type": null}, "geometry": {"type": "LineString", "coordinates": [[18.482936, -33.81301], [18.531519, -33.800031], [18.591089, -33.823751]]}}, {"id": "19", "type": "Feature", "properties": {"feature_id": 20, "name": "Plumstead Stream", "waterway_type": null}, "geometry": {"type": "LineString", "coordinates": [[18.678279, -33.822156], [18.695646, -33.867752], [18.698602, -33.945448]]}}, {"id": "20", "type": "Feature", "properties": {"feature_id": 21, "name": null, "waterway_type": "river"}, "geometry": {"type": "LineString", "coordinates": [[18.64611, -33.94245], [18.606483, -34.006979], [18.548438, -34.071103]]}}, {"id": "21", "type": "Feature", "properties": {"feature_id": 22, "name": null, "waterway_type": "drain"}, "geometry": {"type": "LineString", "coordinates": [[18.434177, -34.069308], [18.396375, -34.096669], [18.363484, -34.091471]]}}, {"id": "22", "type": "Feature", "properties": {"feature_id": 23, "name": null, "waterway_type": "canal"}, "geometry": {"type": "LineString", "coordinates": [[18.357053, -34.092439], [18.377185, -34.058844], [18.418269, -33.988844]]}}, {"id": "23", "type": "Feature", "properties": {"feature_id": 24, "name": null, "waterway_type": "ditch"}, "geometry": {"type": "LineString", "coordinates": [[18.529212, -33.991734], [18.577397, -33.92639], [18.631474, -33.852446]]}}, {"id": "24", "type": "Feature", "properties": {"feature_id": 25, "name": null, "waterway_type": "stream"}, "geometry": {"type": "LineString", "coordinates": [[18.69512, -33.854745], [18.699836, -33.814463], [18.68664, -33.800862]]}}, {"id": "25", "type": "Feature", "properties": {"feature_id": 26, "name": "Liesbeek Stream", "waterway_type": "river"}, "geometry": {"type": "LineString", "coordinates": [[18.608518, -33.800571], [18.562766, -33.820372], [18.501884, -33.878938]]}}, {"id": "26", "type": "Feature", "properties": {"feature_id": 27, "name": "Black River River", "waterway_type": "drain"}, "geometry": {"type": "LineString", "coordinates": [[18.397951, -33.876311], [18.36964, -33.938979], [18.351439, -34.018796]]}}, {"id": "27", "type": "Feature", "properties": {"feature_id": 28, "name": "Salt Stream", "waterway_type": "canal"}, "geometry": {"type": "LineString", "coordinates": [[18.375963, -34.016116], [18.407114, -34.067168], [18.458611, -34.098842]]}}, {"id": "28", "type": "Feature", "properties": {"feature_id": 29, "name": "Diep Stream", "waterway_type": "ditch"}, "geometry": {"type": "LineString", "coordinates": [[18.575191, -34.09844], [18.619566, -34.093491], [18.664324, -34.049485]]}}, {"id": "29", "type": "Feature", "properties": {"feature_id": 30, "name": "Eerste River", "waterway_type": "stream"}, "geometry": {"type": "LineString", "coordinates": [[18.699921, -34.05171], [18.691653, -33.995063], [18.663239, -33.913635]]}}, {"id": "30", "type": "Feature", "properties": {"feature_id": 31, "name": "Lourens Stream", "waterway_type": "river"}, "geometry": {"type": "LineString", "coordinates": [[18.565016, -33.916553], [18.516377, -33.857457], [18.456965, -33.809401]]}}, {"id": "31", "type": "Feature", "properties": {"feature_id": 32, "name": "Hout Bay Stream", "waterway_type": "drain"}, "geometry": {"type": "LineString", "coordinates": [[18.370716, -33.810475], [18.3539, -33.800308], [18.351676, -33.827404]]}}, {"id": "32", "type": "Feature", "properties": {"feature_id": 33, "name": "Disa River", "waterway_type": "canal"}, "geometry": {"type": "LineString", "coordinates": [[18.405419, -33.8257], [18.445387, -33.873302], [18.503651, -33.951992]]}}, {"id": "33", "type": "Feature", "properties": {"feature_id": 34, "name": "Sand Stream", "waterway_type": "ditch"}, "geometry": {"type": "LineString", "coordinates": [[18.617617, -33.948992], [18.655044, -34.012977], [18.687315, -34.074848]]}}, {"id": "34", "type": "Feature", "properties": {"feature_id": 35, "name": "Soet Stream", "waterway_type": "stream"}, "geometry": {"type": "LineString", "coordinates": [[18.692343, -34.07316], [18.671677, -34.0979], [18.630054, -34.089161]]}}, {"id": "35", "type": "Feature", "properties": {"feature_id": 36, "name": "Klein Liesbeek River", "waterway_type": "river"}, "geometry": {"type": "LineString", "coordinates": [[18.518682, -34.090253], [18.470597, -34.054239], [18.416862, -33.982488]]}}, {"id": "36", "type": "Feature", "properties": {"feature_id": 37, "name": "Kuils Stream", "waterway_type": "drain"}, "geometry": {"type": "LineString", "coordinates": [[18.354399, -33.98541], [18.350268, -33.919952], [18.364179, -33.847569]]}}, {"id": "37", "type": "Feature", "properties": {"feature_id": 38, "name": "Modder Stream", "waterway_type": "canal"}, "geometry": {"type": "LineString", "coordinates": [[18.443339, -33.849781], [18.489293, -33.811789], [18.550203, -33.801704]]}}, {"id": "38", "type": "Feature", "properties": {"feature_id": 39, "name": "Princess Vlei River", "waterway_type": "ditch"}, "geometry": {"type": "LineString", "coordinates": [[18.653489, -33.801283], [18.681318, -33.823787], [18.698818, -33.884768]]}}, {"id": "39", "type": "Feature", "properties": {"feature_id": 40, "name": "Riet Stream", "waterway_type": "stream"}, "geometry": {"type": "LineString", "coordinates": [[18.672923, -33.882079], [18.64132, -33.945514], [18.589435, -34.024544]]}}, {"id": "40", "type": "Feature", "properties": {"feature_id": 41, "name": "Schaapen Stream", "waterway_type": "river"}, "geometry": {"type": "LineString", "coordinates": [[18.472795, -34.021926], [18.428668, -34.071142], [18.384411, -34.099512]]}}, {"id": "41", "type": "Feature", "properties": {"feature_id": 42, "name": "Steenbras River", "waterway_type": "drain"}, "geometry": {"type": "LineString", "coordinates": [[18.350155, -34.09924], [18.359001, -34.091448], [18.388063, -34.044494]]}}, {"id": "42", "type": "Feature", "properties": {"feature_id": 43, "name": "Sir Lowry Stream", "waterway_type": "canal"}, "geometry": {"type": "LineString", "coordinates": [[18.487037, -34.046805], [18.535726, -33.98878], [18.59497, -33.907323]]}}, {"id": "43", "type": "Feature", "properties": {"feature_id": 44, "name": "Constantia Stream", "waterway_type": "ditch"}, "geometry": {"type": "LineString", "coordinates": [[18.680267, -33.910207], [18.69653, -33.852396], [18.698021, -33.807255]]}}, {"id": "44", "type": "Feature", "properties": {"feature_id": 45, "name": "Klipfontein River", "waterway_type": "stream"}, "geometry": {"type": "LineString", "coordinates": [[18.643034, -33.808206], [18.602732, -33.800869], [18.544256, -33.83129]]}}, {"id": "45", "type": "Feature", "properties": {"feature_id": 46, "name": "Plumstead Stream", "waterway_type": "river"}, "geometry": {"type": "LineString", "coordinates": [[18.430603, -33.82948], [18.393556, -33.878997], [18.36191, -33.958531]]}}, {"id": "46", "type": "Feature", "properties": {"feature_id": 47, "name": "Camps Bay Stream", "waterway_type": "drain"}, "geometry": {"type": "LineString", "coordinates": [[18.358285, -33.955535], [18.379483, -34.018855], [18.421638, -34.078355]]}}, {"id": "47", "type": "Feature", "properties": {"feature_id": 48, "name": "Bokramspruit River", "waterway_type": "canal"}, "geometry": {"type": "LineString", "coordinates": [[18.533422, -34.076777], [18.581401, -34.09885], [18.634786, -34.086587]]}}, {"id": "48", "type": "Feature", "properties": {"feature_id": 49, "name": "Mosselbank Stream", "waterway_type": "ditch"}, "geometry": {"type": "LineString", "coordinates": [[18.696058, -34.0878], [18.699603, -34.049435], [18.684979, -33.97607]]}}, {"id": "49", "type": "Feature", "properties": {"feature_id": 50, "name": "Skoolspruit Stream", "waterway_type": "stream"}, "geometry": {"type": "LineString", "coordinates": [[18.604792, -33.979019], [18.558642, -33.913571], [18.497715, -33.842887]]}}, {"id": "50", "type": "Feature", "properties": {"feature_id": 51, "name": "Vergenoegd River", "waterway_type": "river"}, "geometry": {"type": "LineString", "coordinates": [[18.395091, -33.845009], [18.367746, -33.809378], [18.35095, -33.802829]]}}, {"id": "51", "type": "Feature", "properties": {"feature_id": 52, "name": "Liesbeek Stream", "waterway_type": "drain"}, "geometry": {"type": "LineString", "coordinates": [[18.378214, -33.802278], [18.410262, -33.827442], [18.462528, -33.890721]]}}, {"id": "52", "type": "Feature", "properties": {"feature_id": 53, "name": "Black River Stream", "waterway_type": "canal"}, "geometry": {"type": "LineString", "coordinates": [[18.579211, -33.887977], [18.623083, -33.952058], [18.666833, -34.03015]]}}, {"id": "53", "type": "Feature", "properties": {"feature_id": 54, "name": "Salt River", "waterway_type": "ditch"}, "geometry": {"type": "LineString", "coordinates": [[18.699743, -34.027599], [18.69032, -34.074885], [18.660616, -34.099897]]}}, {"id": "54", "type": "Feature", "properties": {"feature_id": 55, "name": "Diep Stream", "waterway_type": "stream"}, "geometry": {"type": "LineString", "coordinates": [[18.560904, -34.099756], [18.512172, -34.089136], [18.453104, -34.039323]]}}, {"id": "55", "type": "Feature", "properties": {"feature_id": 56, "name": "Eerste Stream", "waterway_type": "river"}, "geometry": {"type": "LineString", "coordinates": [[18.368772, -34.041715], [18.353065, -33.982423], [18.352308, -33.901092]]}}, {"id": "56", "type": "Feature", "properties": {"feature_id": 57, "name": "Lourens River", "waterway_type": "drain"}, "geometry": {"type": "LineString", "coordinates": [[18.40853, -33.903937], [18.449161, -33.847521], [18.507838, -33.805381]]}}, {"id": "57", "type": "Feature", "properties": {"feature_id": 58, "name": "Hout Bay Stream", "waterway_type": "canal"}, "geometry": {"type": "LineString", "coordinates": [[18.621164, -33.806206], [18.657825, -33.801714], [18.688842, -33.835403]]}}, {"id": "58", "type": "Feature", "properties": {"feature_id": 59, "name": "Disa Stream", "waterway_type": "ditch"}, "geometry": {"type": "LineString", "coordinates": [[18.691062, -33.83349], [18.669337, -33.884828], [18.626655, -33.965055]]}}, {"id": "59", "type": "Feature", "properties": {"feature_id": 60, "name": "Sand River", "waterway_type": "stream"}, "geometry": {"type": "LineString", "coordinates": [[18.514474, -33.962067], [18.466609, -34.024602], [18.413581, -34.081619]]}}, {"id": "60", "type": "Feature", "properties": {"feature_id": 61, "name": "Soet Stream", "waterway_type": "river"}, "geometry": {"type": "LineString", "coordinates": [[18.35351, -34.080153], [18.350551, -34.099517], [18.365886, -34.083753]]}}, {"id": "61", "type": "Feature", "properties": {"feature_id": 62, "name": "Klein Liesbeek Stream", "waterway_type": "drain"}, "geometry": {"type": "LineString", "coordinates": [[18.447088, -34.085084], [18.493427, -34.044442], [18.554364, -33.969602]]}}, {"id": "62", "type": "Feature", "properties": {"feature_id": 63, "name": "Kuils River", "waterway_type": "canal"}, "geometry": {"type": "LineString", "coordinates": [[18.656311, -33.972572], [18.683167, -33.907259], [18.699257, -33.838409]]}}, {"id": "63", "type": "Feature", "properties": {"feature_id": 64, "name": "Modder Stream", "waterway_type": "ditch"}, "geometry": {"type": "LineString", "coordinates": [[18.670629, -33.840436], [18.638139, -33.807235], [18.5855, -33.804233]]}}, {"id": "64", "type": "Feature", "properties": {"feature_id": 65, "name": "Princess Vlei Stream", "waterway_type": "stream"}, "geometry": {"type": "LineString", "coordinates": [[18.46879, -33.803555], [18.425179, -33.831331], [18.381943, -33.896787]]}}, {"id": "65", "type": "Feature", "properties": {"feature_id": 66, "name": "Riet River", "waterway_type": "river"}, "geometry": {"type": "LineString", "coordinates": [[18.350383, -33.893993], [18.360383, -33.958598], [18.390725, -34.035604]]}}, {"id": "66", "type": "Feature", "properties": {"feature_id": 67, "name": "Schaapen Stream", "waterway_type": "drain"}, "geometry": {"type": "LineString", "coordinates": [[18.491161, -34.033124], [18.539928, -34.07839], [18.598811, -34.099997]]}}, {"id": "67", "type": "Feature", "properties": {"feature_id": 68, "name": "Steenbras Stream", "waterway_type": "canal"}, "geometry": {"type": "LineString", "coordinates": [[18.682166, -34.099986], [18.697315, -34.08656], [18.697339, -34.033982]]}}, {"id": "68", "type": "Feature", "properties": {"feature_id": 69, "name": "Sir Lowry River", "waterway_type": "ditch"}, "geometry": {"type": "LineString", "coordinates": [[18.63989, -34.036451], [18.598935, -33.976004], [18.540064, -33.894953]]}}, {"id": "69", "type": "Feature", "properties": {"feature_id": 70, "name": "Constantia Stream", "waterway_type": "stream"}, "geometry": {"type": "LineString", "coordinates": [[18.427083, -33.897755], [18.390813, -33.842841], [18.360429, -33.803782]]}}, {"id": "70", "type": "Feature", "properties": {"feature_id": 71, "name": "Klipfontein Stream", "waterway_type": "river"}, "geometry": {"type": "LineString", "coordinates": [[18.359614, -33.804481], [18.381865, -33.802842], [18.425067, -33.839733]]}}, {"id": "71", "type": "Feature", "properties": {"feature_id": 72, "name": "Plumstead River", "waterway_type": "drain"}, "geometry": {"type": "LineString", "coordinates": [[18.537628, -33.837721], [18.585372, -33.890782], [18.638035, -33.97155]]}}, {"id": "72", "type": "Feature", "properties": {"feature_id": 73, "name": "Camps Bay Stream", "waterway_type": "canal"}, "geometry": {"type": "LineString", "coordinates": [[18.696898, -33.968577], [18.699269, -34.030207], [18.683225, -34.084631]]}}, {"id": "73", "type": "Feature", "properties": {"feature_id": 74, "name": "Bokramspruit Stream", "waterway_type": "ditch"}, "geometry": {"type": "LineString", "coordinates": [[18.60102, -34.083282], [18.554499, -34.099899], [18.493562, -34.080664]]}}, {"id": "74", "type": "Feature", "properties": {"feature_id": 75, "name": "Mosselbank River", "waterway_type": "stream"}, "geometry": {"type": "LineString", "coordinates": [[18.392306, -34.082111], [18.365943, -34.039269], [18.350562, -33.963097]]}}, {"id": "75", "type": "Feature", "properties": {"feature_id": 76, "name": "Skoolspruit Stream", "waterway_type": "river"}, "geometry": {"type": "LineString", "coordinates": [[18.38055, -33.966083], [18.413476, -33.901029], [18.466481, -33.834144]]}}, {"id": "76", "type": "Feature", "properties": {"feature_id": 77, "name": "Vergenoegd Stream", "waterway_type": "drain"}, "geometry": {"type": "LineString", "coordinates": [[18.583201, -33.836072], [18.626544, -33.805364], [18.669259, -33.805916]]}}, {"id": "77", "type": "Feature", "properties": {"feature_id": 78, "name": "Liesbeek River", "waterway_type": "canal"}, "geometry": {"type": "LineString", "coordinates": [[18.699465, -33.80511], [18.68889, -33.835446], [18.657914, -33.902955]]}}, {"id": "78", "type": "Feature", "properties": {"feature_id": 79, "name": "Black River Stream", "waterway_type": "ditch"}, "geometry": {"type": "LineString", "coordinates": [[18.55677, -33.900116], [18.507975, -33.965121], [18.449284, -34.040895]]}}, {"id": "79", "type": "Feature", "properties": {"feature_id": 80, "name": "Salt Stream", "waterway_type": "stream"}, "geometry": {"type": "LineString", "coordinates": [[18.366919, -34.03849], [18.35233, -34.081651], [18.353039, -34.099811]]}}, {"id": "80", "type": "Feature", "properties": {"feature_id": 81, "name": "Diep River", "waterway_type": "river"}, "geometry": {"type": "LineString", "coordinates": [[18.411707, -34.099932], [18.452979, -34.083723], [18.512036, -34.028481]]}}, {"id": "81", "type": "Feature", "properties": {"feature_id": 82, "name": "Eerste Stream", "waterway_type": "drain"}, "geometry": {"type": "LineString", "coordinates": [[18.624656, -34.031022], [18.660529, -33.969536], [18.690275, -33.88892]]}}, {"id": "82", "type": "Feature", "properties": {"feature_id": 83, "name": "Lourens Stream", "waterway_type": "canal"}, "geometry": {"type": "LineString", "coordinates": [[18.689685, -33.891672], [18.666913, -33.838365], [18.623197, -33.802461]]}}, {"id": "83", "type": "Feature", "properties": {"feature_id": 84, "name": "Hout Bay River", "waterway_type": "ditch"}, "geometry": {"type": "LineString", "coordinates": [[18.510272, -33.803032], [18.462655, -33.804249], [18.410365, -33.844273]]}}, {"id": "84", "type": "Feature", "properties": {"feature_id": 85, "name": "Disa Stream", "waterway_type": "stream"}, "geometry": {"type": "LineString", "coordinates": [[18.35272, -33.842166], [18.350936, -33.896849], [18.367686, -33.978004]]}}, {"id": "85", "type": "Feature", "properties": {"feature_id": 86, "name": "Sand Stream", "waterway_type": "river"}, "geometry": {"type": "LineString", "coordinates": [[18.450883, -33.975051], [18.49758, -34.035659], [18.558508, -34.087388]]}}, {"id": "86", "type": "Feature", "properties": {"feature_id": 87, "name": "Soet River", "waterway_type": "drain"}, "geometry": {"type": "LineString", "coordinates": [[18.659058, -34.086157], [18.684924, -34.099996], [18.699594, -34.077327]]}}, {"id": "87", "type": "Feature", "properties": {"feature_id": 88, "name": "Klein Liesbeek Stream", "waterway_type": "canal"}, "geometry": {"type": "LineString", "coordinates": 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0:22

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dc-l1-capetown-waterway-nulls

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dc-l1-capetown-waterway-nulls