H3 Res 7 • OSM • Euclidean distance to nearest highway / major road
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Use this data via API
POST an area of interest • get population-weighted distance-to-road back
Beyond viewing the map, you can query this dataset programmatically for your own area — a neighborhood boundary, a study catchment, any custom shapefile — instead of reading values off the map by hand. Every request needs an API key sent as an X-API-Key header.
POST /precise-api/api/euclidean/query
Population-weighted distance to the nearest highway (hw) and major road (mr) for a custom AOI. Submit a GeoJSON polygon or a zipped shapefile (.shp/.dbf/.shx). Add ?include_cells=true to also get the matched H3 cells back as GeoJSON.
curl -X POST https://portal.placealert.org/precise-api/api/euclidean/query \
-H "X-API-Key: YOUR_KEY" \
-F 'geojson={"type":"Polygon","coordinates":[[[27.4,-29.4],[27.6,-29.4],[27.6,-29.2],[27.4,-29.2],[27.4,-29.4]]]}'
# or a zipped shapefile instead of geojson:
curl -X POST https://portal.placealert.org/precise-api/api/euclidean/query \
-H "X-API-Key: YOUR_KEY" \
-F "shapefile=@my_area.zip"
GET /precise-api/api/euclidean/admin?iso3=ZWE&level=2&name=Harare
Instant lookup of precomputed values for named admin units (levels 1–3, roughly country/province/district) — no computation, filter by country and/or name.
GET /precise-api/api/geo/countries
No API key required — lists the 57 supported countries, so you can confirm coverage before building a request.
Don't have a key yet? Request one:
All responses are JSON.
Loading overview…
Africa overview · H3 res 4
Highway dist
Major road dist
H3 cell
Analyze my area
Click the map to place points, then finish the shape. ~5 km² per hexagon, so keep it neighborhood/study-area scale.
Upload a GeoJSON (.geojson/.json) or a zipped shapefile (.zip with .shp/.dbf/.shx).