Generate drive/bike/walk isochrone polygons with the Valhalla /isochrone service
domain: valhalla.github.io · 4 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
POST or GET the /isochrone endpoint with locations, a costing model (auto, bicycle, or pedestrian), and a contours array of {time, color} objects
Set polygons=true to receive GeoJSON Polygon/MultiPolygon contours instead of the default linestrings
Limit requests to at most 4 contour levels
Tune per-mode behavior with costing_options alongside the chosen costing model
Known gotchas
overlapping polygon contours are not clipped — outer contours include the area of inner contours, so opacity/z-order must be handled by the client
polygons=false (the default) returning lines is intentionally recommended since polygon overlap requires manual handling
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