isochrone

Travel-time contours from a block or point

Travel-time contours around a census block (by GEOID) or a lat/lon point. Supply block XOR lon+lat, and minutes XOR contours (up to 4 ascending levels). format=geojson returns contour polygons (largest first); format=blocks returns the reachable blocks with their travel minutes. Metered at 10 tokens per contour level with a ck_ key; unmetered for a Close+ member mt_ bearer.

get/v1/isochrone

Request

  • Base URL: https://api.close.city
  • URL: https://api.close.city/v1/isochrone
  • Auth: HTTP bearer

Query parameters

blockstring nullable

15-digit census block GEOID

lonnumber nullable

Longitude (WGS84)

latnumber nullable

Latitude (WGS84)

modestring

walk | bike | transit

directionstring

to | from

minutesinteger nullable

Single threshold, 1-60

contoursstring nullable

Up to 4 ascending thresholds, e.g. 15,30,45

formatstring

geojson | blocks

vstring nullable

Opaque CDN cache-buster; echoed

Response

Successful Response

OR

Example response

{
  "assumptions": {
    "max_trip_duration_min": 60,
    "transit_departure": "2026-07-15T08:00:00",
    "transit_percentile": 10,
    "transit_window_min": 60
  },
  "features": [
    {
      "type": "Feature"
    }
  ],
  "type": "FeatureCollection"
}

Changes

No recorded changes to this operation across all 1 revision of this API.