# Compute an isochrone

Endpoint: GET /isochrone
Version: 1.0.0
Security: key

## Query parameters:

  - `point` (string, required)
    Specify the start coordinate

  - `time_limit` (integer)
    Specify which time the vehicle should travel. In seconds.

  - `distance_limit` (integer)
    Specify which distance the vehicle should travel. In meters.

  - `profile` (string)
    The routing profile. It determines the network, speed and other physical attributes used when computing the route. See the section about routing profiles for more details and valid profile values.

  - `buckets` (integer)
    Number by which to divide the given time_limit to create buckets nested isochrones of time intervals time_limit-n*time_limit/buckets. Applies analogously to distance_limit.

  - `reverse_flow` (boolean)
    If false the flow goes from point to the polygon, if true the flow goes from the polygon "inside" to the point.
Example use case for false: How many potential customer can be reached within 30min travel time from your store vs. true: How many customers can reach your store within 30min travel time.

## Response 200 fields (application/json):

  - `polygons` (array)
    The list of polygons in GeoJson format. It can be used e.g. in the Leaflet framework:


L.geoJson(json.polygons).addTo(map)


The number of polygon is identical to the specified buckets in the query. Every polygon contains the bucket number in the properties section of the GeoJson.
    Example: [{"properties":{"bucket":0},"type":"Feature","geometry":{"type":"Polygon","coordinates":[[13.351851,52.51345],[13.350402,52.516949],[13.352598,52.522252],[13.351851,52.51345]]}}]

  - `polygons.properties` (object)

  - `polygons.properties.bucket` (integer)

  - `polygons.type` (string)

  - `polygons.geometry` (object)

  - `polygons.geometry.coordinates` (array)