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API Reference
Routing

Calculate an isochrone from a point

RoutingIsochronePostResponse Routing.IsochronePost(RoutingIsochronePostParamsparameters, CancellationTokencancellationToken = default)
POST/api/v1/isochrone

Calculate an isochrone from a point

ParametersExpand Collapse
RoutingIsochronePostParams parameters
required Double lat

Latitude

required Double lng

Longitude

required Double time

Travel time in seconds (1-7200)

string format

Response format: json (default), geojson, csv, ndjson

string mode

Travel mode (auto, foot, bicycle)

string outputFields

Comma-separated property fields to include

Boolean outputGeometry

Include geometry (default true)

string outputInclude

Extra computed fields: bbox, center

Long outputPrecision

Coordinate decimal precision (1-15, default 7)

Double outputSimplify

Simplify geometry tolerance in meters

ReturnsExpand Collapse
class RoutingIsochronePostResponse:

GeoJSON Feature or FeatureCollection representing isochrone polygons — areas reachable within the specified travel time(s). Single time value returns a Feature; comma-separated times return a FeatureCollection with one polygon per contour.

IReadOnlyList<GeoJsonFeature>? Features

Array of isochrone polygon Features (multi-contour only)

required GeoJsonGeometry Geometry

GeoJSON Geometry object per RFC 7946. Coordinates use [longitude, latitude] order. 3D coordinates [lng, lat, elevation] are used for elevation endpoints.

required Coordinates Coordinates

Coordinates array. Nesting depth varies by geometry type: Point = [lng, lat], LineString = [[lng, lat], ...], Polygon = [[[lng, lat], ...], ...], etc.

One of the following:
IReadOnlyList<Double>
IReadOnlyList<IReadOnlyList<Double>>
IReadOnlyList<IReadOnlyList<IReadOnlyList<Double>>>
IReadOnlyList<IReadOnlyList<IReadOnlyList<IReadOnlyList<Double>>>>
required Type Type

Geometry type

One of the following:
"Point"Point
"LineString"LineString
"Polygon"Polygon
"MultiPoint"MultiPoint
"MultiLineString"MultiLineString
"MultiPolygon"MultiPolygon
required IReadOnlyDictionary<string, JsonElement> Properties

OSM tags flattened as key-value pairs, plus @type (node/way/relation) and @id (OSM ID) metadata fields. May include distance_m for proximity queries.

required Type Type

Always Feature

string ID

Compound identifier in type/osm_id format

GeoJsonGeometry? Geometry

GeoJSON Geometry object per RFC 7946. Coordinates use [longitude, latitude] order. 3D coordinates [lng, lat, elevation] are used for elevation endpoints.

required Coordinates Coordinates

Coordinates array. Nesting depth varies by geometry type: Point = [lng, lat], LineString = [[lng, lat], ...], Polygon = [[[lng, lat], ...], ...], etc.

One of the following:
IReadOnlyList<Double>
IReadOnlyList<IReadOnlyList<Double>>
IReadOnlyList<IReadOnlyList<IReadOnlyList<Double>>>
IReadOnlyList<IReadOnlyList<IReadOnlyList<IReadOnlyList<Double>>>>
required Type Type

Geometry type

One of the following:
"Point"Point
"LineString"LineString
"Polygon"Polygon
"MultiPoint"MultiPoint
"MultiLineString"MultiLineString
"MultiPolygon"MultiPolygon
Properties? Properties

Isochrone metadata

Double? AreaM2

Area of the isochrone polygon in square meters (multi-contour features only)

Double? MaxCostS

Maximum actual travel cost in seconds to the isochrone boundary (single contour only)

Mode Mode

Travel mode used for the isochrone calculation

One of the following:
"auto"Auto
"foot"Foot
"bicycle"Bicycle
Double TimeSeconds

Travel time budget in seconds

Long VerticesReached

Number of road network vertices within the isochrone

Type Type

Feature for single contour, FeatureCollection for multiple contours

One of the following:
"Feature"Feature
"FeatureCollection"FeatureCollection

Calculate an isochrone from a point

RoutingIsochronePostParams parameters = new()
{
    Lat = 0,
    Lng = 0,
    Time = 0,
};

var response = await client.Routing.IsochronePost(parameters);

Console.WriteLine(response);
{
  "features": [
    {
      "geometry": {
        "coordinates": [
          2.3522,
          48.8566
        ],
        "type": "Point"
      },
      "properties": {
        "@id": "bar",
        "@type": "bar",
        "amenity": "bar",
        "cuisine": "bar",
        "name": "bar"
      },
      "type": "Feature",
      "id": "node/21154906"
    }
  ],
  "geometry": {
    "coordinates": [
      2.3522,
      48.8566
    ],
    "type": "Point"
  },
  "properties": {
    "area_m2": 0,
    "max_cost_s": 0,
    "mode": "auto",
    "time_seconds": 0,
    "vertices_reached": 0
  },
  "type": "Feature"
}
Returns Examples
{
  "features": [
    {
      "geometry": {
        "coordinates": [
          2.3522,
          48.8566
        ],
        "type": "Point"
      },
      "properties": {
        "@id": "bar",
        "@type": "bar",
        "amenity": "bar",
        "cuisine": "bar",
        "name": "bar"
      },
      "type": "Feature",
      "id": "node/21154906"
    }
  ],
  "geometry": {
    "coordinates": [
      2.3522,
      48.8566
    ],
    "type": "Point"
  },
  "properties": {
    "area_m2": 0,
    "max_cost_s": 0,
    "mode": "auto",
    "time_seconds": 0,
    "vertices_reached": 0
  },
  "type": "Feature"
}