## Calculate an isochrone from a point

`GeoJsonFeature Routing.Isochrone(RoutingIsochroneParamsparameters, CancellationTokencancellationToken = default)`

**get** `/api/v1/isochrone`

Calculate an isochrone from a point

### Parameters

- `RoutingIsochroneParams parameters`

  - `required Double lat`

    Latitude

  - `required Double lng`

    Longitude

  - `required Double time`

    Travel time in seconds (1-7200)

  - `string mode`

    Travel mode (auto, foot, bicycle)

### Returns

- `class GeoJsonFeature:`

  - `required GeoJsonGeometry Geometry`

    - `required Coordinates Coordinates`

      GeoJSON coordinates array (nesting depth varies by geometry type)

      - `IReadOnlyList<Double>`

      - `IReadOnlyList<IReadOnlyList<Double>>`

      - `IReadOnlyList<IReadOnlyList<IReadOnlyList<Double>>>`

      - `IReadOnlyList<IReadOnlyList<IReadOnlyList<IReadOnlyList<Double>>>>`

    - `required Type Type`

      - `"Point"Point`

      - `"LineString"LineString`

      - `"Polygon"Polygon`

      - `"MultiPoint"MultiPoint`

      - `"MultiLineString"MultiLineString`

      - `"MultiPolygon"MultiPolygon`

  - `required IReadOnlyDictionary<string, JsonElement> Properties`

  - `required Type Type`

    - `"Feature"Feature`

  - `string ID`

    Feature identifier (type/osm_id)

  - `Long OsmID`

    OpenStreetMap ID

### Example

```csharp
RoutingIsochroneParams parameters = new()
{
    Lat = 0,
    Lng = 0,
    Time = 0,
};

var geoJsonFeature = await client.Routing.Isochrone(parameters);

Console.WriteLine(geoJsonFeature);
```