## Calculate an isochrone from a point

`routing().isochronePost(RoutingIsochronePostParamsparams, RequestOptionsrequestOptions = RequestOptions.none()) : RoutingIsochronePostResponse`

**post** `/api/v1/isochrone`

Calculate an isochrone from a point

### Parameters

- `params: RoutingIsochronePostParams`

  - `lat: Double`

    Latitude

  - `lng: Double`

    Longitude

  - `time: Double`

    Travel time in seconds (1-7200)

  - `format: Optional<String>`

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

  - `mode: Optional<String>`

    Travel mode (auto, foot, bicycle)

  - `outputFields: Optional<String>`

    Comma-separated property fields to include

  - `outputGeometry: Optional<Boolean>`

    Include geometry (default true)

  - `outputInclude: Optional<String>`

    Extra computed fields: bbox, center

  - `outputPrecision: Optional<Long>`

    Coordinate decimal precision (1-15, default 7)

  - `outputSimplify: Optional<Double>`

    Simplify geometry tolerance in meters

### Returns

- `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.

  - `features: Optional<List<GeoJsonFeature>>`

    Array of isochrone polygon Features (multi-contour only)

    - `geometry: GeoJsonGeometry`

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

      - `coordinates: Coordinates`

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

        - `List<Double>`

        - `List<List<Double>>`

        - `List<List<List<Double>>>`

        - `List<List<List<List<Double>>>>`

      - `type: Type`

        Geometry type

        - `POINT("Point")`

        - `LINE_STRING("LineString")`

        - `POLYGON("Polygon")`

        - `MULTI_POINT("MultiPoint")`

        - `MULTI_LINE_STRING("MultiLineString")`

        - `MULTI_POLYGON("MultiPolygon")`

    - `properties: 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.

    - `type: Type`

      Always `Feature`

      - `FEATURE("Feature")`

    - `id: Optional<String>`

      Compound identifier in `type/osm_id` format

  - `geometry: Optional<GeoJsonGeometry>`

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

  - `properties: Optional<Properties>`

    Isochrone metadata

    - `areaM2: Optional<Double>`

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

    - `maxCostS: Optional<Double>`

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

    - `mode: Optional<Mode>`

      Travel mode used for the isochrone calculation

      - `AUTO("auto")`

      - `FOOT("foot")`

      - `BICYCLE("bicycle")`

    - `timeSeconds: Optional<Double>`

      Travel time budget in seconds

    - `verticesReached: Optional<Long>`

      Number of road network vertices within the isochrone

  - `type: Optional<Type>`

    `Feature` for single contour, `FeatureCollection` for multiple contours

    - `FEATURE("Feature")`

    - `FEATURE_COLLECTION("FeatureCollection")`

### Example

```kotlin
package com.plazafyi.example

import com.plazafyi.client.PlazaClient
import com.plazafyi.client.okhttp.PlazaOkHttpClient
import com.plazafyi.models.routing.RoutingIsochronePostParams
import com.plazafyi.models.routing.RoutingIsochronePostResponse

fun main() {
    val client: PlazaClient = PlazaOkHttpClient.fromEnv()

    val params: RoutingIsochronePostParams = RoutingIsochronePostParams.builder()
        .lat(0.0)
        .lng(0.0)
        .time(0.0)
        .build()
    val response: RoutingIsochronePostResponse = client.routing().isochronePost(params)
}
```

#### Response

```json
{
  "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"
}
```