## Calculate an isochrone from a point

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

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

Calculate an isochrone from a point

### Parameters

- `RoutingIsochronePostParams params`

  - `double lat`

    Latitude

  - `double lng`

    Longitude

  - `double time`

    Travel time in seconds (1-7200)

  - `Optional<String> format`

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

  - `Optional<String> mode`

    Travel mode (auto, foot, bicycle)

  - `Optional<String> outputFields`

    Comma-separated property fields to include

  - `Optional<Boolean> outputGeometry`

    Include geometry (default true)

  - `Optional<String> outputInclude`

    Extra computed fields: bbox, center

  - `Optional<Long> outputPrecision`

    Coordinate decimal precision (1-15, default 7)

  - `Optional<Double> outputSimplify`

    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.

  - `Optional<List<GeoJsonFeature>> features`

    Array of isochrone polygon Features (multi-contour only)

    - `GeoJsonGeometry geometry`

      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")`

    - `Optional<String> id`

      Compound identifier in `type/osm_id` format

  - `Optional<GeoJsonGeometry> geometry`

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

  - `Optional<Properties> properties`

    Isochrone metadata

    - `Optional<Double> areaM2`

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

    - `Optional<Double> maxCostS`

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

    - `Optional<Mode> mode`

      Travel mode used for the isochrone calculation

      - `AUTO("auto")`

      - `FOOT("foot")`

      - `BICYCLE("bicycle")`

    - `Optional<Double> timeSeconds`

      Travel time budget in seconds

    - `Optional<Long> verticesReached`

      Number of road network vertices within the isochrone

  - `Optional<Type> type`

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

    - `FEATURE("Feature")`

    - `FEATURE_COLLECTION("FeatureCollection")`

### Example

```java
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;

public final class Main {
    private Main() {}

    public static void main(String[] args) {
        PlazaClient client = PlazaOkHttpClient.fromEnv();

        RoutingIsochronePostParams params = RoutingIsochronePostParams.builder()
            .lat(0.0)
            .lng(0.0)
            .time(0.0)
            .build();
        RoutingIsochronePostResponse response = 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"
}
```