## Calculate an isochrone from a point

`client.routing.isochronePost(RoutingIsochronePostParamsparams, RequestOptionsoptions?): RoutingIsochronePostResponse`

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

Calculate an isochrone from a point

### Parameters

- `params: RoutingIsochronePostParams`

  - `lat: number`

    Latitude

  - `lng: number`

    Longitude

  - `time: number`

    Travel time in seconds (1-7200)

  - `format?: string`

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

  - `mode?: string`

    Travel mode (auto, foot, bicycle)

  - `outputFields?: string`

    Comma-separated property fields to include

  - `outputGeometry?: boolean`

    Include geometry (default true)

  - `outputInclude?: string`

    Extra computed fields: bbox, center

  - `outputPrecision?: number`

    Coordinate decimal precision (1-15, default 7)

  - `outputSimplify?: number`

    Simplify geometry tolerance in meters

### Returns

- `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?: Array<GeoJsonFeature> | null`

    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: Array<number> | Array<Array<number>> | Array<Array<Array<number>>> | Array<Array<Array<Array<number>>>>`

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

        - `Array<number>`

        - `Array<Array<number>>`

        - `Array<Array<Array<number>>>`

        - `Array<Array<Array<Array<number>>>>`

      - `type: "Point" | "LineString" | "Polygon" | 3 more`

        Geometry type

        - `"Point"`

        - `"LineString"`

        - `"Polygon"`

        - `"MultiPoint"`

        - `"MultiLineString"`

        - `"MultiPolygon"`

    - `properties: Record<string, unknown>`

      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: "Feature"`

      Always `Feature`

      - `"Feature"`

    - `id?: string`

      Compound identifier in `type/osm_id` format

  - `geometry?: GeoJsonGeometry | null`

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

  - `properties?: Properties | null`

    Isochrone metadata

    - `area_m2?: number | null`

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

    - `max_cost_s?: number | null`

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

    - `mode?: "auto" | "foot" | "bicycle"`

      Travel mode used for the isochrone calculation

      - `"auto"`

      - `"foot"`

      - `"bicycle"`

    - `time_seconds?: number`

      Travel time budget in seconds

    - `vertices_reached?: number`

      Number of road network vertices within the isochrone

  - `type?: "Feature" | "FeatureCollection"`

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

    - `"Feature"`

    - `"FeatureCollection"`

### Example

```typescript
import Plaza from '@plazafyi/sdk';

const client = new Plaza({
  apiKey: process.env['PLAZA_API_KEY'], // This is the default and can be omitted
});

const response = await client.routing.isochronePost({
  lat: 0,
  lng: 0,
  time: 0,
});

console.log(response.features);
```

#### 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"
}
```