## Calculate an isochrone from a point

`routing.isochrone_post(RoutingIsochronePostParams**kwargs)  -> RoutingIsochronePostResponse`

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

Calculate an isochrone from a point

### Parameters

- `lat: float`

  Latitude

- `lng: float`

  Longitude

- `time: float`

  Travel time in seconds (1-7200)

- `format: Optional[str]`

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

- `mode: Optional[str]`

  Travel mode (auto, foot, bicycle)

- `output_fields: Optional[str]`

  Comma-separated property fields to include

- `output_geometry: Optional[bool]`

  Include geometry (default true)

- `output_include: Optional[str]`

  Extra computed fields: bbox, center

- `output_precision: Optional[int]`

  Coordinate decimal precision (1-15, default 7)

- `output_simplify: Optional[float]`

  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: Union[List[float], List[List[float]], List[List[List[float]]], List[List[List[List[float]]]]]`

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

        - `List[float]`

          [longitude, latitude] or [longitude, latitude, elevation]

        - `List[List[float]]`

          Array of [lng, lat] positions

        - `List[List[List[float]]]`

          Array of linear rings / line strings

        - `List[List[List[List[float]]]]`

          Array of polygons

      - `type: Literal["Point", "LineString", "Polygon", 3 more]`

        Geometry type

        - `"Point"`

        - `"LineString"`

        - `"Polygon"`

        - `"MultiPoint"`

        - `"MultiLineString"`

        - `"MultiPolygon"`

    - `properties: Dict[str, object]`

      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: Literal["Feature"]`

      Always `Feature`

      - `"Feature"`

    - `id: Optional[str]`

      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

    - `area_m2: Optional[float]`

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

    - `max_cost_s: Optional[float]`

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

    - `mode: Optional[Literal["auto", "foot", "bicycle"]]`

      Travel mode used for the isochrone calculation

      - `"auto"`

      - `"foot"`

      - `"bicycle"`

    - `time_seconds: Optional[float]`

      Travel time budget in seconds

    - `vertices_reached: Optional[int]`

      Number of road network vertices within the isochrone

  - `type: Optional[Literal["Feature", "FeatureCollection"]]`

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

    - `"Feature"`

    - `"FeatureCollection"`

### Example

```python
import os
from plaza import Plaza

client = Plaza(
    api_key=os.environ.get("PLAZA_API_KEY"),  # This is the default and can be omitted
)
response = client.routing.isochrone_post(
    lat=0,
    lng=0,
    time=0,
)
print(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"
}
```