## Get feature by type and ID

`GeoJsonFeature Elements.Lookup(ElementLookupParams?parameters, CancellationTokencancellationToken = default)`

**post** `/api/v1/features/lookup`

Get feature by type and ID

### Parameters

- `ElementLookupParams parameters`

### Returns

- `class GeoJsonFeature:`

  GeoJSON Feature representing an OSM element. Tags from the original OSM element are flattened directly into `properties` (not nested under a `tags` key). Metadata fields `@type` and `@id` identify the OSM element type and ID within properties.

  - `required GeoJsonGeometry Geometry`

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

    - `required Coordinates Coordinates`

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

      - `IReadOnlyList<Double>`

      - `IReadOnlyList<IReadOnlyList<Double>>`

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

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

    - `required Type Type`

      Geometry type

      - `"Point"Point`

      - `"LineString"LineString`

      - `"Polygon"Polygon`

      - `"MultiPoint"MultiPoint`

      - `"MultiLineString"MultiLineString`

      - `"MultiPolygon"MultiPolygon`

  - `required IReadOnlyDictionary<string, JsonElement> 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.

  - `required Type Type`

    Always `Feature`

    - `"Feature"Feature`

  - `string ID`

    Compound identifier in `type/osm_id` format

### Example

```csharp
ElementLookupParams parameters = new();

var geoJsonFeature = await client.Elements.Lookup(parameters);

Console.WriteLine(geoJsonFeature);
```

#### Response

```json
{
  "geometry": {
    "coordinates": [
      2.3522,
      48.8566
    ],
    "type": "Point"
  },
  "properties": {
    "@id": "bar",
    "@type": "bar",
    "amenity": "bar",
    "cuisine": "bar",
    "name": "bar"
  },
  "type": "Feature",
  "id": "node/21154906"
}
```