## Get feature by type and ID

`client.Elements.Lookup(ctx) (*GeoJsonFeature, error)`

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

Get feature by type and ID

### Returns

- `type GeoJsonFeature struct{…}`

  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.

  - `Geometry GeoJsonGeometry`

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

    - `Coordinates GeoJsonGeometryCoordinatesUnion`

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

      - `type GeoJsonGeometryCoordinatesPoint []float64`

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

      - `type GeoJsonGeometryCoordinatesLineStringOrMultiPoint [][]float64`

        Array of [lng, lat] positions

      - `type GeoJsonGeometryCoordinatesPolygonOrMultiLineString [][][]float64`

        Array of linear rings / line strings

      - `type GeoJsonGeometryCoordinatesMultiPolygon [][][][]float64`

        Array of polygons

    - `Type GeoJsonGeometryType`

      Geometry type

      - `const GeoJsonGeometryTypePoint GeoJsonGeometryType = "Point"`

      - `const GeoJsonGeometryTypeLineString GeoJsonGeometryType = "LineString"`

      - `const GeoJsonGeometryTypePolygon GeoJsonGeometryType = "Polygon"`

      - `const GeoJsonGeometryTypeMultiPoint GeoJsonGeometryType = "MultiPoint"`

      - `const GeoJsonGeometryTypeMultiLineString GeoJsonGeometryType = "MultiLineString"`

      - `const GeoJsonGeometryTypeMultiPolygon GeoJsonGeometryType = "MultiPolygon"`

  - `Properties map[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 GeoJsonFeatureType`

    Always `Feature`

    - `const GeoJsonFeatureTypeFeature GeoJsonFeatureType = "Feature"`

  - `ID string`

    Compound identifier in `type/osm_id` format

### Example

```go
package main

import (
  "context"
  "fmt"

  "github.com/plazafyi/plaza-go"
  "github.com/plazafyi/plaza-go/option"
)

func main() {
  client := githubcomplazafyiplazago.NewClient(
    option.WithAPIKey("My API Key"),
  )
  geoJsonFeature, err := client.Elements.Lookup(context.TODO())
  if err != nil {
    panic(err.Error())
  }
  fmt.Printf("%+v\n", geoJsonFeature.ID)
}
```

#### 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"
}
```