## Calculate an isochrone from a point

`client.Routing.Isochrone(ctx, query) (*GeoJsonFeature, error)`

**get** `/api/v1/isochrone`

Calculate an isochrone from a point

### Parameters

- `query RoutingIsochroneParams`

  - `Lat param.Field[float64]`

    Latitude

  - `Lng param.Field[float64]`

    Longitude

  - `Time param.Field[float64]`

    Travel time in seconds (1-7200)

  - `Mode param.Field[string]`

    Travel mode (auto, foot, bicycle)

### Returns

- `type GeoJsonFeature struct{…}`

  - `Geometry GeoJsonGeometry`

    - `Coordinates GeoJsonGeometryCoordinatesUnion`

      GeoJSON coordinates array (nesting depth varies by geometry type)

      - `type GeoJsonGeometryCoordinatesArray []float64`

      - `type GeoJsonGeometryCoordinatesArray [][]float64`

      - `type GeoJsonGeometryCoordinatesArray [][][]float64`

      - `type GeoJsonGeometryCoordinatesArray [][][][]float64`

    - `Type GeoJsonGeometryType`

      - `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]`

  - `Type GeoJsonFeatureType`

    - `const GeoJsonFeatureTypeFeature GeoJsonFeatureType = "Feature"`

  - `ID string`

    Feature identifier (type/osm_id)

  - `OsmID int64`

    OpenStreetMap ID

### 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.Routing.Isochrone(context.TODO(), githubcomplazafyiplazago.RoutingIsochroneParams{
    Lat: githubcomplazafyiplazago.F(0.000000),
    Lng: githubcomplazafyiplazago.F(0.000000),
    Time: githubcomplazafyiplazago.F(0.000000),
  })
  if err != nil {
    panic(err.Error())
  }
  fmt.Printf("%+v\n", geoJsonFeature.ID)
}
```