Mapbox Vector Tiles API

Contact Info

HSL, Finland
Arcadis, US

Documentation

This API produces Mapbox vector tiles, which are used by Digitransit-ui and otp-react-redux to show information about public transit entities on the map.

The tiles can be fetched from /otp/routers/{routerId}/vectorTiles/{layers}/{z}/{x}/{y}.pbf, where layers is a comma separated list of layer names from the configuration.

Maplibre/Mapbox GL JS also requires a tilejson.json endpoint which is available at /otp/routers/{routerId}/vectorTiles/{layers}/tilejson.json.

Translatable fields in the tiles are translated based on the accept-language header in requests. Currently, only the language with the highest priority from the header is used.

Configuration

To enable this you need to add the feature otp-config.json.

// otp-config.json
{
  "otpFeatures": {
    "SandboxAPIMapboxVectorTilesApi": true
  }
}

The feature must be configured in router-config.json as follows

{
  "vectorTiles": {
    "basePath": "/only/configure/if/required",
    "layers": [
      {
        "name": "stops",
        "type": "Stop",
        "mapper": "Digitransit",
        "maxZoom": 20,
        "minZoom": 14,
        "cacheMaxSeconds": 600
      },
      // flex zones
      {
        "name": "areaStops",
        "type": "AreaStop",
        "mapper": "OTPRR",
        "maxZoom": 20,
        "minZoom": 14,
        "cacheMaxSeconds": 600
      },
      {
        "name": "stations",
        "type": "Station",
        "mapper": "Digitransit",
        "maxZoom": 20,
        "minZoom": 12,
        "cacheMaxSeconds": 600
      },
      // all rental places: stations and free-floating vehicles
      {
        "name": "citybikes",
        "type": "VehicleRental",
        "mapper": "Digitransit",
        "maxZoom": 20,
        "minZoom": 14,
        "cacheMaxSeconds": 60,
        "expansionFactor": 0.25
      },
      // just free-floating vehicles
      {
        "name": "rentalVehicles",
        "type": "VehicleRentalVehicle",
        "mapper": "DigitransitRealtime",
        "maxZoom": 20,
        "minZoom": 14,
        "cacheMaxSeconds": 60
      },
      // just rental stations
      {
        "name": "rentalStations",
        "type": "VehicleRentalStation",
        "mapper": "Digitransit",
        "maxZoom": 20,
        "minZoom": 14,
        "cacheMaxSeconds": 600
      },
      // Contains just stations and real-time information for them
      {
        "name": "realtimeRentalStations",
        "type": "VehicleRentalStation",
        "mapper": "DigitransitRealtime",
        "maxZoom": 20,
        "minZoom": 14,
        "cacheMaxSeconds": 60
      },
      // Contains just stops and real-time information for them
      {
        "name": "realtimeStops",
        "type": "Stop",
        "mapper": "DigitransitRealtime",
        "maxZoom": 20,
        "minZoom": 14,
        "cacheMaxSeconds": 60
      },
      // This exists for backwards compatibility. At some point, we might want
      // to add a new real-time parking mapper with better translation support
      // and less unnecessary fields.
      {
        "name": "stadtnaviVehicleParking",
        "type": "VehicleParking",
        "mapper": "Stadtnavi",
        "maxZoom": 20,
        "minZoom": 14,
        "cacheMaxSeconds": 60,
        "expansionFactor": 0.25
      },
      // no real-time, translatable fields are translated based on accept-language header
      // and contains less fields than the Stadtnavi mapper
      {
        "name": "vehicleParking",
        "type": "VehicleParking",
        "mapper": "Digitransit",
        "maxZoom": 20,
        "minZoom": 14,
        "cacheMaxSeconds": 600,
        "expansionFactor": 0.25
      },
      {
        "name": "vehicleParkingGroups",
        "type": "VehicleParkingGroup",
        "mapper": "Digitransit",
        "maxZoom": 17,
        "minZoom": 14,
        "cacheMaxSeconds": 600,
        "expansionFactor": 0.25
      }
    ] 
  }
}

For each layer, the configuration includes:

name which is used in the url to fetch tiles, and as the layer name in the vector tiles.
type which tells the type of the layer. Currently supported:
- Stop
- AreaStop: Flex zones
- Station
- VehicleRental: all rental places: stations and free-floating vehicles
- VehicleRentalVehicle: free-floating rental vehicles
- VehicleRentalStation: rental stations
- VehicleParking
- VehicleParkingGroup

Extending

If more generic layers are created for this API, the code should be moved out from the sandbox, into the core, perhaps potentially leaving specific property mappers in place.

Creating a new layer

In order to create a new type of layer, you need to create a new class extending LayerBuilder<T>. You need to implement two methods, List<Geometry> getGeometries(Envelope query), which returns a list of geometries, with an object of type T as their userData in the geometry, and double getExpansionFactor(), which describes how much information outside the tile bounds should be included. This layer then needs to be added into VectorTilesResource.layers, with a new LayerType enum as the key, and the class constructor as the value.

A new mapper needs to be added every time a new layer is added. See below for information.

Creating a new mapper

The mapping contains information of what data to include in the vector tiles. The mappers are defined per layer.

In order to create a new mapper for a layer, you need to create a new class extending PropertyMapper<T>. In that class, you need to implement the method Collection<KeyValue<String, Object>> map(T input). The type T is dependent on the layer for which you implement the mapper for. It needs to return a list of attributes, as key-value pairs which will be written into the vector tile.

The mapper needs to be added to the mappers map in the layer, with a new MapperType enum as the key, and a function to create the mapper, with a Graph object as a parameter, as the value.

Changelog

2020-07-09: Initial version of Mapbox vector tiles API
2021-05-12: Make expansion factor configurable
2021-09-07: Rename BikeRental to VehicleRental
2021-10-13: Correctly serialize the vehicle rental name #3648
2022-01-03: Add support for VehicleParking entities
2022-04-27: Read the headsign for frequency-only patterns correctly #4122
2022-08-23: Remove patterns and add route gtfsTypes to stop layer #4404
2022-10-11: Added layer for VehicleParkingGroups #4510
2022-10-14: Add separate layers for vehicle rental place types #4516
2022-10-19 #4529:
- Translatable fields are now translated based on accept-language header
- Added DigitransitRealtime for vehicle rental stations
- Changed old vehicle parking mapper to be Stadtnavi
- Added a new Digitransit vehicle parking mapper with no real-time information and less fields
2024-01-22: Make basePath configurable #5627
2024-02-27: Add layer for flex zones #5704
2024-03-25: Add layer for realtime stops #5743

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