layer:
  id: "poi"
  description: |
      [Points of interests](http://wiki.openstreetmap.org/wiki/Points_of_interest) containing
      a of a variety of OpenStreetMap tags. Mostly contains amenities, sport, shop and tourist POIs.
  buffer_size: 64
  srs: +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over
  fields:
    name: The OSM [`name`](http://wiki.openstreetmap.org/wiki/Key:name) value of the POI.
    name_en: English name `name:en` if available, otherwise `name`.
    name_de: German name `name:de` if available, otherwise `name` or `name:en`.
    class: |
        More general classes of POIs. If there is no more general `class` for the `subclass`
        this field will contain the same value as `subclass`.
        But for example for schools you only need to style the class `school` to filter the subclasses `school`
        and `kindergarten`. Or use the class `shop` to style all shops.
    subclass:
      description: |
          Original value of either the
          [`amenity`](http://wiki.openstreetmap.org/wiki/Key:amenity),
          [`leisure`](http://wiki.openstreetmap.org/wiki/Key:leisure),
          [`landuse`](http://wiki.openstreetmap.org/wiki/Key:landuse),
          [`railway`](http://wiki.openstreetmap.org/wiki/Key:railway),
          [`station`](http://wiki.openstreetmap.org/wiki/Key:station),
          [`sport`](http://wiki.openstreetmap.org/wiki/Key:sport),
          [`tourism`](http://wiki.openstreetmap.org/wiki/Key:tourism),
          [`information`](http://wiki.openstreetmap.org/wiki/Key:information),
          [`religion`](http://wiki.openstreetmap.org/wiki/Key:religion)
          or [`shop`](http://wiki.openstreetmap.org/wiki/Key:shop)
          tag.  Use this to do more precise styling.
    rank: |
        The POIs are ranked ascending according to their importance within a grid. The `rank` value shows the
        local relative importance of a POI within it's cell in the grid. This can be used to reduce label density at *z14*.
        Since all POIs already need to be contained at *z14* you can use `less than rank=10` epxression to limit
        POIs. At some point like *z17* you can show all POIs.
    agg_stop:
      description: |
          Experimental feature! Indicates main platform of public transport
          stops (buses, trams, and subways). Grouping of platforms is
          implemented using
          [`uic_ref`](http://wiki.openstreetmap.org/wiki/Key:uic_ref) tag that
           is not used worldwide.
      values: [1]
  datasource:
    geometry_field: geometry
    key_field: osm_id
    key_field_as_attribute: no
    srid: 900913
    query: (SELECT osm_id, geometry, name, name_en, name_de, {name_languages}, class, subclass, agg_stop, rank FROM layer_poi(!bbox!, z(!scale_denominator!), !pixel_width!)) AS t
schema:
  - ./public_transport_stop_type.sql
  - ./update_poi_polygon.sql
  - ./update_poi_point.sql
  - ./class.sql
  - ./poi_stop_agg.sql
  - ./layer.sql
datasources:
  - type: imposm3
    mapping_file: ./mapping.yaml