layer:
  id: "place"
  description: |
      The place layer consists out of [countries](http://wiki.openstreetmap.org/wiki/Tag:place%3Dcountry),
      [states](http://wiki.openstreetmap.org/wiki/Tag:place%3Dstate) and [cities](http://wiki.openstreetmap.org/wiki/Key:place).
      For countries, states and places at low zoom levels (`z0` to `z7`) the
      [Populated Places](http://www.naturalearthdata.com/downloads/10m-cultural-vectors/10m-populated-places/) dataset from NaturalEarth is merged
      with OSM data to only show the most relevant places for the given zoom level. All features derived from NaturalEarth have a `scalerank` field.
      States and countries additionally contain `postal` and `abbreviation` fields for styles that want to fit a lot of data with small labels on the map. 
      The `place` layer only contains more important states (or similar entities) from the US, Russia, China and Brazil.

  buffer_size: 128
  datasource:
    geometry_field: geometry
    query: (SELECT geometry, name, name_en, place, abbrev, postal, scalerank FROM layer_place(!bbox!, z(!scale_denominator!), !pixel_width!)) AS t
schema:
  - ./types.sql
  - ./city.sql
  - ./country.sql
  - ./state.sql
  - ./important_place.sql
  - ./place.sql
datasources:
  - type: imposm3
    mapping_file: ./mapping.yaml