layer:
  id: "building"
  description: |
    All [OSM Buildings](http://wiki.openstreetmap.org/wiki/Buildings). All building tags are imported ([`building=*`](http://wiki.openstreetmap.org/wiki/Key:building)).
    Only buildings with tag location:underground are excluded.
  buffer_size: 4
  datasource:
    geometry_field: geometry
    key_field: osm_id
    key_field_as_attribute: no
    srid: 900913
    query: (SELECT osm_id, geometry, render_height, render_min_height, colour, hide_3d, building FROM layer_building(!bbox!, z(!scale_denominator!))) AS t
  fields:
    render_height: |
      An approximated height from levels and height of the building or building:part.
    render_min_height: |
      An approximated height from minimum levels or minimum height of the bottom of the building or building:part.
    colour: |
      Colour
    hide_3d: |
      If True, building (part) should not be rendered in 3D. Currently, [building outlines](https://wiki.openstreetmap.org/wiki/Simple_3D_buildings) are marked as hide_3d.
    building:
schema:
  - ./update_building.sql
  - ./building.sql
datasources:
  - type: imposm3
    mapping_file: ./mapping.yaml