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)). The buildings are not yet ready for 3D rendering support and any help to improve
      this is welcomed.
  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 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 after the method of Paul Norman in [OSM Clear](https://github.com/ClearTables/osm-clear). For future 3D rendering of buildings.
    render_min_height: |
        An approximated height from levels and height of the bottom of the building or building:part after the method of Paul Norman in [OSM Clear](https://github.com/ClearTables/osm-clear). For future 3D rendering of buildings.
    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.
schema:
  - ./update_building.sql
  - ./building.sql
datasources:
  - type: imposm3
    mapping_file: ./mapping.yaml