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:
    query: (SELECT geometry, render_height, render_min_height 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.
schema:
  - ./building.sql
datasources:
  - type: imposm3
    mapping_file: ./mapping.yaml