generalized_tables:
  landcover_polygon_gen0:
    source: landcover_polygon_gen1
    sql_filter: area>500000.000000
    tolerance: 200.0
  landcover_polygon_gen1:
    source: landcover_polygon
    sql_filter: area>50000.000000
    tolerance: 50.0
tables:
  landcover_polygon:
    fields:
    - name: osm_id
      type: id
    - name: geometry
      type: validated_geometry
    - name: landuse
      key: landuse
      type: string
    - name: natural
      key: natural
      type: string
    - name: wetland
      key: wetland
      type: string
    - name: area
      type: pseudoarea
    mapping:
      landuse:
      - allotments
      - farm
      - farmland
      - orchard
      - greenhouse_horticulture
      - plant_nursery
      - vineyard
      - grass
      - grassland
      - meadow
      - park
      - village_green
      - recreation_ground
      - forest
      - beach
      - greenfield
      natural:
      - wetland
      - gravel
      - sand
      - wood
      - scrub
      - mud
      - beach
      - rock
      - bare_rock
      - scree
      - grassland
      - heath
      - fell
      wetland:
      - saltmarsh
      - reedbed
      - bog
      - marsh
      - mangrove
      - swamp
      - tidalflat
    type: polygon