Add aeroway layer

layers/aeroway/aeroway.yaml

@@ -0,0 +1,26 @@
+layer:
+  id: "aeroway"
+  description: |
+      Aeroway polygons based of OpenStreetMap [aeroways](http://wiki.openstreetmap.org/wiki/Aeroways).
+      Airport buildings are contained in the **building** layer but all
+      other airport related polygons can be found in the **aeroway** layer.
+  buffer_size: 4
+  fields:
+    class:
+      description: |
+          The original value of the [`aeroway`](http://wiki.openstreetmap.org/wiki/Key:aeroway) tag.
+      values:
+      - aerodrome
+      - heliport
+      - runway
+      - helipad
+      - taxiway
+      - apron
+  datasource:
+    geometry_field: geometry
+    query: (SELECT geometry, class FROM layer_aeroway(!bbox!, z(!scale_denominator!))) AS t
+schema:
+  - ./layer.sql
+datasources:
+  - type: imposm3
+    mapping_file: ./mapping.yaml

layers/aeroway/layer.sql

@@ -0,0 +1,20 @@
+-- etldoc: layer_aeroway[shape=record fillcolor=lightpink, style="rounded,filled",
+-- etldoc:     label="layer_aeroway |<z12> z12|<z13> z13|<z14> z14" ];
+
+CREATE OR REPLACE FUNCTION layer_aeroway(bbox geometry, zoom_level int)
+RETURNS TABLE(geometry geometry, class text) AS $$
+    SELECT geometry, aeroway AS class FROM (
+        -- etldoc:  aeroway_z12 -> layer_aeroway:z12
+        SELECT geometry, aeroway
+        FROM osm_aeroway_polygon_gen2 WHERE zoom_level = 12
+        UNION ALL
+        -- etldoc:  aeroway_z13 -> layer_aeroway:z13
+        SELECT geometry, aeroway
+        FROM osm_aeroway_polygon_gen1 WHERE zoom_level = 13
+        UNION ALL
+        -- etldoc:  aeroway_z14 -> layer_aeroway:z14_
+        SELECT geometry, aeroway
+        FROM osm_aeroway_polygon WHERE zoom_level >= 14
+    ) AS zoom_levels
+    WHERE geometry && bbox;
+$$ LANGUAGE SQL IMMUTABLE;

layers/aeroway/mapping.yaml

@@ -0,0 +1,34 @@
+generalized_tables:
+  # etldoc: imposm3 -> osm_landcover_polygon_gen2
+  aeroway_polygon_gen2:
+    source: aeroway_polygon_gen1
+    sql_filter: area>240000
+    tolerance: 50.0
+
+  # etldoc: imposm3 -> osm_aeroway_polygon_gen1
+  aeroway_polygon_gen1:
+    source: aeroway_polygon
+    sql_filter: area>60000
+    tolerance: 20.0
+tables:
+  # etldoc: imposm3 -> osm_aeroway_polygon
+  aeroway_polygon:
+    type: polygon
+    fields:
+    - name: osm_id
+      type: id
+    - name: geometry
+      type: geometry
+    - name: aeroway
+      key: aeroway
+      type: string
+    - name: area
+      type: pseudoarea
+    mapping:
+      aeroway:
+      - aerodrome
+      - heliport
+      - runway
+      - helipad
+      - taxiway
+      - apron

openmaptiles.yaml

@@ -13,6 +13,7 @@ tileset:
     - layers/landcover/landcover.yaml
     - layers/park/park.yaml
     - layers/landuse/landuse.yaml
+    - layers/aeroway/aeroway.yaml
   name: OpenMapTiles v1.0
   description: "A tileset showcasing all layers in OpenMapTiles. http://openmaptiles.org"
   attribution: "<a href=\"http://www.openstreetmap.org/about/\" target=\"_blank\">&copy; OpenStreetMap contributors</a>"