Add aeroway_label layer

layers/aerodrome_label/README.md

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+## Aerodrome Labels
+
+### Mapping Diagram
+![Mapping diagram for aerodrome labels](mapping_diagram.png?raw=true)
+
+### ETL diagram
+![ETL diagram for aerodrome labels](etl_diagram.png?raw=true)

layers/aerodrome_label/aerodrome_label.yaml

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+layer:
+  id: "aerodrome_label"
+  description: |
+      [Aerodrome labels](http://wiki.openstreetmap.org/wiki/Tag:aeroway%3Daerodrome)
+  buffer_size: 64
+  srs: +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over
+  fields:
+    name: The OSM [`name`](http://wiki.openstreetmap.org/wiki/Key:name) value of the aerodrome.
+    name_en: English name `name:en` if available, otherwise `name`.
+    name_de: German name `name:de` if available, otherwise `name` or `name:en`.
+    class:
+      description: |
+          Distinguish between more and less important aerodromes.
+          Class is derived from the value of
+          [`aerodrome`](http://wiki.openstreetmap.org/wiki/Proposed_features/Aerodrome)
+          and `aerodrome:type` tags.
+      values:
+      - international
+      - public
+      - regional
+      - military
+      - private
+      - other
+    iata: 3-character code issued by the IATA.
+    icao: 4-letter code issued by the ICAO.
+    ele: Elevation (`ele`) in meters.
+    ele_ft: Elevation (`ele`) in feets.
+  datasource:
+    geometry_field: geometry
+    srid: 900913
+    query: (SELECT osm_id, geometry, name, name_en, name_de, {name_languages}, class, iata, icao, ele, ele_ft FROM layer_aerodrome_label (!bbox!, z(!scale_denominator!), !pixel_width!)) AS t
+schema:
+  - ./update.sql
+  - ./layer.sql
+datasources:
+  - type: imposm3
+    mapping_file: ./mapping.yaml

layers/aerodrome_label/layer.sql

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+
+-- etldoc: layer_aerodrome_label[shape=record fillcolor=lightpink, style="rounded,filled", label="layer_aerodrome_label | <z10_> z10+" ] ;
+
+CREATE OR REPLACE FUNCTION layer_aerodrome_label(
+    bbox geometry,
+    zoom_level integer,
+    pixel_width numeric)
+  RETURNS TABLE(
+    osm_id bigint,
+    geometry geometry,
+    name text,
+    name_en text,
+    name_de text,
+    tags hstore,
+    class text,
+    iata text,
+    icao text,
+    ele int,
+    ele_ft int) AS
+$$
+  -- etldoc: osm_aerodrome_label_point -> layer_aerodrome_label:z10_
+  SELECT
+    osm_id,
+    geometry,
+    name,
+    COALESCE(NULLIF(name_en, ''), name) AS name_en,
+    COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
+    tags,
+    CASE
+      WHEN aerodrome = 'international'
+          OR aerodrome_type = 'international'
+        THEN 'international'
+      WHEN
+          aerodrome = 'public'
+          OR aerodrome_type LIKE '%public%'
+          OR aerodrome_type = 'civil'
+        THEN 'public'
+      WHEN
+          aerodrome = 'regional'
+          OR aerodrome_type = 'regional'
+        THEN 'regional'
+      WHEN
+          aerodrome = 'military'
+          OR aerodrome_type LIKE '%military%'
+          OR military = 'airfield'
+        THEN 'military'
+      WHEN
+          aerodrome = 'private'
+          OR aerodrome_type = 'private'
+        THEN 'private'
+      ELSE 'other'
+    END AS class,
+    NULLIF(iata, '') AS iata,
+    NULLIF(icao, '') AS icao,
+    substring(ele from E'^(-?\\d+)(\\D|$)')::int AS ele,
+    round(substring(ele from E'^(-?\\d+)(\\D|$)')::int*3.2808399)::int AS ele_ft
+  FROM osm_aerodrome_label_point
+  WHERE geometry && bbox AND zoom_level >= 10;
+
+$$ LANGUAGE SQL IMMUTABLE;

layers/aerodrome_label/mapping.yaml

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+tables:
+
+  # etldoc: imposm3 -> osm_aerodrome_label_point
+  aerodrome_label_point:
+    type: geometry
+    fields:
+    - name: osm_id
+      type: id
+    - name: geometry
+      type: geometry
+    - name: name
+      key: name
+      type: string
+    - name: name_en
+      key: name:en
+      type: string
+    - name: name_de
+      key: name:de
+      type: string
+    - name: tags
+      type: hstore_tags
+    - name: aerodrome_type
+      key: aerodrome:type
+      type: string
+    - name: aerodrome
+      key: aerodrome
+      type: string
+    - name: military
+      key: military
+      type: string
+    - name: iata
+      key: iata
+      type: string
+    - name: icao
+      key: icao
+      type: string
+    - name: ele
+      key: ele
+      type: string
+    type_mappings:
+      points:
+        aeroway:
+        - aerodrome
+      polygons:
+        aeroway:
+        - aerodrome

layers/aerodrome_label/update.sql

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+DROP TRIGGER IF EXISTS trigger_flag ON osm_aerodrome_label_point;
+DROP TRIGGER IF EXISTS trigger_refresh ON aerodrome_label.updates;
+
+-- etldoc: osm_aerodrome_label_point -> osm_aerodrome_label_point
+CREATE OR REPLACE FUNCTION update_aerodrome_label_point() RETURNS VOID AS $$
+BEGIN
+  UPDATE osm_aerodrome_label_point
+  SET geometry = ST_Centroid(geometry)
+  WHERE ST_GeometryType(geometry) <> 'ST_Point';
+
+  UPDATE osm_aerodrome_label_point
+  SET tags = slice_language_tags(tags) || get_basic_names(tags, geometry)
+  WHERE COALESCE(tags->'name:latin', tags->'name:nonlatin', tags->'name_int') IS NULL;
+END;
+$$ LANGUAGE plpgsql;
+
+SELECT update_aerodrome_label_point();
+
+-- Handle updates
+
+CREATE SCHEMA IF NOT EXISTS aerodrome_label;
+
+CREATE TABLE IF NOT EXISTS aerodrome_label.updates(id serial primary key, t text, unique (t));
+CREATE OR REPLACE FUNCTION aerodrome_label.flag() RETURNS trigger AS $$
+BEGIN
+    INSERT INTO aerodrome_label.updates(t) VALUES ('y')  ON CONFLICT(t) DO NOTHING;
+    RETURN null;
+END;
+$$ language plpgsql;
+
+CREATE OR REPLACE FUNCTION aerodrome_label.refresh() RETURNS trigger AS
+  $BODY$
+  BEGIN
+    RAISE LOG 'Refresh aerodrome_label';
+    PERFORM update_aerodrome_label_point();
+    DELETE FROM aerodrome_label.updates;
+    RETURN null;
+  END;
+  $BODY$
+language plpgsql;
+
+CREATE TRIGGER trigger_flag
+    AFTER INSERT OR UPDATE OR DELETE ON osm_aerodrome_label_point
+    FOR EACH STATEMENT
+    EXECUTE PROCEDURE aerodrome_label.flag();
+
+CREATE CONSTRAINT TRIGGER trigger_refresh
+    AFTER INSERT ON aerodrome_label.updates
+    INITIALLY DEFERRED
+    FOR EACH ROW
+    EXECUTE PROCEDURE aerodrome_label.refresh();

openmaptiles.yaml

@@ -15,6 +15,7 @@ tileset:
     - layers/place/place.yaml
     - layers/housenumber/housenumber.yaml
     - layers/poi/poi.yaml
+    - layers/aerodrome_label/aerodrome_label.yaml
   name: OpenMapTiles
   version: 3.3.0
   id: openmaptiles