Add mountain_peak layer

layers/mountain_peak/layer.sql

@@ -0,0 +1,23 @@
+CREATE OR REPLACE FUNCTION layer_mountain_peak(bbox geometry, zoom_level integer, pixel_width numeric)
+RETURNS TABLE(osm_id bigint, geometry geometry, name text, name_en text, ele int, ele_ft int, "rank" int) AS $$
+   -- etldoc: osm_housenumber_point -> layer_housenumber:z14_
+   SELECT osm_id, geometry, name, name_en, ele, ele_ft, rank
+   FROM (
+     SELECT osm_id, geometry, name, name_en,
+     substring(ele from E'^(-?\\d+)(\\D|$)')::int AS ele,
+     round(substring(ele from E'^(-?\\d+)(\\D|$)')::int*3.2808399) AS ele_ft,
+       row_number() OVER (
+           PARTITION BY LabelGrid(geometry, 100 * pixel_width)
+           ORDER BY (
+             substring(ele from E'^(-?\\d+)(\\D|$)')::int +
+             (CASE WHEN length(NULLIF(wikipedia, '')) > 0 THEN 10000 ELSE 0 END) +
+             (CASE WHEN length(NULLIF(name, '')) > 0 THEN 10000 ELSE 0 END)
+           ) DESC
+       )::int AS "rank"
+     FROM osm_peak_point
+     WHERE geometry && bbox AND ele is not null AND ele ~ E'^-?\\d+'
+   ) AS ranked_peaks
+   WHERE zoom_level >= 7 AND (rank <= 5 OR zoom_level >= 14)
+   ORDER BY "rank" ASC;
+
+$$ LANGUAGE SQL IMMUTABLE;

layers/mountain_peak/mapping.yaml

@@ -0,0 +1,26 @@
+
+tables:
+
+  # etldoc: imposm3 -> osm_housenumber_point
+  peak_point:
+    type: point
+    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: ele
+      key: ele
+      type: string
+    - name: wikipedia
+      key: wikipedia
+      type: string
+    mapping:
+      natural:
+      - peak

layers/mountain_peak/mountain_peak.yaml

@@ -0,0 +1,20 @@
+layer:
+  id: "mountain_peak"
+  description: |
+      [Peaks](http://wiki.openstreetmap.org/wiki/Tag:natural%3Dpeak)
+      or [volcanoes](http://wiki.openstreetmap.org/wiki/Tag:natural%3Dvolcano)
+  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 peak.
+    name_en: The english `name:en` value if available.
+    elev_m: Elevation (`ele`) in meters.
+  datasource:
+    geometry_field: geometry
+    srid: 900913
+    query: (SELECT osm_id, geometry, name, name_en, ele, ele_ft, rank FROM layer_mountain_peak(!bbox!, z(!scale_denominator!), !pixel_width!)) AS t
+schema:
+  - ./layer.sql
+datasources:
+  - type: imposm3
+    mapping_file: ./mapping.yaml

openmaptiles.yaml

@@ -4,6 +4,7 @@ tileset:
     - layers/waterway/waterway.yaml
     - layers/landcover/landcover.yaml
     - layers/landuse/landuse.yaml
+    - layers/mountain_peak/mountain_peak.yaml
     - layers/park/park.yaml
     - layers/boundary/boundary.yaml
     - layers/aeroway/aeroway.yaml