Add building layer

README.md

@@ -78,9 +78,10 @@ docker-compose run import-osm
 
 ### Work on Vector Tile Schema
 
-Run the `db-schema` container each time you modify SQL code inside `./schema`.
+Build and run the `db-schema` container each time you modify SQL code inside `./schema`.
 
 ```bash
+docker-compose build db-schema
 docker-compose run db-schema
 ```
 

data.yml

@@ -51,6 +51,43 @@ Layer:
     properties: 
       "buffer-size": 4
     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
+  - id: building
+    Datasource: 
+      dbname: osm
+      extent: -20037508.34,-20037508.34,20037508.34,20037508.34
+      geometry_field: way
+      geometry_table: ''
+      host: db
+      key_field: ''
+      key_field_as_attribute: ''
+      max_size: 512
+      password: osm
+      port: 5432
+      srid: ''
+      table: |-
+        ( SELECT
+            osm_id,
+            way,
+            least(greatest(3, COALESCE(height, levels*3.66,5)),400)^.7 AS render_height
+          FROM (
+              SELECT osm_id, ST_Simplify(way, 10) AS way, height, levels FROM building_z13
+              WHERE z(!scale_denominator!) = 13
+              UNION ALL
+              SELECT * FROM building_z14
+              WHERE z(!scale_denominator!) >= 14
+          ) AS water
+          WHERE way && !bbox!
+          ORDER BY render_height, ST_YMin(way) DESC
+        ) AS data
+      type: postgis
+      user: osm
+    description: Buildings
+    fields: 
+      osm_id: Number
+      render_height: Number
+    properties: 
+      "buffer-size": 4
+    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
 maxzoom: 14
 minzoom: 0
 name: OSM2VectorTiles v3.0

schema/create_schema.sh

@@ -17,6 +17,7 @@ function exec_psql_file() {
 function main() {
     exec_psql_file "$VT_UTIL_DIR/postgis-vt-util.sql"
     exec_psql_file "layers/water.sql"
+    exec_psql_file "layers/building.sql"
 }
 
 main

schema/layers/building.sql

@@ -0,0 +1,7 @@
+CREATE OR REPLACE VIEW building_z13 AS (
+    SELECT osm_id, way, height, levels FROM buildings WHERE way_area > 1400
+);
+
+CREATE OR REPLACE VIEW building_z14 AS (
+    SELECT osm_id, way, height, levels FROM buildings
+);