Road classifciation a la ClearTables

layers/highway/highway.sql

@@ -1,3 +1,16 @@
+CREATE OR REPLACE FUNCTION highway_class(highway TEXT) RETURNS TEXT AS $$
+    SELECT CASE
+        WHEN highway IN ('unclassified', 'residential', 'living_street', 'road', 'track', 'service') THEN 'minor'
+        WHEN highway IN ('primary', 'primary_link') THEN 'primary'
+        WHEN highway IN ('secondary', 'secondary_link') THEN 'secondary'
+        WHEN highway IN ('tertiary', 'tertiary_link') THEN 'tertiary'
+        WHEN highway IN ('motorway', 'motorway_link') THEN 'motorway'
+        WHEN highway IN ('trunk', 'trunk_link') THEN 'trunk'
+        WHEN highway IN ('pedestrian', 'path', 'footway', 'cycleway', 'steps') THEN 'path'
+        ELSE NULL
+    END;
+$$ LANGUAGE SQL IMMUTABLE;
+
 CREATE OR REPLACE FUNCTION ne_highway(type VARCHAR) RETURNS VARCHAR AS $$
   SELECT CASE type
     WHEN 'Major Highway' THEN 'motorway'
@@ -8,80 +21,80 @@ CREATE OR REPLACE FUNCTION ne_highway(type VARCHAR) RETURNS VARCHAR AS $$
 $$ LANGUAGE SQL IMMUTABLE;
 
 CREATE TABLE IF NOT EXISTS ne_10m_global_roads AS (
-    SELECT geom, scalerank, ne_highway(type) AS highway
+    SELECT geom AS geometry, scalerank, ne_highway(type) AS highway
     FROM ne_10m_roads
     WHERE continent <> 'North America'
       AND featurecla = 'Road'
       AND type IN ('Major Highway', 'Secondary Highway', 'Road')
     UNION ALL
-    SELECT geom, scalerank, ne_highway(type) AS highway
+    SELECT geom AS geometry, scalerank, ne_highway(type) AS highway
     FROM ne_10m_roads_north_america
     WHERE type IN ('Major Highway', 'Secondary Highway', 'Road')
 );
 
-CREATE INDEX IF NOT EXISTS ne_10m_global_roads_geom_idx ON ne_10m_global_roads USING gist(geom);
+CREATE INDEX IF NOT EXISTS ne_10m_global_roads_geometry_idx ON ne_10m_global_roads USING gist(geometry);
 CREATE INDEX IF NOT EXISTS ne_10m_global_roads_scalerank_idx ON ne_10m_global_roads(scalerank);
 
 CREATE OR REPLACE VIEW highway_z4 AS (
-    SELECT geom, highway
+    SELECT geometry, highway
     FROM ne_10m_global_roads
     WHERE scalerank <= 5
 );
 
 CREATE OR REPLACE VIEW highway_z5 AS (
-    SELECT geom, highway
+    SELECT geometry, highway
     FROM ne_10m_global_roads
     WHERE scalerank <= 6
 );
 
 CREATE OR REPLACE VIEW highway_z6 AS (
-    SELECT geom, highway
+    SELECT geometry, highway
     FROM ne_10m_global_roads
     WHERE scalerank <= 7
 );
 
 CREATE OR REPLACE VIEW highway_z7 AS (
-    SELECT geom, highway
+    SELECT geometry, highway
     FROM ne_10m_global_roads
     WHERE scalerank <= 7
 );
 
 CREATE TABLE IF NOT EXISTS highway_z8 AS (
-    SELECT ST_Simplify(geometry, 200) AS geom, highway
+    SELECT ST_Simplify(geometry, 200) AS geometry, highway
     FROM osm_highway_linestring
     WHERE highway IN ('motorway','trunk')
 );
-CREATE INDEX IF NOT EXISTS highway_z8_geom_idx ON highway_z8 USING gist(geom);
+CREATE INDEX IF NOT EXISTS highway_z8_geometry_idx ON highway_z8 USING gist(geometry);
 
 CREATE TABLE IF NOT EXISTS highway_z9 AS (
-    SELECT ST_Simplify(geometry, 120) AS geom, highway
+    SELECT ST_Simplify(geometry, 120) AS geometry, highway
     FROM osm_highway_linestring
     WHERE highway IN ('motorway','trunk', 'primary')
 );
-CREATE INDEX IF NOT EXISTS highway_z9_geom_idx ON highway_z9 USING gist(geom);
+CREATE INDEX IF NOT EXISTS highway_z9_geometry_idx ON highway_z9 USING gist(geometry);
 
 CREATE TABLE IF NOT EXISTS highway_z10 AS (
-    SELECT ST_Simplify(geometry, 50) AS geom, highway
+    SELECT ST_Simplify(geometry, 50) AS geometry, highway
     FROM osm_highway_linestring
     WHERE highway IN ('motorway','trunk', 'primary', 'secondary')
 );
-CREATE INDEX IF NOT EXISTS highway_z10_geom_idx ON highway_z10 USING gist(geom);
+CREATE INDEX IF NOT EXISTS highway_z10_geometry_idx ON highway_z10 USING gist(geometry);
 
 CREATE TABLE IF NOT EXISTS highway_z11 AS (
-    SELECT ST_Simplify(geometry, 20) AS geom, highway
+    SELECT ST_Simplify(geometry, 20) AS geometry, highway
     FROM osm_highway_linestring
     WHERE highway IN ('motorway','trunk', 'primary', 'secondary', 'tertiary')
 );
-CREATE INDEX IF NOT EXISTS highway_z11_geom_idx ON highway_z11 USING gist(geom);
+CREATE INDEX IF NOT EXISTS highway_z11_geometry_idx ON highway_z11 USING gist(geometry);
 
 CREATE OR REPLACE VIEW highway_z12 AS (
-    SELECT geometry AS geom, highway
+    SELECT geometry, highway
     FROM osm_highway_linestring
     WHERE highway IN ('motorway','trunk','primary', 'secondary', 'tertiary', 'minor')
 );
 
 CREATE OR REPLACE VIEW highway_z13 AS (
-    SELECT geometry AS geom, highway
+    SELECT geometry, highway
     FROM osm_highway_linestring
     WHERE highway IN (
         'motorway',
@@ -101,15 +114,14 @@ CREATE OR REPLACE VIEW highway_z13 AS (
     )
 );
 
-
 CREATE OR REPLACE VIEW highway_z14 AS (
     SELECT geometry AS geom, highway
     FROM osm_highway_linestring
 );
 
 CREATE OR REPLACE FUNCTION layer_highway(bbox geometry, zoom_level int)
-RETURNS TABLE(geom geometry, highway text) AS $$
-    SELECT geom, highway FROM (
+RETURNS TABLE(geometry geometry, class text, subclass text) AS $$
+    SELECT geometry, highway_class(highway) AS class, highway AS sublcass FROM (
         SELECT * FROM highway_z4 WHERE zoom_level BETWEEN 4 AND 5
         UNION ALL
         SELECT * FROM highway_z5 WHERE zoom_level = 5
@@ -132,5 +144,5 @@ RETURNS TABLE(geom geometry, highway text) AS $$
         UNION ALL
         SELECT * FROM highway_z14 WHERE zoom_level >= 14
     ) AS zoom_levels
-    WHERE geom && bbox;
+    WHERE geometry && bbox;
 $$ LANGUAGE SQL IMMUTABLE;

layers/highway/highway.yaml

@@ -8,6 +8,7 @@ layer:
   fields:
     class: String
   datasource:
+    geometry_field: geometry
     srid: 900913
     query: (SELECT * FROM layer_highway(!bbox!, z(!scale_denominator!))) AS t
 schema: