Use only ne_10m_roads from Natural Earth #81

layers/transportation/class.sql

@@ -41,3 +41,13 @@ CREATE OR REPLACE FUNCTION service_value(service TEXT) RETURNS TEXT AS $$
         ELSE NULL
     END;
 $$ LANGUAGE SQL IMMUTABLE STRICT;
+
+-- Map Natural Earth types to OSM highway
+CREATE OR REPLACE FUNCTION ne_highway(type VARCHAR) RETURNS VARCHAR AS $$
+  SELECT CASE type
+    WHEN 'Major Highway' THEN 'motorway'
+    WHEN 'Secondary Highway' THEN 'trunk'
+    WHEN 'Road' THEN 'primary'
+    ELSE type
+  END;
+$$ LANGUAGE SQL IMMUTABLE;

layers/transportation/layer.sql

@@ -20,16 +20,18 @@ RETURNS TABLE(osm_id bigint, geometry geometry, class text, subclass text, ramp
         brunnel(is_bridge, is_tunnel, is_ford) AS brunnel,
         NULLIF(service, '') AS service
     FROM (
-        -- etldoc: ne_10m_global_roads ->  layer_transportation:z4z6
+        -- etldoc: ne_10m_roads -> layer_transportation:z4z6
         SELECT
-            NULL::bigint AS osm_id, geometry,
+            NULL::bigint AS osm_id, geom AS geometry,
-            highway, NULL AS railway, NULL AS service,
+            ne_highway(type) AS highway, NULL AS railway, NULL AS service,
             NULL::boolean AS is_bridge, NULL::boolean AS is_tunnel,
             NULL::boolean AS is_ford,
             NULL::boolean AS is_ramp, NULL::boolean AS is_oneway,
             0 AS z_order
-        FROM ne_10m_global_roads
+        FROM ne_10m_roads
-        WHERE zoom_level BETWEEN 4 AND 6 AND scalerank <= 1 + zoom_level
+        WHERE featurecla = 'Road'
+            AND type IN ('Major Highway', 'Secondary Highway', 'Road')
+            AND zoom_level BETWEEN 4 AND 6 AND scalerank <= 1 + zoom_level
         UNION ALL
 
         -- etldoc: osm_highway_linestring_gen4  ->  layer_transportation:z7z8

layers/transportation/ne_global_roads.sql

@@ -1,31 +0,0 @@
-
-
-CREATE OR REPLACE FUNCTION ne_highway(type VARCHAR) RETURNS VARCHAR AS $$
-  SELECT CASE type
-    WHEN 'Major Highway' THEN 'motorway'
-    WHEN 'Secondary Highway' THEN 'trunk'
-    WHEN 'Road' THEN 'primary'
-    ELSE type
-  END;
-$$ LANGUAGE SQL IMMUTABLE;
-
-
--- etldoc: ne_global_roads_sql -> ne_10m_global_roads  ;
-CREATE TABLE IF NOT EXISTS ne_10m_global_roads AS (
-
-    -- etldoc:  ne_10m_roads -> ne_10m_global_roads
-    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
-
-    -- etldoc: ne_10m_roads_north_america ->  ne_10m_global_roads
-    SELECT geom AS geometry, scalerank, ne_highway(type) AS highway
-    FROM ne_10m_roads_north_america
-    WHERE class IN ('State', 'Federal', 'Interstate')
-);
-
-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);

layers/transportation/transportation.yaml

@@ -102,7 +102,6 @@ layer:
     query: (SELECT geometry, class, subclass, oneway, ramp, brunnel, service FROM layer_transportation(!bbox!, z(!scale_denominator!))) AS t
 schema:
   - ./class.sql
-  - ./ne_global_roads.sql
   - ./layer.sql
 datasources:
   - type: imposm3