Adjust zoom levels of transportation layer, stop using ne_10m_roads source

layers/transportation/class.sql

@@ -42,13 +42,3 @@ 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

@@ -20,18 +20,26 @@ RETURNS TABLE(osm_id bigint, geometry geometry, class text, ramp int, oneway int
         brunnel(is_bridge, is_tunnel, is_ford) AS brunnel,
         NULLIF(service, '') AS service
     FROM (
-        -- etldoc: ne_10m_roads -> layer_transportation:z4z6
+        -- etldoc: osm_highway_linestring_gen6 -> layer_transportation:z4
         SELECT
-            NULL::bigint AS osm_id, geometry,
-            ne_highway(type) AS highway, NULL AS railway, NULL AS service,
+            osm_id, geometry, 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_roads
-        WHERE featurecla = 'Road'
-            AND type IN ('Major Highway', 'Secondary Highway', 'Road')
-            AND zoom_level BETWEEN 4 AND 6 AND scalerank <= 1 + zoom_level
+            z_order
+        FROM osm_highway_linestring_gen6
+        WHERE zoom_level = 4
+        UNION ALL
+
+        -- etldoc: osm_highway_linestring_gen5 -> layer_transportation:z5z6
+        SELECT
+            osm_id, geometry, 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,
+            z_order
+        FROM osm_highway_linestring_gen5
+        WHERE zoom_level BETWEEN 5 AND 6
         UNION ALL
 
         -- etldoc: osm_highway_linestring_gen4  ->  layer_transportation:z7z8
@@ -42,7 +50,7 @@ RETURNS TABLE(osm_id bigint, geometry geometry, class text, ramp int, oneway int
             NULL::boolean AS is_ramp, NULL::boolean AS is_oneway,
             z_order
         FROM osm_highway_linestring_gen4
-        WHERE zoom_level BETWEEN 7 AND 8
+        WHERE zoom_level = 7
         UNION ALL
 
         -- etldoc: osm_highway_linestring_gen3  ->  layer_transportation:z9
@@ -53,7 +61,7 @@ RETURNS TABLE(osm_id bigint, geometry geometry, class text, ramp int, oneway int
             NULL::boolean AS is_ramp, NULL::boolean AS is_oneway,
             z_order
         FROM osm_highway_linestring_gen3
-        WHERE zoom_level = 9
+        WHERE zoom_level = 8
         UNION ALL
 
         -- etldoc: osm_highway_linestring_gen2  ->  layer_transportation:z10
@@ -64,7 +72,7 @@ RETURNS TABLE(osm_id bigint, geometry geometry, class text, ramp int, oneway int
             NULL::boolean AS is_ramp, NULL::boolean AS is_oneway,
             z_order
         FROM osm_highway_linestring_gen2
-        WHERE zoom_level = 10
+        WHERE zoom_level BETWEEN 9 AND 10
         UNION ALL
 
         -- etldoc: osm_highway_linestring_gen1  ->  layer_transportation:z11

layers/transportation/mapping.yaml

@@ -11,6 +11,18 @@ generalized_tables:
     sql_filter: railway='rail' AND service=''
     tolerance: 20.0
 
+# etldoc: imposm3 -> osm_highway_linestring_gen6
+  highway_linestring_gen6:
+    source: highway_linestring_gen5
+    sql_filter: highway IN ('motorway') AND NOT is_area
+    tolerance: 2000.0
+
+# etldoc: imposm3 -> osm_highway_linestring_gen5
+  highway_linestring_gen5:
+    source: highway_linestring_gen4
+    sql_filter: highway IN ('motorway','trunk') AND NOT is_area
+    tolerance: 500.0
+
 # etldoc: imposm3 -> osm_highway_linestring_gen4
   highway_linestring_gen4:
     source: highway_linestring_gen3