Add roads from NaturalEarth

data.yml

@@ -89,6 +89,42 @@ 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: road
+    Datasource: 
+      dbname: osm
+      extent: -20037508.34,-20037508.34,20037508.34,20037508.34
+      geometry_field: geom
+      geometry_table: ''
+      host: db
+      key_field: ''
+      key_field_as_attribute: ''
+      max_size: 512
+      password: osm
+      port: 5432
+      srid: ''
+      table: |-
+        ( SELECT *
+          FROM (
+            SELECT * FROM road_z4 WHERE z(!scale_denominator!) = 4
+            UNION ALL
+            SELECT * FROM road_z5 WHERE z(!scale_denominator!) = 5
+            UNION ALL
+            SELECT * FROM road_z6 WHERE z(!scale_denominator!) = 6
+            UNION ALL
+            SELECT * FROM road_z7 WHERE z(!scale_denominator!) >= 7
+          ) AS road
+          WHERE geom && !bbox!
+        ) AS data
+      type: postgis
+      user: osm
+    description: Buildings
+    fields: 
+      featureclass: String
+      scalerank: Number
+      type: String
+    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

schema/create_schema.sh

@@ -19,6 +19,7 @@ function main() {
     exec_psql_file "layers/water.sql"
     exec_psql_file "layers/building.sql"
     exec_psql_file "layers/boundary.sql"
+    exec_psql_file "layers/road.sql"
 }
 
 main

schema/layers/road.sql

@@ -0,0 +1,31 @@
+CREATE OR REPLACE VIEW ne_10m_global_roads AS (
+    SELECT geom, scalerank, featurecla as featureclass, type
+    FROM ne_10m_roads WHERE continent <> 'North America'
+    UNION ALL
+    SELECT geom, scalerank, class as featureclass, type
+    FROM ne_10m_roads_north_america
+);
+
+CREATE OR REPLACE VIEW road_z4 AS (
+    SELECT *
+    FROM ne_10m_global_roads
+    WHERE scalerank <= 4
+);
+
+CREATE OR REPLACE VIEW road_z5 AS (
+    SELECT *
+    FROM ne_10m_global_roads
+    WHERE scalerank <= 5
+);
+
+CREATE OR REPLACE VIEW road_z6 AS (
+    SELECT *
+    FROM ne_10m_global_roads
+    WHERE scalerank <= 6
+);
+
+CREATE OR REPLACE VIEW road_z7 AS (
+    SELECT *
+    FROM ne_10m_global_roads
+    WHERE scalerank <= 7
+);