130 lines
3.9 KiB
PL/PgSQL
130 lines
3.9 KiB
PL/PgSQL
CREATE OR REPLACE FUNCTION ne_road_class(type VARCHAR) RETURNS VARCHAR AS $$
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SELECT CASE type
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WHEN 'Major Highway' THEN 'motorway'
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WHEN 'Secondary Highway' THEN 'trunk'
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WHEN 'Road' THEN 'primary'
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ELSE type
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END;
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$$ LANGUAGE SQL IMMUTABLE;
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CREATE TABLE IF NOT EXISTS ne_10m_global_roads AS (
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SELECT geom, scalerank, ne_road_class(type) AS class
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FROM ne_10m_roads
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WHERE continent <> 'North America'
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AND featurecla = 'Road'
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AND type IN ('Major Highway', 'Secondary Highway', 'Road')
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UNION ALL
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SELECT geom, scalerank, ne_road_class(type) AS class
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FROM ne_10m_roads_north_america
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WHERE type IN ('Major Highway', 'Secondary Highway', 'Road')
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);
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CREATE INDEX IF NOT EXISTS ne_10m_global_roads_geom_idx ON ne_10m_global_roads USING gist(geom);
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CREATE INDEX IF NOT EXISTS ne_10m_global_roads_scalerank_idx ON ne_10m_global_roads(scalerank);
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CREATE OR REPLACE VIEW road_z4 AS (
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SELECT geom, class
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FROM ne_10m_global_roads
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WHERE scalerank <= 5
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);
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CREATE OR REPLACE VIEW road_z5 AS (
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SELECT geom, class
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FROM ne_10m_global_roads
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WHERE scalerank <= 6
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);
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CREATE OR REPLACE VIEW road_z6 AS (
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SELECT geom, class
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FROM ne_10m_global_roads
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WHERE scalerank <= 7
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);
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CREATE OR REPLACE VIEW road_z7 AS (
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SELECT geom, class
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FROM ne_10m_global_roads
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WHERE scalerank <= 7
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);
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CREATE TABLE IF NOT EXISTS road_z8 AS (
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SELECT ST_Simplify(way, 200) AS geom, class::text
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FROM roads
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WHERE class IN ('motorway','trunk')
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);
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CREATE INDEX IF NOT EXISTS road_z8_geom_idx ON road_z8 USING gist(geom);
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CREATE TABLE IF NOT EXISTS road_z9 AS (
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SELECT ST_Simplify(way, 120) AS geom, class::text
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FROM roads
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WHERE class IN ('motorway','trunk', 'primary')
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);
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CREATE INDEX IF NOT EXISTS road_z9_geom_idx ON road_z9 USING gist(geom);
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CREATE TABLE IF NOT EXISTS road_z10 AS (
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SELECT ST_Simplify(way, 50) AS geom, class::text
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FROM roads
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WHERE class IN ('motorway','trunk', 'primary', 'secondary')
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);
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CREATE INDEX IF NOT EXISTS road_z10_geom_idx ON road_z10 USING gist(geom);
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CREATE TABLE IF NOT EXISTS road_z11 AS (
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SELECT ST_Simplify(way, 20) AS geom, class::text
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FROM roads
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WHERE class IN ('motorway','trunk', 'primary', 'secondary', 'tertiary')
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);
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CREATE INDEX IF NOT EXISTS road_z11_geom_idx ON road_z11 USING gist(geom);
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CREATE OR REPLACE VIEW road_z12 AS (
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SELECT way AS geom, class::text
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FROM roads
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WHERE class IN ('motorway','trunk','primary', 'secondary', 'tertiary', 'minor')
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UNION ALL
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SELECT way AS geom, class::text
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FROM road_areas
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);
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CREATE OR REPLACE VIEW road_z13 AS (
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SELECT way AS geom, class::text
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FROM roads
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WHERE class NOT IN ('path')
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UNION ALL
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SELECT way AS geom, class::text
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FROM road_areas
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);
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CREATE OR REPLACE VIEW road_z14 AS (
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SELECT way AS geom, class::text
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FROM roads
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UNION ALL
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SELECT way AS geom, class::text
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FROM road_areas
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);
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CREATE OR REPLACE FUNCTION layer_road(bbox geometry, zoom_level int)
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RETURNS TABLE(geom geometry, class text) AS $$
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SELECT geom, class::text FROM (
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SELECT * FROM road_z4 WHERE zoom_level BETWEEN 4 AND 5
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UNION ALL
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SELECT * FROM road_z5 WHERE zoom_level = 5
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UNION ALL
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SELECT * FROM road_z6 WHERE zoom_level = 6
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UNION ALL
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SELECT * FROM road_z7 WHERE zoom_level = 7
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UNION ALL
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SELECT * FROM road_z8 WHERE zoom_level = 8
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UNION ALL
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SELECT geom, class FROM road_z9 WHERE zoom_level = 9
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UNION ALL
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SELECT geom, class FROM road_z10 WHERE zoom_level = 10
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UNION ALL
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SELECT geom, class FROM road_z11 WHERE zoom_level = 11
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UNION ALL
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SELECT geom, class FROM road_z12 WHERE zoom_level = 12
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UNION ALL
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SELECT * FROM road_z13 WHERE zoom_level = 13
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UNION ALL
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SELECT * FROM road_z14 WHERE zoom_level >= 14
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) AS zoom_levels
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WHERE geom && bbox;
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$$ LANGUAGE SQL IMMUTABLE;
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