143 lines
4.9 KiB
PL/PgSQL
143 lines
4.9 KiB
PL/PgSQL
CREATE OR REPLACE VIEW water_z0 AS (
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SELECT geom, 'ocean' AS class FROM ne_110m_ocean
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UNION ALL
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SELECT geom, 'lake' AS class FROM ne_110m_lakes
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);
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CREATE OR REPLACE VIEW water_z1 AS (
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SELECT geom, 'ocean' AS class FROM ne_110m_ocean
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UNION ALL
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SELECT geom, 'lake' AS class FROM ne_110m_lakes
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);
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CREATE OR REPLACE VIEW water_z2 AS (
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SELECT geom, 'ocean' AS class FROM ne_50m_ocean
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UNION ALL
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SELECT geom, 'lake' AS class FROM ne_110m_lakes
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);
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CREATE OR REPLACE VIEW water_z3 AS (
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SELECT geom, 'ocean' AS class FROM ne_50m_ocean
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UNION ALL
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SELECT geom, 'lake' AS class FROM ne_110m_lakes
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UNION ALL
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SELECT geom, 'river' AS class FROM ne_110m_rivers_lake_centerlines
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WHERE featurecla = 'River'
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);
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CREATE OR REPLACE VIEW water_z4 AS (
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SELECT geom, 'ocean' AS class FROM ne_50m_ocean
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UNION ALL
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SELECT geom, 'lake' AS class FROM ne_50m_lakes
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UNION ALL
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SELECT geom, 'river' AS class FROM ne_50m_rivers_lake_centerlines
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WHERE featurecla = 'River'
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);
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CREATE OR REPLACE VIEW water_z5 AS (
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SELECT geom, 'ocean' AS class FROM ne_10m_ocean
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UNION ALL
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SELECT geom, 'lake' AS class FROM ne_10m_lakes
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UNION ALL
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SELECT geom, 'river' AS class FROM ne_50m_rivers_lake_centerlines
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WHERE featurecla = 'River'
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);
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CREATE OR REPLACE VIEW water_z6 AS (
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SELECT geom, 'ocean' AS class FROM ne_10m_ocean
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UNION ALL
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SELECT geom, 'lake' AS class FROM ne_10m_lakes
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UNION ALL
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SELECT geom, 'river' AS class FROM ne_10m_rivers_lake_centerlines
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WHERE featurecla = 'River'
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);
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CREATE TABLE IF NOT EXISTS water_z7 AS (
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SELECT geom, 'ocean' AS class FROM ne_10m_ocean
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UNION ALL
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SELECT geometry AS geom, 'lake' AS class FROM osm_water_polygon_gen3
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UNION ALL
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SELECT geom, 'river' AS class FROM ne_10m_rivers_lake_centerlines
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WHERE featurecla = 'River'
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);
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CREATE INDEX IF NOT EXISTS water_z7_geom_idx ON water_z7 USING gist(geom);
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CREATE TABLE IF NOT EXISTS water_z8 AS (
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SELECT geom, 'ocean' AS class FROM ne_10m_ocean
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UNION ALL
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SELECT geometry AS geom, 'lake' AS class FROM osm_water_polygon_gen2
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UNION ALL
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SELECT ST_Simplify(geometry, 200) AS geom, waterway AS class FROM osm_water_linestring
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WHERE waterway IN ('river') AND ST_Length(geometry) > 10000
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);
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CREATE INDEX IF NOT EXISTS water_z8_geom_idx ON water_z8 USING gist(geom);
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CREATE TABLE IF NOT EXISTS water_z9 AS (
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SELECT geometry AS geom, 'lake' AS class FROM osm_water_polygon_gen1
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UNION ALL
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SELECT ST_Simplify(geometry, 100) AS geom, waterway AS class FROM osm_water_linestring
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WHERE waterway IN ('river') AND ST_Length(geometry) > 5000
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);
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CREATE INDEX IF NOT EXISTS water_z9_geom_idx ON water_z9 USING gist(geom);
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CREATE OR REPLACE VIEW water_z11 AS (
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SELECT geometry AS geom, 'lake' AS class FROM osm_water_polygon WHERE area > 40000
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UNION ALL
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SELECT geometry AS geom, waterway AS class FROM osm_water_linestring
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WHERE waterway IN ('river') AND ST_Length(geometry) > 5000
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);
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CREATE OR REPLACE VIEW water_z12 AS (
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SELECT geometry AS geom, 'lake' AS class FROM osm_water_polygon WHERE area > 10000
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UNION ALL
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SELECT geometry AS geom, waterway AS class FROM osm_water_linestring
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WHERE waterway IN ('river', 'canal') OR (waterway = 'stream' AND ST_Length(geometry) > 1000)
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);
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CREATE OR REPLACE VIEW water_z13 AS (
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SELECT geometry AS geom, 'lake' AS class FROM osm_water_polygon WHERE area > 5000
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UNION ALL
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SELECT geometry AS geom, waterway AS class FROM osm_water_linestring
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WHERE waterway IN ('river', 'canal', 'stream', 'drain', 'ditch') AND ST_Length(geometry) > 300
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);
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CREATE OR REPLACE VIEW water_z14 AS (
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SELECT geometry AS geom, 'lake' AS class FROM osm_water_polygon
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UNION ALL
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SELECT geometry AS geom, waterway AS class FROM osm_water_linestring
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);
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CREATE OR REPLACE FUNCTION layer_water (bbox geometry, zoom_level int)
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RETURNS TABLE(geom geometry, class text) AS $$
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SELECT geom, class FROM (
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SELECT * FROM water_z0 WHERE zoom_level = 0
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UNION ALL
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SELECT * FROM water_z1 WHERE zoom_level = 1
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UNION ALL
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SELECT * FROM water_z2 WHERE zoom_level = 2
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UNION ALL
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SELECT * FROM water_z3 WHERE zoom_level = 3
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UNION ALL
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SELECT * FROM water_z4 WHERE zoom_level = 4
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UNION ALL
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SELECT * FROM water_z5 WHERE zoom_level = 5
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UNION ALL
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SELECT * FROM water_z6 WHERE zoom_level = 6
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UNION ALL
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SELECT * FROM water_z7 WHERE zoom_level = 7
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UNION ALL
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SELECT * FROM water_z8 WHERE zoom_level = 8
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UNION ALL
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SELECT * FROM water_z9 WHERE zoom_level BETWEEN 9 AND 10
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UNION ALL
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SELECT * FROM water_z11 WHERE zoom_level = 11
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UNION ALL
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SELECT * FROM water_z12 WHERE zoom_level = 12
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UNION ALL
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SELECT * FROM water_z13 WHERE zoom_level = 13
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UNION ALL
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SELECT * FROM water_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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