146 lines
3.7 KiB
PL/PgSQL
146 lines
3.7 KiB
PL/PgSQL
CREATE OR REPLACE VIEW water_z0 AS (
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SELECT geom FROM ne_110m_ocean
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UNION ALL
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SELECT geom 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 FROM ne_110m_ocean
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UNION ALL
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SELECT geom 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 FROM ne_50m_ocean
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UNION ALL
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SELECT geom 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 FROM ne_50m_ocean
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UNION ALL
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SELECT geom FROM ne_110m_lakes
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UNION ALL
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SELECT geom 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 FROM ne_50m_ocean
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UNION ALL
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SELECT geom FROM ne_50m_lakes
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UNION ALL
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SELECT geom 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 FROM ne_10m_ocean
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UNION ALL
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SELECT geom FROM ne_10m_lakes
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UNION ALL
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SELECT geom 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 FROM ne_10m_ocean
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UNION ALL
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SELECT geom FROM ne_10m_lakes
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UNION ALL
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SELECT geom FROM ne_10m_rivers_lake_centerlines
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WHERE featurecla = 'River'
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);
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CREATE OR REPLACE VIEW water_z8 AS (
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SELECT way AS geom FROM water_areas
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WHERE way_area > 1000000
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UNION ALL
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SELECT way AS geom FROM waterways
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WHERE waterway IN ('river') AND ST_Length(way) > 10000
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);
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CREATE OR REPLACE VIEW water_z9 AS (
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SELECT way AS geom FROM water_areas
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WHERE way_area > 500000
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UNION ALL
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SELECT way AS geom FROM waterways
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WHERE waterway IN ('river') AND ST_Length(way) > 5000
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);
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CREATE OR REPLACE VIEW water_z11 AS (
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SELECT way AS geom FROM water_areas
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WHERE way_area > 50000
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UNION ALL
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SELECT way AS geom FROM waterways
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WHERE waterway IN ('river')
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);
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CREATE OR REPLACE VIEW water_z12 AS (
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SELECT way AS geom FROM water_areas
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WHERE way_area > 40000
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UNION ALL
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SELECT way AS geom FROM waterways
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WHERE waterway IN ('river', 'canal', 'stream')
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);
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CREATE OR REPLACE VIEW water_z13 AS (
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SELECT way AS geom FROM water_areas
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WHERE way_area > 2000
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UNION ALL
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SELECT way AS geom FROM waterways
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WHERE waterway IN ('river', 'canal', 'stream', 'drain', 'ditch')
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);
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CREATE OR REPLACE VIEW water_z14 AS (
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SELECT way AS geom FROM water_areas
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UNION ALL
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SELECT way AS geom FROM waterways
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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) AS $$
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WITH zoom_levels AS (
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SELECT * FROM water_z0
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WHERE zoom_level = 0
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UNION ALL
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SELECT * FROM water_z1
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WHERE zoom_level = 1
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UNION ALL
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SELECT * FROM water_z2
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WHERE zoom_level = 2
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UNION ALL
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SELECT * FROM water_z3
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WHERE zoom_level = 3
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UNION ALL
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SELECT * FROM water_z4
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WHERE zoom_level = 4
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UNION ALL
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SELECT * FROM water_z5
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WHERE zoom_level = 5
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UNION ALL
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SELECT * FROM water_z6
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WHERE zoom_level = 6
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UNION ALL
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SELECT ST_SimplifyPreserveTopology(geom, 200) AS geom FROM water_z8
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WHERE zoom_level = 8
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UNION ALL
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SELECT ST_SimplifyPreserveTopology(geom, 100) AS geom FROM water_z8
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WHERE zoom_level BETWEEN 9 AND 10
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UNION ALL
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SELECT * FROM water_z11
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WHERE zoom_level = 11
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UNION ALL
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SELECT * FROM water_z12
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WHERE zoom_level = 12
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UNION ALL
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SELECT * FROM water_z13
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WHERE zoom_level = 13
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UNION ALL
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SELECT * FROM water_z14
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WHERE zoom_level >= 14
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)
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SELECT geom FROM zoom_levels
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WHERE geom && bbox;
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$$ LANGUAGE SQL;
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