70 lines
2.6 KiB
PL/PgSQL
70 lines
2.6 KiB
PL/PgSQL
CREATE OR REPLACE VIEW waterway_z3 AS (
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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 waterway_z4 AS (
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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 waterway_z6 AS (
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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 waterway_z8 AS (
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SELECT ST_Simplify(geometry, 200) AS geom, waterway AS class FROM osm_waterway_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 waterway_z8_geom_idx ON waterway_z8 USING gist(geom);
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CREATE TABLE IF NOT EXISTS waterway_z9 AS (
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SELECT ST_Simplify(geometry, 100) AS geom, waterway AS class FROM osm_waterway_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 waterway_z9_geom_idx ON waterway_z9 USING gist(geom);
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CREATE OR REPLACE VIEW waterway_z11 AS (
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SELECT geometry AS geom, waterway AS class FROM osm_waterway_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 waterway_z12 AS (
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SELECT geometry AS geom, waterway AS class FROM osm_waterway_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 waterway_z13 AS (
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SELECT geometry AS geom, waterway AS class FROM osm_waterway_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 waterway_z14 AS (
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SELECT geometry AS geom, waterway AS class FROM osm_waterway_linestring
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);
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CREATE OR REPLACE FUNCTION layer_waterway(bbox geometry, zoom_level int)
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RETURNS TABLE(geom geometry, waterway text) AS $$
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SELECT geom, class FROM (
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SELECT * FROM waterway_z3 WHERE zoom_level = 3
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UNION ALL
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SELECT * FROM waterway_z4 WHERE zoom_level BETWEEN 4 AND 5
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UNION ALL
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SELECT * FROM waterway_z6 WHERE zoom_level BETWEEN 6 AND 7
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UNION ALL
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SELECT * FROM waterway_z8 WHERE zoom_level = 8
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UNION ALL
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SELECT * FROM waterway_z9 WHERE zoom_level BETWEEN 9 AND 10
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UNION ALL
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SELECT * FROM waterway_z11 WHERE zoom_level = 11
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UNION ALL
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SELECT * FROM waterway_z12 WHERE zoom_level = 12
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UNION ALL
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SELECT * FROM waterway_z13 WHERE zoom_level = 13
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UNION ALL
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SELECT * FROM waterway_z14 WHERE zoom_level >= 14
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) AS zoom_levels
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WHERE geom && bbox;
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$$ LANGUAGE SQL IMMUTABLE;
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