76 lines
2.7 KiB
PL/PgSQL
76 lines
2.7 KiB
PL/PgSQL
CREATE OR REPLACE FUNCTION landuse_class(landuse TEXT, amenity TEXT) RETURNS TEXT AS $$
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SELECT CASE
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WHEN amenity IN ('school', 'university', 'kindergarten', 'college', 'library') THEN 'school'
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WHEN landuse IN('hospital', 'railway', 'cemetery', 'military', 'residential') THEN landuse
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ELSE NULL
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END;
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$$ LANGUAGE SQL IMMUTABLE;
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CREATE OR REPLACE VIEW landuse_z4 AS (
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SELECT NULL::bigint AS osm_id, geom AS geometry, 'residential' AS landuse, NULL::text AS amenity, scalerank
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FROM ne_50m_urban_areas
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WHERE scalerank <= 2
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);
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CREATE OR REPLACE VIEW landuse_z5 AS (
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SELECT NULL::bigint AS osm_id, geom AS geometry, 'residential' AS landuse, NULL::text AS amenity, scalerank
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FROM ne_50m_urban_areas
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);
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CREATE OR REPLACE VIEW landuse_z6 AS (
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SELECT NULL::bigint AS osm_id, geom AS geometry, 'residential' AS landuse, NULL::text AS amenity, scalerank
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FROM ne_10m_urban_areas
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);
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CREATE OR REPLACE VIEW landuse_z10 AS (
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SELECT osm_id, geometry, landuse, amenity, NULL::int as scalerank FROM osm_landuse_polygon_gen2
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WHERE ST_Area(geometry) > 1200000
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);
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CREATE OR REPLACE VIEW landuse_z11 AS (
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SELECT osm_id, geometry, landuse, amenity, NULL::int as scalerank FROM osm_landuse_polygon_gen2
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WHERE ST_Area(geometry) > 480000
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);
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CREATE OR REPLACE VIEW landuse_z12 AS (
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SELECT osm_id, geometry, landuse, amenity, NULL::int as scalerank FROM osm_landuse_polygon_gen1
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WHERE ST_Area(geometry) > 240000
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);
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CREATE OR REPLACE VIEW landuse_z13 AS (
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SELECT osm_id, geometry, landuse, amenity, NULL::int as scalerank FROM osm_landuse_polygon
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WHERE ST_Area(geometry) > 60000
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);
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CREATE OR REPLACE VIEW landuse_z14 AS (
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SELECT osm_id, geometry, landuse, amenity, NULL::int as scalerank FROM osm_landuse_polygon
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);
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CREATE OR REPLACE FUNCTION layer_landuse(bbox geometry, zoom_level int)
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RETURNS TABLE(osm_id bigint, geometry geometry, class text, subclass text) AS $$
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SELECT osm_id, geometry,
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landuse_class(landuse, amenity) AS class,
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COALESCE(NULLIF(landuse, ''), NULLIF(amenity, '')) AS subclass
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FROM (
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SELECT * FROM landuse_z4
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WHERE zoom_level = 4
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UNION ALL
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SELECT * FROM landuse_z5
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WHERE zoom_level = 5
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UNION ALL
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SELECT * FROM landuse_z6
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WHERE zoom_level BETWEEN 6 AND 10 AND scalerank-1 <= zoom_level
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UNION ALL
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SELECT * FROM landuse_z10 WHERE zoom_level = 10
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UNION ALL
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SELECT * FROM landuse_z11 WHERE zoom_level = 11
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UNION ALL
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SELECT * FROM landuse_z12 WHERE zoom_level = 12
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UNION ALL
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SELECT * FROM landuse_z13 WHERE zoom_level = 13
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UNION ALL
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SELECT * FROM landuse_z14 WHERE zoom_level >= 14
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) AS zoom_levels;
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$$ LANGUAGE SQL IMMUTABLE;
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