65 lines
2.1 KiB
PL/PgSQL
65 lines
2.1 KiB
PL/PgSQL
CREATE OR REPLACE VIEW landuse_z4 AS (
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SELECT NULL::bigint AS osm_id, geom AS geometry, 'residential' AS landuse, 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, 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, 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, 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, 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, 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, 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, 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, landuse text) AS $$
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SELECT osm_id, geometry, landuse FROM (
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SELECT * FROM landuse_z4
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WHERE zoom_level = 4
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UNION ALL
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SELECT * FROM landuse_z5
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WHERE zoom_level = 5
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UNION ALL
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SELECT * FROM landuse_z6
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WHERE zoom_level BETWEEN 6 AND 10 AND scalerank-1 <= zoom_level
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UNION ALL
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SELECT * FROM landuse_z10 WHERE zoom_level = 10
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UNION ALL
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SELECT * FROM landuse_z11 WHERE zoom_level = 11
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UNION ALL
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SELECT * FROM landuse_z12 WHERE zoom_level = 12
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UNION ALL
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SELECT * FROM landuse_z13 WHERE zoom_level = 13
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UNION ALL
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SELECT * FROM landuse_z14 WHERE zoom_level >= 14
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) AS zoom_levels;
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$$ LANGUAGE SQL IMMUTABLE;
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