14 lines
665 B
PL/PgSQL
14 lines
665 B
PL/PgSQL
CREATE OR REPLACE FUNCTION layer_building(bbox geometry, zoom_level int)
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RETURNS TABLE(geom geometry, osm_id bigint, render_height numeric) AS $$
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SELECT geometry, osm_id,
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least(greatest(3, COALESCE(height, levels*3.66,5)),400)^.7::int AS render_height
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FROM (
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SELECT osm_id, geometry, height, levels FROM osm_building_polygon_gen1
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WHERE zoom_level = 13 AND geometry && bbox AND area > 1400
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UNION ALL
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SELECT osm_id, geometry, height, levels FROM osm_building_polygon
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WHERE zoom_level >= 14 AND geometry && bbox
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) AS zoom_levels
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ORDER BY render_height ASC, ST_YMin(geometry) DESC;
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$$ LANGUAGE SQL IMMUTABLE;
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