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Simplify building layer

pull/24/head
lukasmartinelli 2016-10-30 16:30:55 +01:00
rodzic 0ab16b3570
commit 0379bde353
1 zmienionych plików z 3 dodań i 12 usunięć
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15
layers/building/building.sql
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@ -1,22 +1,13 @@
CREATE OR REPLACE VIEW building_z13 AS (
SELECT osm_id, geometry, height, levels FROM osm_building_polygon_gen1 WHERE area > 1400
);
CREATE OR REPLACE VIEW building_z14 AS (
SELECT osm_id, geometry, height, levels FROM osm_building_polygon
);
CREATE OR REPLACE FUNCTION layer_building(bbox geometry, zoom_level int)
RETURNS TABLE(geom geometry, osm_id bigint, render_height numeric) AS $$
SELECT geometry, osm_id,
least(greatest(3, COALESCE(height, levels*3.66,5)),400)^.7::int AS render_height
FROM (
SELECT osm_id, ST_Simplify(geometry, 10) AS geometry, height, levels FROM building_z13
WHERE zoom_level = 13 AND geometry && bbox
SELECT osm_id, geometry, height, levels FROM osm_building_polygon_gen1
WHERE zoom_level = 13 AND geometry && bbox AND area > 1400
UNION ALL
SELECT * FROM building_z14
SELECT osm_id, geometry, height, levels FROM osm_building_polygon
WHERE zoom_level >= 14 AND geometry && bbox
) AS zoom_levels
ORDER BY render_height ASC, ST_YMin(geometry) DESC;
$$ LANGUAGE SQL IMMUTABLE;