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Add landcover layer

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lukasmartinelli
2016-10-10 20:37:23 +02:00
parent 8bc57e13e7
commit ade28316bd
3 changed files with 136 additions and 0 deletions
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57
layers/landcover/landcover.sql Normal file
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CREATE OR REPLACE VIEW landcover_z8 AS (
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon
WHERE ST_Area(geometry) > 15000000
);
CREATE OR REPLACE VIEW landcover_z9 AS (
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon
WHERE ST_Area(geometry) > 4200000
);
CREATE OR REPLACE VIEW landcover_z10 AS (
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon
WHERE ST_Area(geometry) > 1200000
);
CREATE OR REPLACE VIEW landcover_z11 AS (
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon WHERE ST_Area(geometry) > 480000
);
CREATE OR REPLACE VIEW landcover_z12 AS (
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon WHERE ST_Area(geometry) > 240000
);
CREATE OR REPLACE VIEW landcover_z13 AS (
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon WHERE ST_Area(geometry) > 60000
);
CREATE OR REPLACE VIEW landcover_z14 AS (
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon
);
CREATE OR REPLACE FUNCTION layer_landcover(bbox geometry, zoom_level int)
RETURNS TABLE(osm_id bigint, geom geometry, landuse text, "natural" text, wetland text) AS $$
SELECT osm_id, geometry, landuse, "natural", wetland FROM (
SELECT osm_id, ST_Simplify(geometry, 300) AS geometry, landuse, "natural", wetland
FROM landcover_z8 WHERE zoom_level = 8 AND geometry && bbox
UNION ALL
SELECT osm_id, ST_Simplify(geometry, 200) AS geometry, landuse, "natural", wetland
FROM landcover_z9 WHERE zoom_level = 9 AND geometry && bbox
UNION ALL
SELECT osm_id, ST_Simplify(geometry, 120) AS geometry, landuse, "natural", wetland
FROM landcover_z10 WHERE zoom_level = 10 AND geometry && bbox
UNION ALL
SELECT osm_id, ST_Simplify(geometry, 80) AS geometry, landuse, "natural", wetland
FROM landcover_z11 WHERE zoom_level = 11 AND geometry && bbox
UNION ALL
SELECT osm_id, ST_Simplify(geometry, 50) AS geometry, landuse, "natural", wetland
FROM landcover_z12 WHERE zoom_level = 12 AND geometry && bbox
UNION ALL
SELECT osm_id, ST_Simplify(geometry, 10) AS geometry, landuse, "natural", wetland
FROM landcover_z13 WHERE zoom_level = 13 AND geometry && bbox
UNION ALL
SELECT osm_id, geometry, landuse, "natural", wetland
FROM landcover_z14 WHERE zoom_level >= 14 AND geometry && bbox
) AS zoom_levels;
$$ LANGUAGE SQL IMMUTABLE;