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Extract boundary into table function

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This commit is contained in:
lukasmartinelli
2016-10-08 16:30:11 +02:00
parent 66d4405ed3
commit dea365463f
2 changed files with 39 additions and 36 deletions
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37
schema/layers/boundary.sql
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@@ -85,3 +85,40 @@ CREATE OR REPLACE VIEW boundary_z10 AS (
FROM admin_line
WHERE level <= 8
);
CREATE OR REPLACE FUNCTION layer_boundary (bbox geometry, zoom_level int)
RETURNS TABLE(geom geometry, admin_level int, scalerank int, class text) AS $$
WITH zoom_levels AS (
SELECT * FROM boundary_z0 WHERE zoom_level = 0
UNION ALL
SELECT * FROM boundary_z1 WHERE zoom_level BETWEEN 1 AND 2
UNION ALL
SELECT * FROM boundary_z3 WHERE zoom_level = 3
UNION ALL
SELECT * FROM boundary_z4 WHERE zoom_level = 4
UNION ALL
SELECT * FROM boundary_z5 WHERE zoom_level BETWEEN 5 AND 6
UNION ALL
SELECT * FROM boundary_z7 WHERE zoom_level = 7
UNION ALL
SELECT ST_Simplify(geom, 400) AS geom, admin_level, scalerank, class
FROM boundary_z8 WHERE zoom_level = 8
UNION ALL
SELECT ST_Simplify(geom, 320) AS geom, admin_level, scalerank, class
FROM boundary_z8 WHERE zoom_level = 9
UNION ALL
SELECT ST_Simplify(geom, 150) AS geom, admin_level, scalerank, class
FROM boundary_z10 WHERE zoom_level = 10
UNION ALL
SELECT ST_Simplify(geom, 100) AS geom, admin_level, scalerank, class
FROM boundary_z10 WHERE zoom_level = 11
UNION ALL
SELECT ST_Simplify(geom, 50) AS geom, admin_level, scalerank, class
FROM boundary_z10 WHERE zoom_level = 12
UNION ALL
SELECT geom, admin_level, scalerank, class
FROM boundary_z10 WHERE zoom_level >= 13
)
SELECT geom, admin_level, scalerank::int, class FROM zoom_levels
WHERE geom && bbox;
$$ LANGUAGE SQL;