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Filter out large rivers

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This commit is contained in:
lukasmartinelli
2016-10-28 16:53:29 +02:00
parent 5c58cb70e0
commit ea2530788f
3 changed files with 22 additions and 8 deletions
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13
layers/water/water.sql
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@@ -1,3 +1,8 @@
CREATE OR REPLACE FUNCTION water_class(waterway TEXT) RETURNS TEXT AS $$
SELECT CASE WHEN waterway='' THEN 'lake' ELSE 'river' END;
$$ LANGUAGE SQL IMMUTABLE;
CREATE OR REPLACE VIEW water_z0 AS (
SELECT geom, 'ocean' AS class FROM ne_110m_ocean
UNION ALL
@@ -51,19 +56,19 @@ CREATE OR REPLACE VIEW water_z9 AS (
);
CREATE OR REPLACE VIEW water_z11 AS (
SELECT geometry AS geom, 'lake' AS class FROM osm_water_polygon WHERE area > 40000
SELECT geometry AS geom, water_class(waterway) AS class FROM osm_water_polygon WHERE area > 40000
);
CREATE OR REPLACE VIEW water_z12 AS (
SELECT geometry AS geom, 'lake' AS class FROM osm_water_polygon WHERE area > 10000
SELECT geometry AS geom, water_class(waterway) AS class FROM osm_water_polygon WHERE area > 10000
);
CREATE OR REPLACE VIEW water_z13 AS (
SELECT geometry AS geom, 'lake' AS class FROM osm_water_polygon WHERE area > 5000
SELECT geometry AS geom, water_class(waterway) AS class FROM osm_water_polygon WHERE area > 5000
);
CREATE OR REPLACE VIEW water_z14 AS (
SELECT geometry AS geom, 'lake' AS class FROM osm_water_polygon
SELECT geometry AS geom, water_class(waterway) AS class FROM osm_water_polygon
);
CREATE OR REPLACE FUNCTION layer_water (bbox geometry, zoom_level int)