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Generalise water zoom level views directly

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This commit is contained in:
lukasmartinelli 2016-10-08 21:20:19 +02:00
parent 7ddb240559
commit e832f5d811
1 changed files with 14 additions and 10 deletions
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24
schema/layers/water.sql
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@ -52,21 +52,25 @@ CREATE OR REPLACE VIEW water_z6 AS (
WHERE featurecla = 'River' WHERE featurecla = 'River'
); );
CREATE OR REPLACE VIEW water_z8 AS ( CREATE TABLE IF NOT EXISTS water_z8 AS (
SELECT way AS geom FROM water_areas SELECT geom FROM ne_10m_ocean
UNION ALL
SELECT ST_SimplifyPreserveTopology(way, 200) AS geom FROM water_areas
WHERE way_area > 1000000 WHERE way_area > 1000000
UNION ALL UNION ALL
SELECT way AS geom FROM waterways SELECT ST_Simplify(way, 200) AS geom FROM waterways
WHERE waterway IN ('river') AND ST_Length(way) > 10000 WHERE waterway IN ('river') AND ST_Length(way) > 10000
); );
CREATE INDEX IF NOT EXISTS water_z8_geom_idx ON water_z8 USING gist(geom);
CREATE OR REPLACE VIEW water_z9 AS ( CREATE TABLE IF NOT EXISTS water_z9 AS (
SELECT way AS geom FROM water_areas SELECT ST_SimplifyPreserveTopology(way, 100) AS geom FROM water_areas
WHERE way_area > 500000 WHERE way_area > 500000
UNION ALL UNION ALL
SELECT way AS geom FROM waterways SELECT ST_Simplify(way,100) AS geom FROM waterways
WHERE waterway IN ('river') AND ST_Length(way) > 5000 WHERE waterway IN ('river') AND ST_Length(way) > 5000
); );
CREATE INDEX IF NOT EXISTS water_z9_geom_idx ON water_z9 USING gist(geom);
CREATE OR REPLACE VIEW water_z11 AS ( CREATE OR REPLACE VIEW water_z11 AS (
SELECT way AS geom FROM water_areas SELECT way AS geom FROM water_areas
@ -120,12 +124,12 @@ RETURNS TABLE(geom geometry) AS $$
WHERE zoom_level = 5 WHERE zoom_level = 5
UNION ALL UNION ALL
SELECT * FROM water_z6 SELECT * FROM water_z6
WHERE zoom_level = 6 WHERE zoom_level BETWEEN 6 AND 7
UNION ALL UNION ALL
SELECT ST_SimplifyPreserveTopology(geom, 200) AS geom FROM water_z8 SELECT geom FROM water_z8
WHERE zoom_level = 8 WHERE zoom_level = 8
UNION ALL UNION ALL
SELECT ST_SimplifyPreserveTopology(geom, 100) AS geom FROM water_z8 SELECT geom FROM water_z9
WHERE zoom_level BETWEEN 9 AND 10 WHERE zoom_level BETWEEN 9 AND 10
UNION ALL UNION ALL
SELECT * FROM water_z11 SELECT * FROM water_z11
@ -142,4 +146,4 @@ RETURNS TABLE(geom geometry) AS $$
) )
SELECT geom FROM zoom_levels SELECT geom FROM zoom_levels
WHERE geom && bbox; WHERE geom && bbox;
$$ LANGUAGE SQL; $$ LANGUAGE SQL IMMUTABLE;