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Introduce landcover classes

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This commit is contained in:
lukasmartinelli
2016-10-24 14:27:51 +02:00
parent 15a61983ae
commit f65fded9f4
3 changed files with 54 additions and 44 deletions
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53
layers/landcover/landcover.sql
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@@ -1,41 +1,48 @@
CREATE OR REPLACE FUNCTION landcover_class(landuse VARCHAR, "natural" VARCHAR, wetland VARCHAR) RETURNS TEXT AS $$
SELECT CASE
WHEN landuse IN ('farmland', 'farm', 'orchard', 'vineyard', 'plant_nursery') THEN 'farmland'
WHEN "natural" IN ('glacier', 'ice_shelf') THEN 'ice'
WHEN "natural"='wood' OR landuse IN ('forest', 'wood') THEN 'wood'
WHEN "natural"='grassland' OR landuse IN ('grass', 'meadow', 'village_green', 'allotments', 'park', 'recreation_ground', 'grassland') THEN 'grass'
WHEN "natural"='wetland' OR wetland IN ('bog', 'swamp', 'wet_meadow', 'marsh', 'reedbed', 'saltern', 'tidalflat', 'saltmarsh', 'mangrove') THEN 'wetland'
ELSE NULL
END;
$$ LANGUAGE SQL IMMUTABLE;
CREATE OR REPLACE VIEW landcover_z0 AS (
SELECT NULL::int AS osm_id, geom AS geometry, 'glacier' AS landuse, NULL AS "natural", NULL AS wetland FROM ne_110m_glaciated_areas
SELECT NULL::int AS osm_id, geom AS geometry, NULL AS landuse, 'glacier' AS "natural", NULL::text AS wetland FROM ne_110m_glaciated_areas
);
CREATE OR REPLACE VIEW landcover_z2 AS (
SELECT NULL::int AS osm_id, geom AS geometry, 'glacier' AS landuse, NULL AS "natural", NULL AS wetland FROM ne_50m_glaciated_areas
SELECT NULL::bigint AS osm_id, geom AS geometry, NULL::text AS landuse, 'glacier' AS "natural", NULL::text AS wetland FROM ne_50m_glaciated_areas
UNION ALL
SELECT NULL::int AS osm_id, geom AS geometry, 'ice_shelf' AS landuse, NULL AS "natural", NULL AS wetland FROM ne_50m_antarctic_ice_shelves_polys
SELECT NULL::bigint AS osm_id, geom AS geometry, NULL::text AS landuse, 'ice_shelf' AS "natural", NULL::text AS wetland FROM ne_50m_antarctic_ice_shelves_polys
);
CREATE OR REPLACE VIEW landcover_z5 AS (
SELECT NULL::int AS osm_id, geom AS geometry, 'glacier' AS landuse, NULL AS "natural", NULL AS wetland FROM ne_10m_glaciated_areas
SELECT NULL::bigint AS osm_id, geom AS geometry, NULL::text AS landuse, 'glacier' AS "natural", NULL::text AS wetland FROM ne_10m_glaciated_areas
UNION ALL
SELECT NULL::int AS osm_id, geom AS geometry, 'ice_shelf' AS landuse, NULL AS "natural", NULL AS wetland FROM ne_10m_antarctic_ice_shelves_polys
SELECT NULL::bigint AS osm_id, geom AS geometry, NULL::text AS landuse, 'ice_shelf' AS "natural", NULL::text AS wetland FROM ne_10m_antarctic_ice_shelves_polys
);
CREATE OR REPLACE VIEW landcover_z8 AS (
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon
WHERE ST_Area(geometry) > 15000000
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon_gen5
);
CREATE OR REPLACE VIEW landcover_z9 AS (
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon
WHERE ST_Area(geometry) > 4200000
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon_gen4
);
CREATE OR REPLACE VIEW landcover_z10 AS (
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon
WHERE ST_Area(geometry) > 1200000
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon_gen3
);
CREATE OR REPLACE VIEW landcover_z11 AS (
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon WHERE ST_Area(geometry) > 480000
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon_gen2
);
CREATE OR REPLACE VIEW landcover_z12 AS (
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon WHERE ST_Area(geometry) > 240000
SELECT osm_id, geometry, landuse, "natural", wetland FROM osm_landcover_polygon_gen1
);
CREATE OR REPLACE VIEW landcover_z13 AS (
@@ -47,8 +54,11 @@ CREATE OR REPLACE VIEW landcover_z14 AS (
);
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 $$
SELECT osm_id, geometry, landuse, "natural", wetland FROM (
RETURNS TABLE(osm_id bigint, geometry geometry, class text, subclass text) AS $$
SELECT osm_id, geometry,
landcover_class(landuse, "natural", wetland) AS class,
COALESCE(NULLIF("natural", ''), NULLIF(landuse, ''), NULLIF('wetland', '')) AS subclass
FROM (
SELECT * FROM landcover_z0
WHERE zoom_level BETWEEN 0 AND 1 AND geometry && bbox
UNION ALL
@@ -58,19 +68,19 @@ RETURNS TABLE(osm_id bigint, geom geometry, landuse text, "natural" text, wetlan
SELECT * FROM landcover_z5
WHERE zoom_level BETWEEN 5 AND 7 AND geometry && bbox
UNION ALL
SELECT osm_id, ST_Simplify(geometry, 300) AS geometry, landuse, "natural", wetland
SELECT osm_id, 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
SELECT osm_id, 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
SELECT osm_id, 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
SELECT osm_id, 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
SELECT osm_id, 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
@@ -80,4 +90,3 @@ RETURNS TABLE(osm_id bigint, geom geometry, landuse text, "natural" text, wetlan
FROM landcover_z14 WHERE zoom_level >= 14 AND geometry && bbox
) AS zoom_levels;
$$ LANGUAGE SQL IMMUTABLE;