67 lines
1.9 KiB
SQL
67 lines
1.9 KiB
SQL
\c gis postgres
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----------- Collect city polygons
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CREATE TABLE osm_cities AS
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SELECT
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osm_id,
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place,
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'polygon'::text AS g_type, -- geometry_type
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max(regexp_replace(population, '[ .,]+', '', 'g')::int) AS population,
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ST_Buffer(ST_Transform(ST_Collect(way),4326), 0) AS way,
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coalesce(max("name"), max("name:en")) AS name
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FROM planet_osm_polygon
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WHERE place IN ('city', 'town')
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AND regexp_replace(population, '[ .,]+', '', 'g') ~ '^\d+$'
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GROUP BY osm_id, place;
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----------- Collect city nodes
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INSERT INTO osm_cities
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SELECT
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osm_id,
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place,
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'point'::text AS g_type, -- geometry_type
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regexp_replace(population, '[ .,]+', '', 'g')::int AS population,
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ST_Transform(way,4326) AS way,
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coalesce("name", "name:en") AS name
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FROM planet_osm_point
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WHERE place IN ('city', 'town')
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AND regexp_replace(population, '[ .,]+', '', 'g') ~ '^\d+$';
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create index osm_cities_gist_idx on osm_cities using gist(way);
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-- Delete polygons where exists a node within it with the same name
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DELETE from osm_cities WHERE g_type='polygon' and osm_id IN
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(
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SELECT p.osm_id
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FROM osm_cities n, osm_cities p
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WHERE p.g_type='polygon' AND n.g_type='point'
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AND ST_Contains(p.way, n.way)
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AND (strpos(n.name, p.name) > 0 OR strpos(p.name, n.name) > 0)
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);
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-- Convert [multi]polygons to points - for further faster requests "is city in region"
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ALTER TABLE osm_cities ADD COLUMN center geometry;
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UPDATE osm_cities c SET center =
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(
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CASE WHEN ST_Contains(way, ST_Centroid(way)) --true for 42972 out of 42999
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THEN ST_Centroid(way)
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-- for the rest 27 cities choose arbitrary point as a center
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ELSE (
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SELECT (ST_DumpPoints(way)).geom
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FROM osm_cities
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WHERE osm_id = c.osm_id
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LIMIT 1
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)
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END
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);
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CREATE INDEX osm_cities_center_gist_idx ON osm_cities USING gist(center);
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DROP INDEX osm_cities_gist_idx;
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ALTER TABLE osm_cities DROP column way;
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