kopia lustrzana https://github.com/openmaptiles/openmaptiles
84 wiersze
2.8 KiB
PL/PgSQL
84 wiersze
2.8 KiB
PL/PgSQL
DROP TRIGGER IF EXISTS trigger_flag ON osm_country_point;
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DROP TRIGGER IF EXISTS trigger_refresh ON place_country.updates;
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ALTER TABLE osm_country_point DROP CONSTRAINT IF EXISTS osm_country_point_rank_constraint;
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-- etldoc: ne_10m_admin_0_countries -> osm_country_point
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-- etldoc: osm_country_point -> osm_country_point
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CREATE OR REPLACE FUNCTION update_osm_country_point() RETURNS VOID AS $$
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BEGIN
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WITH important_country_point AS (
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SELECT osm.geometry, osm.osm_id, osm.name, COALESCE(NULLIF(osm.name_en, ''), ne.name) AS name_en, ne.scalerank, ne.labelrank
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FROM ne_10m_admin_0_countries AS ne, osm_country_point AS osm
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WHERE
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-- We only match whether the point is within the Natural Earth polygon
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-- because name matching is to difficult since OSM does not contain good
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-- enough coverage of ISO codesy
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ST_Within(osm.geometry, ne.geometry)
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-- We leave out tiny countries
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AND ne.scalerank <= 1
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)
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UPDATE osm_country_point AS osm
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-- Normalize both scalerank and labelrank into a ranking system from 1 to 6
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-- where the ranks are still distributed uniform enough across all countries
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SET "rank" = LEAST(6, CEILING((scalerank + labelrank)/2.0))
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FROM important_country_point AS ne
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WHERE osm.osm_id = ne.osm_id;
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UPDATE osm_country_point AS osm
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SET "rank" = 6
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WHERE "rank" IS NULL;
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-- TODO: This shouldn't be necessary? The rank function makes something wrong...
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UPDATE osm_country_point AS osm
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SET "rank" = 1
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WHERE "rank" = 0;
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UPDATE osm_country_point
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SET tags = delete_empty_keys(tags) || get_basic_names(tags, geometry)
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WHERE COALESCE(tags->'name:latin', tags->'name:nonlatin', tags->'name_int') IS NULL;
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END;
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$$ LANGUAGE plpgsql;
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SELECT update_osm_country_point();
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-- ALTER TABLE osm_country_point ADD CONSTRAINT osm_country_point_rank_constraint CHECK("rank" BETWEEN 1 AND 6);
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CREATE INDEX IF NOT EXISTS osm_country_point_rank_idx ON osm_country_point("rank");
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-- Handle updates
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CREATE SCHEMA IF NOT EXISTS place_country;
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CREATE TABLE IF NOT EXISTS place_country.updates(id serial primary key, t text, unique (t));
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CREATE OR REPLACE FUNCTION place_country.flag() RETURNS trigger AS $$
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BEGIN
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INSERT INTO place_country.updates(t) VALUES ('y') ON CONFLICT(t) DO NOTHING;
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RETURN null;
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END;
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$$ language plpgsql;
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CREATE OR REPLACE FUNCTION place_country.refresh() RETURNS trigger AS
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$BODY$
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BEGIN
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RAISE LOG 'Refresh place_country rank';
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PERFORM update_osm_country_point();
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DELETE FROM place_country.updates;
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RETURN null;
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END;
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$BODY$
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language plpgsql;
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CREATE TRIGGER trigger_flag
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AFTER INSERT OR UPDATE OR DELETE ON osm_country_point
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FOR EACH STATEMENT
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EXECUTE PROCEDURE place_country.flag();
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CREATE CONSTRAINT TRIGGER trigger_refresh
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AFTER INSERT ON place_country.updates
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INITIALLY DEFERRED
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FOR EACH ROW
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EXECUTE PROCEDURE place_country.refresh();
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