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Functions and triggers for state, country and city ranks

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stirringhalo
2017-01-05 08:59:15 -05:00
parent 9573aca4f2
commit c5f05e7c3a
3 changed files with 204 additions and 77 deletions
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92
layers/place/merge_country_rank.sql
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@@ -3,32 +3,74 @@ ALTER TABLE osm_country_point DROP CONSTRAINT IF EXISTS osm_country_point_rank_c
-- etldoc: ne_10m_admin_0_countries -> osm_country_point
-- etldoc: osm_country_point -> osm_country_point
WITH important_country_point AS (
SELECT osm.geometry, osm.osm_id, osm.name, COALESCE(NULLIF(osm.name_en, ''), ne.name) AS name_en, ne.scalerank, ne.labelrank
FROM ne_10m_admin_0_countries AS ne, osm_country_point AS osm
WHERE
-- We only match whether the point is within the Natural Earth polygon
-- because name matching is to difficult since OSM does not contain good
-- enough coverage of ISO codesy
ST_Within(osm.geometry, ne.geometry)
-- We leave out tiny countries
AND ne.scalerank <= 1
)
UPDATE osm_country_point AS osm
-- Normalize both scalerank and labelrank into a ranking system from 1 to 6
-- where the ranks are still distributed uniform enough across all countries
SET "rank" = LEAST(6, CEILING((scalerank + labelrank)/2.0))
FROM important_country_point AS ne
WHERE osm.osm_id = ne.osm_id;
CREATE FUNCTION update_osm_country_point() RETURNS VOID AS $$
BEGIN
UPDATE osm_country_point AS osm
SET "rank" = 6
WHERE "rank" IS NULL;
WITH important_country_point AS (
SELECT osm.geometry, osm.osm_id, osm.name, COALESCE(NULLIF(osm.name_en, ''), ne.name) AS name_en, ne.scalerank, ne.labelrank
FROM ne_10m_admin_0_countries AS ne, osm_country_point AS osm
WHERE
-- We only match whether the point is within the Natural Earth polygon
-- because name matching is to difficult since OSM does not contain good
-- enough coverage of ISO codesy
ST_Within(osm.geometry, ne.geometry)
-- We leave out tiny countries
AND ne.scalerank <= 1
)
UPDATE osm_country_point AS osm
-- Normalize both scalerank and labelrank into a ranking system from 1 to 6
-- where the ranks are still distributed uniform enough across all countries
SET "rank" = LEAST(6, CEILING((scalerank + labelrank)/2.0))
FROM important_country_point AS ne
WHERE osm.osm_id = ne.osm_id;
-- TODO: This shouldn't be necessary? The rank function makes something wrong...
UPDATE osm_country_point AS osm
SET "rank" = 1
WHERE "rank" = 0;
UPDATE osm_country_point AS osm
SET "rank" = 6
WHERE "rank" IS NULL;
ALTER TABLE osm_country_point ADD CONSTRAINT osm_country_point_rank_constraint CHECK("rank" BETWEEN 1 AND 6);
-- TODO: This shouldn't be necessary? The rank function makes something wrong...
UPDATE osm_country_point AS osm
SET "rank" = 1
WHERE "rank" = 0;
END;
$$ LANGUAGE plpgsql;
SELECT update_osm_country_point();
-- ALTER TABLE osm_country_point ADD CONSTRAINT osm_country_point_rank_constraint CHECK("rank" BETWEEN 1 AND 6);
CREATE INDEX IF NOT EXISTS osm_country_point_rank_idx ON osm_country_point("rank");
-- Handle updates
CREATE SCHEMA place_country;
CREATE TABLE IF NOT EXISTS place_country.updates(id serial primary key, t text, unique (t));
CREATE OR REPLACE FUNCTION place_country.flag() RETURNS trigger AS $$
BEGIN
INSERT INTO place_country.updates(t) VALUES ('y') ON CONFLICT(t) DO NOTHING;
RETURN null;
END;
$$ language plpgsql;
CREATE OR REPLACE FUNCTION place_country.refresh() RETURNS trigger AS
$BODY$
BEGIN
RAISE LOG 'Refresh place_country rank';
SELECT update_osm_country_point();
DELETE FROM place_country.updates;
RETURN null;
END;
$BODY$
language plpgsql;
CREATE TRIGGER trigger_flag
AFTER INSERT OR UPDATE OR DELETE ON osm_country_point
FOR EACH STATEMENT
EXECUTE PROCEDURE place_country.flag();
CREATE CONSTRAINT TRIGGER trigger_refresh
AFTER INSERT ON place_country.updates
INITIALLY DEFERRED
FOR EACH ROW
EXECUTE PROCEDURE place_country.refresh();