106 lines
4.7 KiB
PL/PgSQL
106 lines
4.7 KiB
PL/PgSQL
DROP TRIGGER IF EXISTS trigger_flag ON osm_highway_linestring;
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DROP TRIGGER IF EXISTS trigger_refresh ON transportation_name.updates;
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-- Instead of using relations to find out the road names we
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-- stitch together the touching ways with the same name
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-- to allow for nice label rendering
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-- Because this works well for roads that do not have relations as well
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DROP MATERIALIZED VIEW IF EXISTS osm_transportation_name_linestring CASCADE;
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DROP MATERIALIZED VIEW IF EXISTS osm_transportation_name_linestring_gen1 CASCADE;
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DROP MATERIALIZED VIEW IF EXISTS osm_transportation_name_linestring_gen2 CASCADE;
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DROP MATERIALIZED VIEW IF EXISTS osm_transportation_name_linestring_gen3 CASCADE;
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-- etldoc: osm_highway_linestring -> osm_transportation_name_linestring
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CREATE MATERIALIZED VIEW osm_transportation_name_linestring AS (
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SELECT
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(ST_Dump(geometry)).geom AS geometry,
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-- NOTE: The osm_id is no longer the original one which can make it difficult
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-- to lookup road names by OSM ID
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member_osm_ids[0] AS osm_id,
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member_osm_ids,
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name,
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name_en,
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ref,
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highway,
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network,
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z_order
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FROM (
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SELECT
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ST_LineMerge(ST_Collect(geometry)) AS geometry,
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hl.name,
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COALESCE(NULLIF(hl.name_en, ''), hl.name) AS name_en,
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hl.ref,
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hl.highway,
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min(rm.network) AS network, -- should be improved, may be part of more networks
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min(hl.z_order) AS z_order,
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array_agg(DISTINCT hl.osm_id) AS member_osm_ids
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FROM osm_highway_linestring hl
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left join osm_route_member rm on (rm.member = hl.osm_id)
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WHERE (hl.name <> '' OR hl.ref <> '')
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group by hl.name, name_en, hl.ref, hl.highway
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) AS highway_union
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);
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CREATE INDEX IF NOT EXISTS osm_transportation_name_linestring_geometry_idx ON osm_transportation_name_linestring USING gist(geometry);
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-- etldoc: osm_transportation_name_linestring -> osm_transportation_name_linestring_gen1
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CREATE MATERIALIZED VIEW osm_transportation_name_linestring_gen1 AS (
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SELECT ST_Simplify(geometry, 50) AS geometry, osm_id, member_osm_ids, name, name_en, ref, highway, network, z_order
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FROM osm_transportation_name_linestring
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WHERE highway IN ('motorway','trunk') AND ST_Length(geometry) > 8000
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);
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CREATE INDEX IF NOT EXISTS osm_transportation_name_linestring_gen1_geometry_idx ON osm_transportation_name_linestring_gen1 USING gist(geometry);
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-- etldoc: osm_transportation_name_linestring_gen1 -> osm_transportation_name_linestring_gen2
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CREATE MATERIALIZED VIEW osm_transportation_name_linestring_gen2 AS (
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SELECT ST_Simplify(geometry, 120) AS geometry, osm_id, member_osm_ids, name, name_en, ref, highway, network, z_order
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FROM osm_transportation_name_linestring_gen1
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WHERE highway IN ('motorway','trunk') AND ST_Length(geometry) > 14000
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);
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CREATE INDEX IF NOT EXISTS osm_transportation_name_linestring_gen2_geometry_idx ON osm_transportation_name_linestring_gen2 USING gist(geometry);
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-- etldoc: osm_transportation_name_linestring_gen2 -> osm_transportation_name_linestring_gen3
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CREATE MATERIALIZED VIEW osm_transportation_name_linestring_gen3 AS (
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SELECT ST_Simplify(geometry, 120) AS geometry, osm_id, member_osm_ids, name, name_en, ref, highway, network, z_order
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FROM osm_transportation_name_linestring_gen2
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WHERE highway = 'motorway' AND ST_Length(geometry) > 20000
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);
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CREATE INDEX IF NOT EXISTS osm_transportation_name_linestring_gen3_geometry_idx ON osm_transportation_name_linestring_gen3 USING gist(geometry);
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-- Handle updates
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CREATE SCHEMA IF NOT EXISTS transportation_name;
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CREATE TABLE IF NOT EXISTS transportation_name.updates(id serial primary key, t text, unique (t));
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CREATE OR REPLACE FUNCTION transportation_name.flag() RETURNS trigger AS $$
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BEGIN
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INSERT INTO transportation_name.updates(t) VALUES ('y') ON CONFLICT(t) DO NOTHING;
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RETURN null;
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END;
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$$ language plpgsql;
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CREATE OR REPLACE FUNCTION transportation_name.refresh() RETURNS trigger AS
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$BODY$
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BEGIN
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RAISE LOG 'Refresh transportation_name';
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REFRESH MATERIALIZED VIEW osm_transportation_name_linestring;
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REFRESH MATERIALIZED VIEW osm_transportation_name_linestring_gen1;
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REFRESH MATERIALIZED VIEW osm_transportation_name_linestring_gen2;
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REFRESH MATERIALIZED VIEW osm_transportation_name_linestring_gen3;
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DELETE FROM transportation_name.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_highway_linestring
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FOR EACH STATEMENT
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EXECUTE PROCEDURE transportation_name.flag();
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CREATE CONSTRAINT TRIGGER trigger_refresh
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AFTER INSERT ON transportation_name.updates
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INITIALLY DEFERRED
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FOR EACH ROW
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EXECUTE PROCEDURE transportation_name.refresh();
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