30 lines
978 B
SQL
30 lines
978 B
SQL
-- 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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CREATE TABLE IF NOT EXISTS osm_highway_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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highway,
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z_order
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FROM (
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SELECT
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ST_LineMerge(ST_Union(geometry)) AS geometry,
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name,
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highway,
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min(z_order) AS z_order,
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array_agg(DISTINCT osm_id) AS member_osm_ids
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FROM osm_highway_linestring
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-- We only care about roads for labelling
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WHERE name <> ''
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GROUP BY name, highway
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) AS highway_union
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);
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CREATE INDEX IF NOT EXISTS osm_highway_name_linestring_geometry_idx ON osm_important_place_point USING gist(geometry);
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