kopia lustrzana https://github.com/openmaptiles/openmaptiles
58 wiersze
2.7 KiB
MySQL
58 wiersze
2.7 KiB
MySQL
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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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-- etldoc: osm_transportation_linestring -> osm_transportation_name_linestring
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CREATE TABLE IF NOT EXISTS 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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ref,
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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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ref,
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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_transportation_linestring
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-- We only care about highways (not railways) for labeling
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WHERE (name <> '' OR ref <> '') AND NULLIF(highway, '') IS NOT NULL
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GROUP BY name, highway, ref
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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 TABLE IF NOT EXISTS osm_transportation_name_linestring_gen1 AS (
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SELECT ST_Simplify(geometry, 50) AS geometry, osm_id, member_osm_ids, name, ref, highway, 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 TABLE IF NOT EXISTS osm_transportation_name_linestring_gen2 AS (
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SELECT ST_Simplify(geometry, 120) AS geometry, osm_id, member_osm_ids, name, ref, highway, 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 TABLE IF NOT EXISTS osm_transportation_name_linestring_gen3 AS (
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SELECT ST_Simplify(geometry, 120) AS geometry, osm_id, member_osm_ids, name, ref, highway, 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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