kopia lustrzana https://github.com/openmaptiles/openmaptiles
45 wiersze
2.1 KiB
SQL
45 wiersze
2.1 KiB
SQL
-- We merge the waterways by name like the highways
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-- This helps to drop not important rivers (since they do not have a name)
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-- and also makes it possible to filter out too short rivers
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-- etldoc: osm_waterway_linestring -> osm_important_waterway_linestring
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CREATE TABLE IF NOT EXISTS osm_important_waterway_linestring AS (
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SELECT
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(ST_Dump(geometry)).geom AS geometry,
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name
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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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FROM osm_waterway_linestring
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WHERE name <> '' AND waterway = 'river'
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GROUP BY name
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) AS waterway_union
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);
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CREATE INDEX IF NOT EXISTS osm_important_waterway_linestring_geometry_idx ON osm_important_waterway_linestring USING gist(geometry);
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-- etldoc: osm_important_waterway_linestring -> osm_important_waterway_linestring_gen1
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CREATE TABLE IF NOT EXISTS osm_important_waterway_linestring_gen1 AS (
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SELECT ST_Simplify(geometry, 60) AS geometry, name
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FROM osm_important_waterway_linestring
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WHERE ST_Length(geometry) > 1000
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);
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CREATE INDEX IF NOT EXISTS osm_important_waterway_linestring_gen1_geometry_idx ON osm_important_waterway_linestring_gen1 USING gist(geometry);
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-- etldoc: osm_important_waterway_linestring_gen1 -> osm_important_waterway_linestring_gen2
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CREATE TABLE IF NOT EXISTS osm_important_waterway_linestring_gen2 AS (
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SELECT ST_Simplify(geometry, 100) AS geometry, name
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FROM osm_important_waterway_linestring_gen1
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WHERE ST_Length(geometry) > 4000
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);
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CREATE INDEX IF NOT EXISTS osm_important_waterway_linestring_gen2_geometry_idx ON osm_important_waterway_linestring_gen2 USING gist(geometry);
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-- etldoc: osm_important_waterway_linestring_gen2 -> osm_important_waterway_linestring_gen3
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CREATE TABLE IF NOT EXISTS osm_important_waterway_linestring_gen3 AS (
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SELECT ST_Simplify(geometry, 200) AS geometry, name
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FROM osm_important_waterway_linestring_gen2
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WHERE ST_Length(geometry) > 8000
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);
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CREATE INDEX IF NOT EXISTS osm_important_waterway_linestring_gen3_geometry_idx ON osm_important_waterway_linestring_gen3 USING gist(geometry);
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