91 lines
3.7 KiB
PL/PgSQL
91 lines
3.7 KiB
PL/PgSQL
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-- etldoc: ne_110m_rivers_lake_centerlines -> waterway_z3
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CREATE OR REPLACE VIEW waterway_z3 AS (
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SELECT geom AS geometry, 'river'::text AS class FROM ne_110m_rivers_lake_centerlines
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WHERE featurecla = 'River'
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);
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-- etldoc: ne_50m_rivers_lake_centerlines -> waterway_z4
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CREATE OR REPLACE VIEW waterway_z4 AS (
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SELECT geom AS geometry, 'river'::text AS class FROM ne_50m_rivers_lake_centerlines
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WHERE featurecla = 'River'
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);
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-- etldoc: ne_10m_rivers_lake_centerlines -> waterway_z6
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CREATE OR REPLACE VIEW waterway_z6 AS (
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SELECT geom AS geometry, 'river'::text AS class FROM ne_10m_rivers_lake_centerlines
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WHERE featurecla = 'River'
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);
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-- etldoc: osm_waterway_linestring -> waterway_z8
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CREATE OR REPLACE VIEW waterway_z8 AS (
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SELECT geometry, waterway AS class FROM osm_waterway_linestring
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WHERE waterway IN ('river') AND ST_Length(geometry) > 10000
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);
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-- etldoc: osm_waterway_linestring -> waterway_z9
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CREATE OR REPLACE VIEW waterway_z9 AS (
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SELECT geometry, waterway AS class FROM osm_waterway_linestring
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WHERE waterway IN ('river') AND ST_Length(geometry) > 5000
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);
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-- etldoc: osm_waterway_linestring -> waterway_z11
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CREATE OR REPLACE VIEW waterway_z11 AS (
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SELECT geometry, waterway AS class FROM osm_waterway_linestring
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WHERE waterway IN ('river') AND ST_Length(geometry) > 5000
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);
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-- etldoc: osm_waterway_linestring -> waterway_z12
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CREATE OR REPLACE VIEW waterway_z12 AS (
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SELECT geometry, waterway AS class FROM osm_waterway_linestring
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WHERE waterway IN ('river', 'canal') OR (waterway = 'stream' AND ST_Length(geometry) > 1000)
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);
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-- etldoc: osm_waterway_linestring -> waterway_z13
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CREATE OR REPLACE VIEW waterway_z13 AS (
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SELECT geometry, waterway AS class FROM osm_waterway_linestring
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WHERE waterway IN ('river', 'canal', 'stream', 'drain', 'ditch') AND ST_Length(geometry) > 300
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);
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-- etldoc: osm_waterway_linestring -> waterway_z14
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CREATE OR REPLACE VIEW waterway_z14 AS (
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SELECT geometry, waterway AS class FROM osm_waterway_linestring
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);
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-- etldoc: layer_waterway[shape=record fillcolor=lightpink, style="rounded,filled",
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-- etldoc: label="layer_waterway | <z3> z3 |<z4_5> z4_5 |<z6_7> z6_7 | <z8> z8 |<z9_10> z9_10 |<z11> z11 |<z12> z12|<z13> z13|<z14_> z14_" ] ;
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CREATE OR REPLACE FUNCTION layer_waterway(bbox geometry, zoom_level int)
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RETURNS TABLE(geometry geometry, class text) AS $$
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SELECT geometry, class FROM (
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-- etldoc: waterway_z3 -> layer_waterway:z3
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SELECT * FROM waterway_z3 WHERE zoom_level = 3
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UNION ALL
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-- etldoc: waterway_z4 -> layer_waterway:z4_5
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SELECT * FROM waterway_z4 WHERE zoom_level BETWEEN 4 AND 5
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UNION ALL
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-- etldoc: waterway_z6 -> layer_waterway:z6_7
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SELECT * FROM waterway_z6 WHERE zoom_level BETWEEN 6 AND 7
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UNION ALL
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-- etldoc: waterway_z8 -> layer_waterway:z8
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SELECT * FROM waterway_z8 WHERE zoom_level = 8
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UNION ALL
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-- etldoc: waterway_z9 -> layer_waterway:z9_10
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SELECT * FROM waterway_z9 WHERE zoom_level BETWEEN 9 AND 10
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UNION ALL
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-- etldoc: waterway_z11 -> layer_waterway:z11
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SELECT * FROM waterway_z11 WHERE zoom_level = 11
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UNION ALL
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-- etldoc: waterway_z12 -> layer_waterway:z12
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SELECT * FROM waterway_z12 WHERE zoom_level = 12
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UNION ALL
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-- etldoc: waterway_z13 -> layer_waterway:z13
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SELECT * FROM waterway_z13 WHERE zoom_level = 13
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UNION ALL
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-- etldoc: waterway_z14 -> layer_waterway:z14_
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SELECT * FROM waterway_z14 WHERE zoom_level >= 14
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) AS zoom_levels
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WHERE geometry && bbox;
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$$ LANGUAGE SQL IMMUTABLE;
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