62 lines
2.8 KiB
PL/PgSQL
62 lines
2.8 KiB
PL/PgSQL
CREATE OR REPLACE FUNCTION highway_is_link(highway TEXT) RETURNS BOOLEAN AS $$
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SELECT highway LIKE '%_link';
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$$ LANGUAGE SQL IMMUTABLE STRICT;
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CREATE OR REPLACE FUNCTION layer_highway(bbox geometry, zoom_level int)
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RETURNS TABLE(osm_id bigint, geometry geometry, class highway_class, subclass text, properties highway_properties) AS $$
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SELECT
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osm_id, geometry,
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to_highway_class(highway) AS class, highway AS subclass,
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to_highway_properties(is_bridge, is_tunnel, is_ford, is_ramp, is_oneway) AS properties
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FROM (
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SELECT
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NULL::bigint AS osm_id, geometry, highway,
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FALSE AS is_bridge, FALSE AS is_tunnel, FALSE AS is_ford, FALSE AS is_ramp, FALSE AS is_oneway,
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0 AS z_order
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FROM ne_10m_global_roads
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WHERE zoom_level BETWEEN 4 AND 7 AND scalerank <= 1 + zoom_level
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UNION ALL
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SELECT osm_id, geometry, highway, is_bridge, is_tunnel, is_ford, is_ramp, is_oneway, z_order
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FROM osm_highway_linestring_gen4
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WHERE zoom_level = 8
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UNION ALL
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SELECT osm_id, geometry, highway, is_bridge, is_tunnel, is_ford, is_ramp, is_oneway, z_order
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FROM osm_highway_linestring_gen3
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WHERE zoom_level = 9
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UNION ALL
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SELECT osm_id, geometry, highway, is_bridge, is_tunnel, is_ford, is_ramp, is_oneway, z_order
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FROM osm_highway_linestring_gen2
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WHERE zoom_level = 10
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UNION ALL
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SELECT osm_id, geometry, highway, is_bridge, is_tunnel, is_ford, is_ramp, is_oneway, z_order
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FROM osm_highway_linestring_gen1
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WHERE zoom_level = 11
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UNION ALL
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SELECT osm_id, geometry, highway, is_bridge, is_tunnel, is_ford, is_ramp, is_oneway, z_order
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FROM osm_highway_linestring
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WHERE zoom_level = 12
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AND to_highway_class(highway) < 'minor_road'::highway_class
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AND NOT highway_is_link(highway)
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AND NOT is_area
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UNION ALL
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SELECT osm_id, geometry, highway, is_bridge, is_tunnel, is_ford, is_ramp, is_oneway, z_order
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FROM osm_highway_linestring
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WHERE zoom_level = 13
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AND to_highway_class(highway) < 'path'::highway_class
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AND NOT is_area
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UNION ALL
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SELECT osm_id, geometry, highway, is_bridge, is_tunnel, is_ford, is_ramp, is_oneway, z_order
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FROM osm_highway_linestring
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WHERE zoom_level >= 14 AND NOT is_area
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UNION ALL
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-- NOTE: We limit the selection of polys because we need to be careful to net get false positives here because
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-- it is possible that closed linestrings appear both as highway linestrings and as polygon
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SELECT osm_id, geometry, highway, FALSE AS is_bridge, FALSE AS is_tunnel, FALSE AS is_ford, FALSE AS is_ramp, FALSE AS is_oneway, z_order
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FROM osm_highway_polygon
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-- We do not want underground pedestrian areas for now
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WHERE zoom_level BETWEEN 13 AND 14 AND is_area AND COALESCE(layer, 0) >= 0
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) AS zoom_levels
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WHERE geometry && bbox
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ORDER BY z_order ASC;
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$$ LANGUAGE SQL IMMUTABLE;
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