08bb2a06c0
Closes #1153 This PR populates the existing `network_type` field in the route table with highway route network information, using the most important value in cases of concurrencies. In order to expose this value, two files `network_type.sql` and `update_route_member.sql` were moved from the `transportation_name` layer to the `transportation` layer. Below is a representative zoom level 6 with motorways only shown for `us-interstate` network types. This sample was generated from this PR using a [custom branch](https://github.com/ZeLonewolf/openstreetmap-americana/tree/selective-highway-zoom) of openstreetmap-americana. This provides a simplified rendering of the highway network which excludes many minor motorway roads and sections.  Below is zoom level 6 on the current [openstreetmap-americana](https://zelonewolf.github.io/openstreetmap-americana/#6/42.148/-73.712). Notice the many additional stubs, motorway islands, and minor routes which are present. Instead of rendering `highway=trunk` to make this network look nice, we can instead suppress non-interstate roads and withhold motorway+trunk rendering to a closer zoom: 
98 lines
3.7 KiB
PL/PgSQL
98 lines
3.7 KiB
PL/PgSQL
CREATE TABLE IF NOT EXISTS ne_10m_admin_0_bg_buffer AS
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SELECT ST_Buffer(geometry, 10000)
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FROM ne_10m_admin_0_countries
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WHERE iso_a2 = 'GB';
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CREATE OR REPLACE VIEW gbr_route_members_view AS
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SELECT 0,
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osm_id,
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substring(ref FROM E'^[AM][0-9AM()]+'),
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CASE WHEN highway = 'motorway' THEN 'omt-gb-motorway' ELSE 'omt-gb-trunk' END
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FROM osm_highway_linestring
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WHERE length(ref) > 0
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AND ST_Intersects(geometry, (SELECT * FROM ne_10m_admin_0_bg_buffer))
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AND highway IN ('motorway', 'trunk')
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;
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-- Create GBR relations (so we can use it in the same way as other relations)
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DELETE
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FROM osm_route_member
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WHERE network IN ('omt-gb-motorway', 'omt-gb-trunk');
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-- etldoc: osm_highway_linestring -> osm_route_member
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INSERT INTO osm_route_member (osm_id, member, ref, network)
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SELECT *
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FROM gbr_route_members_view;
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CREATE OR REPLACE FUNCTION osm_route_member_network_type(network text) RETURNS route_network_type AS
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$$
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SELECT CASE
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WHEN network = 'US:I' THEN 'us-interstate'::route_network_type
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WHEN network = 'US:US' THEN 'us-highway'::route_network_type
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WHEN network LIKE 'US:__' THEN 'us-state'::route_network_type
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-- https://en.wikipedia.org/wiki/Trans-Canada_Highway
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WHEN network LIKE 'CA:transcanada%' THEN 'ca-transcanada'::route_network_type
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WHEN network = 'omt-gb-motorway' THEN 'gb-motorway'::route_network_type
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WHEN network = 'omt-gb-trunk' THEN 'gb-trunk'::route_network_type
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END;
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$$ LANGUAGE sql IMMUTABLE
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PARALLEL SAFE;
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-- etldoc: osm_route_member -> osm_route_member
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-- see http://wiki.openstreetmap.org/wiki/Relation:route#Road_routes
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UPDATE osm_route_member
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SET network_type = osm_route_member_network_type(network)
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WHERE network != ''
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AND network_type IS DISTINCT FROM osm_route_member_network_type(network)
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;
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CREATE OR REPLACE FUNCTION update_osm_route_member() RETURNS void AS
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$$
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BEGIN
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DELETE
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FROM osm_route_member AS r
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USING
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transportation_name.network_changes AS c
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WHERE network IN ('omt-gb-motorway', 'omt-gb-trunk')
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AND r.osm_id = c.osm_id;
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INSERT INTO osm_route_member (osm_id, member, ref, network)
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SELECT r.*
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FROM gbr_route_members_view AS r
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JOIN transportation_name.network_changes AS c ON
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r.osm_id = c.osm_id;
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UPDATE
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osm_route_member AS r
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SET network_type = osm_route_member_network_type(network)
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FROM transportation_name.network_changes AS c
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WHERE network != ''
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AND network_type IS DISTINCT FROM osm_route_member_network_type(network)
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AND r.member = c.osm_id;
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END;
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$$ LANGUAGE plpgsql;
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CREATE INDEX IF NOT EXISTS osm_route_member_network_idx ON osm_route_member ("network");
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CREATE INDEX IF NOT EXISTS osm_route_member_member_idx ON osm_route_member ("member");
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CREATE INDEX IF NOT EXISTS osm_route_member_name_idx ON osm_route_member ("name");
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CREATE INDEX IF NOT EXISTS osm_route_member_ref_idx ON osm_route_member ("ref");
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CREATE INDEX IF NOT EXISTS osm_route_member_network_type_idx ON osm_route_member ("network_type");
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ALTER TABLE osm_route_member ADD COLUMN IF NOT EXISTS concurrency_index int;
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INSERT INTO osm_route_member (id, concurrency_index)
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SELECT
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id,
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ROW_NUMBER() over (PARTITION BY member ORDER BY network_type, network, LENGTH(ref), ref) AS concurrency_index
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FROM osm_route_member
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ON CONFLICT (id) DO UPDATE SET concurrency_index = EXCLUDED.concurrency_index;
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UPDATE osm_highway_linestring hl
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SET network = rm.network_type
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FROM osm_route_member rm
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WHERE hl.osm_id=rm.member AND rm.concurrency_index=1;
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UPDATE osm_highway_linestring_gen_z11 hl
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SET network = rm.network_type
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FROM osm_route_member rm
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WHERE hl.osm_id=rm.member AND rm.concurrency_index=1;
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