52 lines
2.4 KiB
SQL
Executable File
52 lines
2.4 KiB
SQL
Executable File
-------------------------------------------------------------------------------
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-- The following script creates a new table for the pgsql simple schema for
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-- storing full way geometries.
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--
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-- Author: Ralf
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-------------------------------------------------------------------------------
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-- drop table if it exists
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DROP TABLE IF EXISTS way_geometry;
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-- create table
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CREATE TABLE way_geometry(
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way_id bigint NOT NULL
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);
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-- add PostGIS geometry column
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SELECT AddGeometryColumn('', 'way_geometry', 'geom', 4326, 'GEOMETRY', 2);
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-------------------------------------------------------------------------------
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-- the following might go into the POST_LOAD_SQL-array in the class "PostgreSqlWriter"??
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-------------------------------------------------------------------------------
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-- add a linestring for every way (create a polyline)
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INSERT INTO way_geometry select id, ( select ST_LineFromMultiPoint( Collect(nodes.geom) ) from nodes
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left join way_nodes on nodes.id=way_nodes.node_id where way_nodes.way_id=ways.id ) FROM ways;
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-- after creating a line for every way (polyline), we want closed ways to be stored as polygones.
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-- So we need to delete the previously created polylines for these ways first.
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DELETE FROM way_geometry WHERE way_id IN
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( SELECT ways.id FROM ways
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WHERE ST_IsClosed( (SELECT ST_LineFromMultiPoint( Collect(n.geom) ) FROM nodes n LEFT JOIN way_nodes wn ON n.id=wn.node_id WHERE ways.id=wn.way_id) )
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AND ST_NumPoints( (SELECT ST_LineFromMultiPoint( Collect(n.geom) ) FROM nodes n LEFT JOIN way_nodes wn ON n.id=wn.node_id WHERE ways.id=wn.way_id) ) >= 3
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)
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;
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-- now we need to add the polyline geometry for every closed way
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INSERT INTO way_geometry SELECT ways.id,
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( SELECT ST_MakePolygon( ST_LineFromMultiPoint(Collect(nodes.geom)) ) FROM nodes
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LEFT JOIN way_nodes ON nodes.id=way_nodes.node_id WHERE way_nodes.way_id=ways.id
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)
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FROM ways
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WHERE ST_IsClosed( (SELECT ST_LineFromMultiPoint( Collect(n.geom) ) FROM nodes n LEFT JOIN way_nodes wn ON n.id=wn.node_id WHERE ways.id=wn.way_id) )
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AND ST_NumPoints( (SELECT ST_LineFromMultiPoint( Collect(n.geom) ) FROM nodes n LEFT JOIN way_nodes wn ON n.id=wn.node_id WHERE ways.id=wn.way_id) ) >= 3
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;
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-------------------------------------------------------------------------------
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-- create index on way_geometry
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CREATE INDEX idx_way_geometry_way_id ON way_geometry USING btree (way_id);
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CREATE INDEX idx_way_geometry_geom ON way_geometry USING gist (geom);
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