[postgis-users] Checking Road Network Topology

[Miller, Stephan]

All -

I am attempting to validate the topology of a dense road network ( 1.2 Million roads) modeled after http://blog.mathieu-leplatre.info/use-postgis-topologies-to-clean-up-road-networks.html from July 2013<http://blog.mathieu-leplatre.info/use-postgis-topologies-to-clean-up-road-networks.html%20from%20July%202013>.  The code is given below:


-- HC_RoadTopologicalCheck
-- Drop the existing topology

SELECT topology.DropTopology('roads_topo');

SELECT topology.CreateTopology('roads_topo',4326, 0.000001, true);

SELECT topology.AddTopoGeometryColumn('roads_topo', 'fgcm', 'transportationgroundcrv', 'topo_shape', 'LINESTRING');
--UPDATE transportationgroundcrv SET topo_shape = topology.toTopoGeom(transportationgroundcrv.shape, 'roads_topo', 1, 1.0);

-- Encapsulate the UPDATE inside code that checks for errors
DO $$ DECLARE r record;
BEGIN
    FOR r IN SELECT * FROM transportationgroundcrv loop
        BEGIN
            UPDATE transportationgroundcrv SET topo_shape = topology.toTopoGeom(transportationgroundcrv.shape, 'roads_topo', 1, 1.0)
            WHERE r.objectid = r.objectid;
        EXCEPTION
                WHEN OTHERS THEN
                RAISE WARNING 'Loading of record % failed: %', r.objectid, SQLERRM;
        END;
    END LOOP;

END$$;

Select * from ValidateTopology('roads_topo');

I am getting everything passing to the exception statement and all the records are being flagged with

WARNING:  Loading of record 791456 failed: SQL/MM Spatial exception - curve not simple

Intermittently, I am getting the following error also.

WARNING:  Loading of record 792591 failed: Spatial exception - geometry intersects edge 69612


Everything appears to be flagged as an error; the ValidateTopology call returns nothing.

Any insights or suggestions would be appreciated.

Steve


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