Hi, reading the suggested SQL to generate the simplified edges geoms I thinkg a minor change would provide more robust resolults:
Phase 3: >select ST_Collect(st_simplifyPreserveTopology(geom, 10000)) as geom should be canged to: >select ST_SimplifyPreserveTopology(ST_Collect(geom), 10000)) as geom this guarantees that topology is preserved between edge_data geometries. This solved various issues I obtained while applying the original SQL to some intricated geometries. If you agree on this I can modify the wiki page directly. All the best, giovanni
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