id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc 2183,ST_SimplifyPreserveTopology does not preserve the topology,pcav,strk,"SELECT ST_ChangeEdgeGeom('province_topo', edge_id, ST_SimplifyPreserveTopology(geom, 500)) topo2-> FROM province_topo.edge; ERROR: Invalid edge (no two distinct vertices exist) whereas: SELECT ST_ChangeEdgeGeom( 'province_topo', edge_id, ST_SimplifyPreserveTopology(geom, 500)) FROM province_topo.edge WHERE ST_IsValid( ST_SimplifyPreserveTopology(geom, 500)); completes the task, but drops all islands. See attached shapefile.",defect,closed,medium,PostGIS GEOS,postgis,2.0.x,fixed,,