Frederik Ramm wrote:
Stephan Knauss wrote:
Yes, of course, there are hundreds of thousands of invalid geometries.
For postgis only 11k on the planet are that broken it considers them
invalid.
http://tools.geofabrik.de/osmi/debug.html?view=multipolygon&lon=7.86328&lat=49.49239&zoom=5&overlays=invalid_geometry_hull,duplicate_ways,intersections,intersection_lines,ring_not_closed_hull,ring_not_closed,unconnected_end_nodes,touching_inner_rings_hull,touching_inner_rings,role_mismatch_hull,role_mismatch,duplicate_tags_hull,duplicate_tags,multipolygons_type_is_boundary,type_is_boundary,ways,role_markers,way_end_nodes,way_nodes
Great tool. I did not know it can also check Multipolygons. Thank you
for providing this. A big help is it showing the actual intersection
point causing the problem.
The API doesn't (and can't) prevent them, and osm2pgsql makes no efforts
(and couldn't really) correct them.
So it's best to prepend every whery that relies on valid geometries with
"AND ST_IsValid(way)"
Stephan
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