Hi Jukka, Thanks for the links, I will take a look.
I've done some performance testing and all three (ST_Buffer, ST_SnapToGrid, ST_Distance "minimax") solutions incur a significant performance penalty with the massive amount of data that OWL needs to process, i.e.: Without this heuristic I get 20-25k changesets / hour. With this heuristic I get 5-10k changesets / hour (depending on the implementation). Right now I employ a simple bounding box + linestring length heuristic which has pretty much no performance penalty and work for > 99% of cases. I still need to find some good test cases to check if I don't omit some important changes but for now it works. Paweł _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
