Ugh. Larry, I think your approach is probably what's necessary. I would suggest NOT trying to do a JTS contains() to implement the "wholly inside" test - it would be very slow (although the new PreparedGeometry work would make it a lot faster - but it would still be slow).
You might consider just check say 3 points of the ring to see if they are wholly inside - if so, assume it is a hole. That should be a lot faster. Larry Becker wrote: > I've found a shapefile that has what JTS thinks is a topology error of > "overlapping shells". In ESRI ArcMap it displays correctly as a shell > polygon with a hole, but in JUMP, it displays as overlapping > polygons. It fails the QA "Basic Topology" test. I have verified > that the "hole" polygon is not CCW (counter clockwise) and this is > being interpreted as a shell by the org.geotools.PolygonHandler. > > It looks like another case where ESRI isn't following their own > specifications. Any suggestions? I don't like to "fix" customer's > data when it works fine in their ESRI system. > > I'm considering modifying the PolygonHandler code to test all of the > polygons in a multipolygon shape to determine if they are completely > inside, and then reversing the point order to force CCW. This might > make shapefiles read slightly slower. > > regards, > > Larry Becker > > -- > http://amusingprogrammer.blogspot.com/ > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > ------------------------------------------------------------------------ > > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > -- Martin Davis Senior Technical Architect Refractions Research, Inc. (250) 383-3022 ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
