Hi Larry, I get a case somewhat similar with a parser I wrote for GeoConcept format. In this format, multi-polygon come as a set of linear rings with no special order and eventually some overlaps or other bad topology I wanted to catch. I decided to compute the DE-9IM matrix in a double loop Something like List<Polygon> input = ... // the list of polygons issued from my linear rings List<Polygon> result = ... // an empty list of polygons for (Polygon pi : input) for (Polygon pr : result) IntersectionMatrix im = pi.relate(pr) // then decide if pi is a new polygon, a hole in an existing polygon (result), an overlapping polygon...
I must admit this approach may have an unecessary performance penalty for a format like shapefile (in my case, correctness was more important than performance) Michaël ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel