Hi, I don't understand what is the exact sequence of operations, but I think that performing difference/union operations using layers which are not noded together and floating point coordinates will most likely give micro slivers and micro-holes. It happens, for example, because intersection points are added in resulting geometries, but not in source geometries which is let unmodified. I think that overlay, on the other hand, adds nodes on both layers so that this kind of problem can be avoided.
my 2 cents Michaël Stefan Steiniger a écrit : > Hei, just saw that bug report. > stefan > ======== > > http://sourceforge.net/tracker/?func=detail&aid=2962200&group_id=118054&atid=679906 > > > > > > I've been able to re-create this error in JUMP using the attached files. > Using the Source feature, I difference each of the Difference features > from > it individually. What I'm left with is an almost correct result. There > are very small slivers remaining in the differenced area that > shouldn't be > there. I confirmed this by unioning the Difference features together and > comparing the results. The union result of the Difference features has no > interior rings at or near the sliver areas. (POLYGON > ((-112.50350053191575 41.07440586524802, -112.50350053191733 > 41.07440586524762, -112.503799 41.074331, -112.50350053191575 > 41.07440586524802)) > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > ------------------------------------------------------------------------ > > _______________________________________________ > Jump-pilot-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Jump-pilot-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
