That's exactly right, Michael. Also see D7 in the FAQ here: http://tsusiatsoftware.net/jts/jts-faq/jts-faq.html
Michaël Michaud wrote: > 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 > > -- Martin Davis Senior Technical Architect Refractions Research, Inc. (250) 383-3022 ------------------------------------------------------------------------------ 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
