Well I could say that using PostGIS ST_Intersects with "messy data" always seems to give me TopologyExceptions. I've had luck with various combinations of ST_SnapToGrid and ST_Buffer(0), but with messy data there always seems to be some weird case that requires manually edits. Sorry to be the bearer of bad news. Frankly, I don't understand why the GEOS library has to throw that error.
I would encourage you to isolate particular problems and file bug reports. Improvements in GEOS to eliminate the underlying error(s) would certainly be welcome. -- John Abraham > On Feb 8, 2015, at 1:43 PM, BladeOfLight16 <bladeofligh...@gmail.com> wrote: > > On Tue, Feb 3, 2015 at 11:28 AM, BladeOfLight16 <bladeofligh...@gmail.com > <mailto:bladeofligh...@gmail.com>> wrote: > I'm trying to create a polygon overlay. The basic process is relatively > simple: 1) Get the boundaries 2) Union the boundaries to node the linestrings > 3) Polygonize the noded outlines 4) Filter out holes using a contains or > intersects test. The problem I'm running into is that I'm getting > "GEOSUnaryUnion: TopologyException: found non-noded intersection between > LINESTRING" errors from ST_Union. > > [a lot snipped] > > I haven't seen any response to this. I was just wondering if anyone else had > a chance or intentions to look this over. Granted, it's pretty long and > involved (sorry for that), but I thought all the details I included were > important. I do know it went through the mailing list; someone on IRC helped > me find it in the... I guess it's not the archives; I don't know what it's > called. But the online browsing mechanism. Thanks to anyone who's taking a > look. > _______________________________________________ > postgis-users mailing list > postgis-users@lists.osgeo.org > http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
_______________________________________________ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
