Hi all, I have only recently started using GEOS and have been running into some trouble with above error. I could not find any previous thread discussing that, though I would imaging I am not the only one having these problems, unless I am missing something obvious.
I have two polygons (see attached image):
POLYGON ((0.2211951454783701 0.6116363364138385, 0.2116652521705010
0.3057918334745276, 0.0000000000000000 0.3342081624528198, 0.0000000000000000
0.6021205790472257, 0.2211951454783701 0.6116363364138385))
POLYGON ((0.1934378019924705 0.5543894053042878, 0.0346403069293590
0.6036107960008207, 0.1570826679798040 0.8240949853554586, 0.2381873983140706
0.7858234220006816, 0.2540331812845585 0.6772047940497147, 0.2586049375279220
0.6319069804375443, 0.2411233583092139 0.5940152906469550, 0.1934378019924705
0.5543894053042878))
and I am getting the following exception when I try to compute their
intersection:
TopologyException: found non-noded intersection between
0 0.602121, 0.0346403 0.603611
and 0.193438 0.554389, 0.0346403 0.603611 0.0346403 0.603611
Now, I suspect it has something to do with rounding and that the left-most
vertex of the smaller polygon lies directly on the bottom edge of the layer
polygon.
My questions are: Why is this a problem? How can I avoid this exception?
Any help is appreciated. I am using GEOS 3.0.0rc4.
Cheers,
Oliver
--
Oliver Baltzer
Faculty of Computer Science
Dalhousie University
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