[postgis-users] Re: Difference throws an error
mbdavis at refractions.net
Tue Nov 7 14:29:00 PST 2006
The reason the error is thrown is that at least one of the geometries
has a very gnarly spike on one side of it. The second geometry contains
[ 0:28] POINT (5417154.92 5658376.37)
[ 0:29] POINT (5417155.18955743 5658376.89699992)
[ 0:30] POINT (5417154.919 5658376.371)
[ 0:31] POINT (5417155.814 5658378.111)
These form a spike/gore where the inside vertex 29 is almost coincident
with the edge 30-31.
This geometry combination causes an error in all previous versions of
JTS/GEOS as well. Hopefully this problem can be addressed with some
further work on robustness.
Senior Technical Architect
Refractions Research, Inc.
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