[postgis-users] Polygons: the unstable foundation of spatial modeling
dblasby at refractions.net
Thu Mar 25 09:18:18 PST 2004
bartvde at xs4all.nl wrote:
> Hi list,
> the following article dating from October 2003 deals with a comparison of
> polygon definitions (and especially the boundary between valid and
> invalid) in several Spatial DBMS's, and also PostGIS 0.6.2.
> Any comments on this? I can imagine a lot has changed since version 0.6.2
> regarding this subject?
You should run the isvalid(<geometry>) function on the polygons. You'll
find its 100% OGC compliant, except it allows for repeated points on the
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