[Qgis-user] Validate geometries with QGis
borysiasty at aster.pl
Thu Apr 16 06:05:33 EDT 2009
Thursday 16 of April 2009 11:58:00 Carson Farmer napisał(a):
> Hi Felix,
> > Hello,
> > I have a postgis table with large polygons. For some of them postgis'
isvalid function returns false
> > Is there a way to spot these self-intersection places easily?
> One roundabout way to do this would be to use the 'polygons to lines'
> tool in fTools to convert your polygons to lines, then use the
> 'intersect lines' tool (in fTools) to find intersections between the new
> line layer (use the line layer as both input and intersect layer).
> I haven't tested this myself, but in theory in should work...
Unfortunately it doesn't find self-intersections... Such tool would be worth of
its weight in gold anyway :)
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