[postgis-users] TopologyException: found non-noded intersection

Martin Davis mbdavis at refractions.net
Tue Aug 12 08:55:59 PDT 2008

If you're carrying extra precision in the points of your geometries, you 
could try reducing the precision using snapToGrid.  Sometimes this 
allows union to proceed correctly.


erik wrote:
> Hello,
> "TopologyException: found non-noded intersection."
> I keep getting this on some datasets while doing the st_union. I know 
> some have encountered this before and the suggestion was to find the 
> incriminating geometry and tidy it up. The problem is that I'm 
> batching processing these huge quantities of polygons and am unable to 
> do that.
> Any suggestions on how to find a way around this problem?
> Many thanks,
> Erik.
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Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022

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