[postgis-users] RE: ST_Difference Perplexes Me!

[Martin Davis]

Snaptogrid might help, since it perturbs the geometries a bit, which can 
sometimes sidestep these kinds of errors.

You should also ensure that your input geometries are valid.

Dylan Lorimer wrote:
> Hi Regina,
>
> Getting Geos errors...any ideas? I'm using the latest PostGIS build 
> (1.3.3) and all very recent Geos and such. Any ideas on how to get 
> around this? Would I use snaptogrid?
>
> NOTICE:  TopologyException: found non-noded intersection between 
> 91.9895 27.8807, 91.9179 27.7568 and 91.9908 27.4679, 91.9883 28.2494 
> 91.9895 27.8807ERROR:  GEOS difference() threw an error!
>
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-- 
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022