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.
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