[geos-devel] Postgis 2 and TopologyExceptions

[Martin Davis]

That's a classic JTS/GEOS overlay robustness failure, unfortunately.  
It's caused by the presence of almost-coincident lines.

The usual suggestion is to try reducing precision (snapping to a grid), 
but it looks like maybe you've tried that?  You could try reducing 
precision even more, perhaps.

A more drastic approach would be to perturb every vertex by a small 
random amount.  But there's no guarantee this will help, and it may not 
fit your use case.

On 8/23/2012 5:07 AM, Lars Aksel Opsahl wrote:
> Hi
>
> Chris Hodgson think that this maybe a problem in GEOS or maybe JTS, so I try this mailing list to see if anybody have any ideas.
>
> The problem is explained  at
> http://postgis.refractions.net/pipermail/postgis-users/2012-August/035072.html
>
> Here you also find all the files you need to reproduce the problem,
>
> Regards Lars
>
>
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