[mapserver-dev] [mapserver-users] msOGRFileNextShape(): OGR error. TopologyException: side location conflict

[Even Rouault]

Le mercredi 25 février 2015 18:03:00, yeryry a écrit :
> I sent this to the users list a couple of weeks ago, as it was related
> to an old discussion there... But it's really a bug of some kind, so
> here is perhaps a better place.
> 
> I ran into this old problem today, using the OSGeo4W daily 6.5 build.
> http://lists.osgeo.org/pipermail/mapserver-users/2009-August/thread.html#62
> 527 http://trac.osgeo.org/mapserver/ticket/3100
> Google finds quite a lot of non-mapserver-related questions about this
> error, but perhaps (as was suggested in the ticket), something can be
> done to avoid it, as it is related to GEOS
> (EdgeEndStar::propagateSideLabels). Mapserver seems to render the
> problematic geometry with no problem, but fails when a query (WMS
> GetFeatureInfo) falls near it. I think it can't be related to input
> file format, as it does the same with KML, spatialite, and GML. I have
> made a simple set of data that shows the problem, but I'm not sure
> what parts I should post, as altogether it's quite long.

You could test if you can reproduce the error with ogrinfo -spat on the 
dataset with a bounding box close to the one provided to GetFeatureInfo. 
As noted in the ticket this error probably comes from a topologically 
incorrect shape.


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