[postgis-users] Can't make sense of this error

["R. Müller"]

the same for me,

is there any posibility to validate the geometries ?


thanks

ronald

Mark Fenbers wrote:
> I'm consistently getting an error that I cannot make sense of.  Here's 
> the query I run:
> 
> SELECT 'ILN' AS "base radar",radid,
>     npoints(
>             Difference(
>                 base_geom,
>                 x_geom
>             )
>     )
>     FROM MJF WHERE radid != 'ILN';
> 
> Here's the error I get::
> 
> NOTICE:  TopologyException: no outgoing dirEdge found (34380.5,521104)
> ERROR:  GEOS difference() threw an error!
> 
> If I change my WHERE clause such that only one row is returned instead 
> (e.g., unnegate the equality), then I do NOT get the error.  I get the 
> error whether I use Difference(), Intersection(), GeomUnion(), or the 
> like.   The 'base_geom' contains a circular geometry returned from the 
> Buffer() function (to create a disk around point).  The x_geom is a 
> rectangle that I know intersects the circle (base_geom).  Any ideas how 
> to interpret this error?
> 
> Mark
>  
> 
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