[postgis-users] problem with intersection

[Markus Schaber]

Hi, Olivier,

olivier dorie schrieb:

> I'm using PostgreSQL 7.4.6 with Postgis 0.9.0 and geos 2.1.0.
>  
> When I intersect the 2 following polygons, the answer is an exception :
> =================================================================================================
> select intersection('POLYGON((588912.7 2432104.5,588927.7 2432124,
> 588928.9 2432123.6, 588923.7 2432132.3,588912.7
> 2432104.5))','POLYGON((588916.4 2432124.4, 588920.7 2432129.9,588928.6
> 2432123.7,588930.1 2432122.6,588916.4 2432124.4))');
> NOTICE:  TopologyException: no outgoing dirEdge found (588929,2.43212e+06)
> ERREUR:  GEOS Intersection() threw an error!
> =================================================================================================
> I think the polygons are valid. is there a problem with the intersection
> or in my installation ?

Hmm, isvalid() returns true for both polygons in my installation, and I
get the same error on intersection, so I think you possibly found a bug.

Markus
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