[postgis-users] problem with intersection

[olivier dorie]

Hi list,

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 ?

grettings,

Olivier .

PS : 
if I translate the polygons before, it works :
==================================================================================================
select intersection('POLYGON((588912.7 104.5,588927.7 124, 588928.9 123.6, 588923.7 132.3,588912.7 104.5))','POLYGON((588916.4 124.4, 588920.7 129.9,588928.6 123.7,588930.1 122.6,588916.4 124.4))');
                                                                              intersection                                                             
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 SRID=-1;POLYGON((588928.6 123.700000000017,588927.7 124,588926.942223355 123.014890362064,588920.367823092 123.878680177714,588922.264519491 128.672149259957,588928.6 123.700000000017))
(1 ligne)
===================================================================================================


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