[postgis-devel] [PostGIS] #1255: ST_Union Returns NULL on valid geometries

PostGIS trac at osgeo.org
Fri Oct 28 12:02:14 PDT 2011

#1255: ST_Union Returns NULL on valid geometries
 Reporter:  glock    |       Owner:  pramsey      
     Type:  defect   |      Status:  new          
 Priority:  medium   |   Milestone:  PostGIS 2.0.0
Component:  postgis  |     Version:  1.5.X        
 Keywords:           |  

Comment(by pramsey):

 Well, I don't get NULL, I get
 ERROR:  GEOSUnionCascaded: TopologyException: Directed Edge visited twice
 during ring-building at 0.276593 0.861539
 against GEOS 3.2.3. So there's something we can't handle, but we shouldn't
 be returning NULL.

Ticket URL: <http://trac.osgeo.org/postgis/ticket/1255#comment:1>
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