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

[PostGIS]

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

 * cc: georgevl (added)


Comment:

 This is also the case for me.

 A set of three (see attached backup from table) geometries, all returning
 true from `isvalid` fail during `st_union` with following message and null
 output:


 {{{

 SELECT ST_Union(__obj) FROM tablesposmerged

 NOTICE:  TopologyException: found non-noded intersection between
 LINESTRING (23.7087 37.9605, 23.7088 37.9606) and LINESTRING (23.7087
 37.9605, 23.7087 37.9605) at 23.7087 37.9605
 }}}

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/1255#comment:2>
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