[postgis-users] side location conflict in GeomUnion function

[Hisaji Ono]

Hello.

 I've got following error message in creating geometry unions using
postgis-cvs.

# select GeomUnion(the_geom)  from kagawa group by  y2000;

NOTICE:  TopologyException: jpnboundary=# select GeomUnion(the_geom)  from
kagawa where gid <> 883 group by
 y2000;
NOTICE:  TopologyException: side location conflict (133.949,34.2926)
NOTICE:  TopologyException: side location conflict (133.949,34.2926)
ERROR:  GEOS union() threw an error!
ERROR:  GEOS union() threw an error!(133.949,34.2926)
NOTICE:  TopologyException: side location conflict (133.949,34.2926)
ERROR:  GEOS union() threw an error!
ERROR:  GEOS union() threw an error!

 Could you tell me how to detect a record including this geometry which
caused this error and how to remedy this geometry?

 Regards.