[geos-devel] Re: [GEOS] #438: ST_Equals(X,X) = false ??

GEOS geos-trac at osgeo.org
Tue May 10 03:56:08 EDT 2011

#438: ST_Equals(X,X) = false ??
 Reporter:  strk        |       Owner:  geos-devel@…              
     Type:  defect      |      Status:  new                       
 Priority:  major       |   Milestone:  3.3.0                     
Component:  Default     |     Version:  svn-trunk                 
 Severity:  Unassigned  |    Keywords:                            

Comment(by robe):

 Is this really a bug?  I would say its invalid.  ST_Equals is supposed to
 return false in this case is my understanding because the boundaries of
 the geometry are not well formed.

 Therefore you can't say it is or isn't spatially equal to itself. Is outer
 space = outer space?  I've always accepted this as a given.  Am I missing

Ticket URL: <http://trac.osgeo.org/geos/ticket/438#comment:2>
GEOS <http://geos.refractions.net/>
GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology Suite (JTS).

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