[geos-devel] MULTI* and Invalid

[Oliver Courtin]

Hi,


Below an example, throught PostGIS 
with GEOS 3.3.5-CAPI-1.7.5:


SELECT ST_IsValidReason(
  'MULTIPOLYGON(((0 0,1 0,1 1,0 1,0 0)),((1 0,2 0,2 1,1 1,1 0)))'::geometry
  );


Output:   Self-intersection[1 0]


After looking in SFS and ISO 19107, 
we didn't find at first sight 
why such a geometry should be invalid.


Could you give us some light on it ?


Thanks in advance,


--
Olivier

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