[gdal-dev] geometry overlap

[Even Rouault]

Selon Neelima Emmani <neelima.emmani at iictechnologies.com>:

> Hi All,
> I am trying to check, if there is an overlap between two area
> featuretypes.Ex: LNDARE and OBSTRN. Actually in my dataset I have an overlap
> but my code pasted below is returning false value for overlap. Can anyone
> help me out. Here we are trying to code with C#.
>
>  while  ((featLNDARE = layerLNDARE.GetNextFeature()) != null)
>            {
>                geomLNDARE = featLNDARE.GetGeometryRef();
>  while ((featOBSTRN = layerOBSTRN.GetNextFeature()) != null)
>                {
>  geomOBSTRN = featOBSTRN.GetGeometryRef();
>
> bool checkforoverlap=sub_geomLNDARE.Overlaps(sub_geomOBSTRN);
> }
> }

Are you sure that Overlaps() is the right spatial primitive you want to use ?
Perhaps it should be Intersects(). If it is Overlaps(), as A.Overlaps(B) is not
equivalent to B.Overlaps(A), perhaps you could try inverting the object and the
argument.