[geos-devel] strange behaviour of LinearRing::within()

[Marco Hugentobler]

On Tuesday 12 June 2007 23:14:11 Martin Davis wrote:
> Marco,
>
> I suspect this is because you are expecting linear rings to "contains"
> the area they enclose. But this is not how linear rings are defined -
> they are 1-dimensional features, not areal ones.  A linear ring would
> only be "within" another one if its linework lay exactly on top of the
> other one's linework.   GEOS is behaving correctly, according to the SFS
> geometry model.

Hi Martin,

Ok, I see. Thanks for clarification.

Marco

-- 
Dr. Marco Hugentobler
Institute of Cartography
ETH Zurich
marco.hugentobler at karto.baug.ethz.ch