[postgis-users] ST_Within and GEOMETRYCOLLECTION

[Martin Davis]

It's because the underlying JTS/GEOS operation doesn't support 
GeometryCollections.  And this in turn is because of the details of the 
implementation - in particular, handling the situation where two 
polygons overlap.  It would require computing the overlay of the 
polygons in order to detect the within condition at the point of overlap.

On 5/7/2012 7:52 AM, Hemin Tofiq wrote:
> Hi,
> The documentation about ST_Within says:	
> "Do not call with a GEOMETRYCOLLECTION as an argument", without saying why.
> I can not finde more Info about taht, du anyone has an explanation?
>
> http://postgis.refractions.net/docs/ST_Within.html
>
> Thanks in advance,
> Hemin
>
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