[postgis-users] ST_Within and GEOMETRYCOLLECTION

[Paul Ramsey]

On Mon, May 7, 2012 at 4:41 PM, Martin Davis <mtnclimb at telus.net> wrote:
> 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.

Why so? If you're in one component, does that end the test? The answer
is 'true'.
P.

>
>
> 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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