As Dave has said, yes, you do need to upgrade to postgis w/geos in order to 
determine if two geometries actually intersect each other.

Something that may be of interest is that the "truly_inside()" function, while 
suffering from an unfortunately confusing name, is slightly more useful than 
the simple "&&" bounding-box intersection operator. "truly_inside" tests 
whether one geometry operand is actually (truly) inside the other's bounding 
box. It is possible for two geometries to have bounding boxes that overlap, 
even though neither of the actual geometries intersect each other's bounding 
box - imagine two circle-like polygons, whose bounding boxes intersect at one 
corner. This function allows you to differentiate these cases from the more 
general bounding-box overlap.

Just a little note, as "truly_inside()" is commonly misunderstood. 

Chris

Quoting Vinko Vrsalovic <vinko@cprsig.cl>:

> Hi,
> 
> 	Is there a way to test if a certain feature is within a polygon
> 	and not the bounding box of it with truly_inside and the like?
> 
> 	Or I need to upgrade to the CVS version to use the GEOS
> 	contains() or within() functions?
> 
> Thanks,
> --
> Vinko Vrsalovic <el[|-@-|]vinko.cl>
> http://www.cprsig.cl
> 
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> 





