[postgis-users] Distance() vs ? - performance

[David Blasby]

Tyler Mitchell wrote:

> 
> I'm doing some basic computing of distance between geometries and I've 
> traditionally used Distance() to give me what I want.  With geos 
> integration is there a different, higher performance option for me to use?
> Suggestions?

no - distance() will be much quicker than using GEOS.

But, the distance() function may give you very slightly wrong answers 
for geometries that are just barely disjoint, just touching, or just 
overlapping.

The geos functions (like relate) will always give you the correct answer.

dave