[postgis-users] Units for distance function

Dave Potts dave.potts at pinan.co.uk
Fri Jul 27 00:44:17 PDT 2007

Michael Fuhr wrote:
> On Fri, Jul 27, 2007 at 01:49:28AM +0100, Dave Potts wrote:
>> What units does the distance function use?  am I correct in thinking its 
>> derrived from the srid type of the geometry column?
> Distance/st_distance returns the distance between two geometries
> in whatever units the geometries use (meters, feet, degrees, etc.).
>> So in the case of the British national grid srid 2770  the correct unit 
>> to use is the meter
> I assume you mean SRID 27700, in which case distances would be meters.
Thank You,  its always nice to have a guess confirmed

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