[postgis-users] Units for distance function

[Dave Potts]

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

Dave.
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