[postgis-users] RV: Distance Function

[Mark Cave-Ayland]

> -----Original Message-----
> From: postgis-users-bounces at postgis.refractions.net 
> [mailto:postgis-users-bounces at postgis.refractions.net] On 
> Behalf Of Nicolas RIBOT
> Sent: 18 August 2004 09:24
> To: PostGIS Users Discussion
> Subject: RE: [postgis-users] RV: Distance Function
> 
> 
> Hello Brigitte,
>  
> I think that the distance function works only on cartesian 
> coordinates. For geographic coordinates, the best way is to 
> reproject them in a projected coordinate system and then to 
> measure the distance.
>  
> Nicolas 


Hi Brigitte,

You should also be able to calculate the difference between two points
using the distance_spheroid() function (see
http://postgis.refractions.net/docs/x956.html for more information).


Kind regards,

Mark.

---

Mark Cave-Ayland
Webbased Ltd.
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