[postgis-users] Many Funktions does not exist

[Vinko Vrsalovic]

On Thu, Nov 20, 2003 at 02:16:44PM +0100, Michael Schiller wrote:
> Hello, 
>  
> there are many Funktions that does not exist. 
>   
> There are two Examples: 
>  
>   
> SELECT equals(geom, GeometryFromText('POINT(0 0)', -1)) from test; 
>  
> ERROR:  Function 'equals(geometry, geometry)' does not exist 
>         Unable to identify a function that satisfies the given argument
> types 
>         You may need to add explicit typecasts 
>  
>  
> SELECT IsEmpty(geom) from test; 
>  
> ERROR:  Function 'isempty(geometry)' does not exist 
>         Unable to identify a function that satisfies the given argument
> types 
>         You may need to add explicit typecasts 
>  
>  
> I didn't know why this Funktion's doesn't exist. Other Funktion's how
> Distance, Envelope or Area can i 
> use. 
>  
> I use postgis-0.7.4 

To use those functions you need GEOS, and the latest postgis (cvs
version). You should carefully follow the README.postgis instructions on
how to build PostGIS with GEOS support.

-- 
Vinko Vrsalovic <el[|- at -|]vinko.cl>
http://www.cprsig.cl