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List: postgis-users
Subject: Re: [postgis-users] Many Funktions does not exist
From: Vinko Vrsalovic <vinko () cprsig ! cl>
Date: 2003-11-21 1:42:12
Message-ID: 20031121014212.GD27059 () landsat ! cprsig ! cl
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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[|-@-|]vinko.cl>
http://www.cprsig.cl
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