[postgis-users] Problems using buffer() and operador &&

[strk at refractions.net]

Gustavo, the LSEG type has nothing to do with postgis.
Postgis defines its own datatype, which is GEOMETRY.
There are currently no casts between postgresql geometric types
and postgis geometry type.

--strk;

On Thu, Oct 28, 2004 at 12:38:18PM -0200, Gustavo Oliveira wrote:
> I have a problem when trying to use && operator with buffer().
> 
> I tried something like this:
> 
> ae=# SELECT arco
> ae-# FROM vw_arcos
> ae-# WHERE BUFFER (GeometryFromText('LINESTRING(200509.7414
> 7564876.6272,201884.7341 7563144.9198)', -1), CAST (1000.01 as double
> precision)) && caminho;
> ERROR:  operator does not exist: geometry && lseg
> HINT:  No operator matches the given name and argument type(s). You may need
> to add explicit type casts.
> 
> and like this one:
> 
> ae=# SELECT arco
> ae-# FROM vw_arcos
> ae-# WHERE BUFFER (GeometryFromText('LINESTRING(200509.7414
> 7564876.6272,201884.7341 7563144.9198)', -1), CAST (1000.01 as double
> precision)) && caminho::geometry;
> ERROR:  cannot cast type lseg to geometry
> 
> I tried the same statements with ~ operator but the errors are the same.
> 
> Caminho is a lseg type as you can see:
> 
>  arco | sentido |   custo   |                         caminho
> ------+---------+-----------+-----------------------------------------------
> ----------
>     1 |       0 |   81.2678 |
> [(201781.9537,7565503.6469),(201758.1738,7565425.9361)]
>     2 |       0 |   26.8538 |
> [(201758.1738,7565425.9361),(201769.1282,7565401.4182)]
>     4 |       0 |   109.652 |
> [(198967.4184,7561052.1535),(199047.7745,7561126.7623)]
>     5 |       0 |   20.5885 |
> [(199047.7745,7561126.7623),(199033.7658,7561141.8501)]
>    23 |       2 |   98.9721 |
> [(201014.4548,7561980.7571),(201078.5089,7561905.3081)]
> 
> 
> Could someone help me?
> 
> []s
> 
> ---
> Gustavo Borges de Oliveira
> PIPE - FAPESP
> 3WT - Wireless Web World Tech
> gustavo.oliveira at 3WT.com.br
> tel: +55 16 3371-4343
> fax: +55 16 3371-9847
> 
> 
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