[Gvsig_italian] Problemi con file MrSID

[Luis W. Sevilla]

Hi list, sorry not to write in Italian, but it's not possible to me :-(

Antonio Falciano wrote:

>Enzo Viti ha scritto:
>  
>
>>Facendo altre verifiche ho notato che quando il file .sid contiene al suo
>>interno le informazioni di georeferanziazione, l'immagine viene posizionata
>>correttamente. Sembra quindi che il problema sia riferito solo alla mancata
>>lettura del file esterno.
>>    
>>
>
>Questo perchè i .sid possono comportarsi come i geoTIFF. Leggo ora sulla
>ml internazionale che, di fatto, i .sdw non sono considerati da gvSIG.
>Verrebbe da dire... why not? ;)
>  
>
I think there's a misunderstanding here. In geotiff the georeferencing
info is internal, and in tiff (without geo tags) the georeferencing info
it's external (.tfw). gvSIG it's using gdal for opening tiffs, and I
believe that if  you have a geotiff with a georeferencing info all 0,
and a .tfw with the right geoinfo, you'll get the same behavior than the
one you're getting with .sid file format.

The key point here its: if the files are geospatial ones (geotiff and
MrSID), gvSIG will use the internal information. If they are no
geospatial ones (standard tiff and jpeg, by instance) gvSIG will use
external world files as this is the only way to georeferencing them

I hope it helps, and please, Antonio or anyone, translate my response to
italian if you thins it's usefiull
 Ciao
    Luis

>Ciao
>Antonio
>
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-- 
  Luis W. Sevilla Muelas
  Director Técnico proyecto gvSIG/gvSIG project Technical Manager
  Conselleria de Infraestructures i Transport
  Generalitat Valenciana
  Valencia - Spain
  http://www.gvsig.gva.es
  tno: +34 9638 69 674