[Gvsig_english] ascii raster file

[Hugues Boussard]

2006/4/11, Luis W. Sevilla <sevilla_lui at gva.es>:
>
> Hi Hugues,
>    you're the one with I was talking about adding ArcCrid ASCII support
> though GdalFile, in Rennes, after the conference?


yes I am ...

Hugues Boussard wrote:
>
> > Hello ,
> >
> > I manage to integrate a new reading format for ascii raster file into
> > gvsig. It was quite simple :
> > GeoRasterFile :
> >  supportedExtensions.put("asc",  GdalFile.class);
> >
> > GdalFile :
> >
> > GeoRasterFile.registerExtension("asc", GdalFile.class);
> >
> You don't need to add this one. Only first one it's enough.


ok, it was just to see "RASTER: extension 'asc' supported" in my console...

> then I launched the application into eclipse in order to compile the
> > two classes and then I added the two file.class in the cms.jar whose
> > containing "cresques", and it's works.
> >
> > Indeed, now I launch my application gvsig and it accepts to load the
> > ascii raster file (".asc").
> >
> > but, I can't change the color and especially, when I load a big file
> > (250 Mo), I only have to wait and wait again.
> >
> color change it's a matter of no having yet raster palettes on gvSIG.
> Sometime in the future ...


ok but, how can I change the black color for the nodata-values to white or
transparent color ?

> Maybe, there is a max size for gdal... or for raster...
> >
> Until now I know no specific limits on gdal or raster support. Arcgrid
> must be on memory and then RAM size it's the limit.



ok.

> Do you think I could integrate to gvsig the management of hollow
> > matrix ("matrice creuse" in french) ? it's the fact to set in memory
> > only the important values and not the "nodata-values".
> >
> I think you could try it. It sounds quite interesting to have this kind
> of managemen at least as prototype for evaluating performance and
> advantages.


I think I 'll need your help...

Best regards,

Hugues Boussard,
INRA - Sad Paysage
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