[gdal-dev] using GDALCreateCopy and changing only the datatype

[Yann Chemin]

Yes I can see a bit through it,
and I believe the most involved is getting Projection info through...

For a single output band with ncols(nXSize1) and nrows (nYSize1) in
Float32, I can generate an output.
hDataset[n_imgs] =
GDALCreate(hDriver[0],out,nXSize1,nYSize1,1,GDT_Float32,NULL);
But it is not georeferenced.

need a bit of reading indeed.
Thanks,
Yann


2008/11/25 Frank Warmerdam <warmerdam at pobox.com>:
> Yann Chemin wrote:
>>
>> Hello,
>>
>> I would like to use GDALCreateCopy and change the datatype from int32
>> to float32.
>>
>>        GDALDatasetH hDatasetOut0;
>>        hDatasetOut0 = GDALCreateCopy( hDriver1, ndviF,
>>                                hDataset1,FALSE,NULL,NULL,NULL);
>>        GDALRasterBandH hBandOut0;
>>        hBandOut0 = GDALGetRasterBand(hDatasetOut0,1);
>
> Yann,
>
> Generally speaking to do this with CreateCopy() you would need to create
> an intermediate virtual dataset with the altered pixel data type.  This is
> how the -ot flag of gdal_translate works.   You can review the
> gdal_translate.cpp code as an example, though it is somewhat involved.
>
> Best regards,
> --
> ---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank Warmerdam,
> warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial Programmer for Rent
>
>



-- 
Yann Chemin
International Rice Research Institute
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