Silvia,
As far as I know, the GDAL API doesn't have a function to read direct
from a multi-band to 3D matrix.
The GDALRasterBand::RasterIO()[1] and GDALRasterBand::ReadBlock()[2]
reads from one band at the time.
The GDALDataset::RasterIO()[3] does support multi-band reading but I
believe that it will not going to word generically for whatever input
you have and that is usually a import goal when programming with GDAL.
That will depend on the interleave mode and the returning buffer is not
going to be exactly a 3D matrix but it could be interpreted as one with
simple math. I guess.
But that doesn't mean that you cannot use the GDALRasterBand methods and
write your on code to mount a 3D matrix. I don't know about the others
but I feel safer with this approach instead of the GDALDAtaset one.
Anyway, Take a look in some C++ code, that doesn't do multi-band, but a
least can give you one idea of how you can use GDAL in C++ to manipulate
pixel values.[4]
1)http://www.gdal.org/classGDALDataset.html#e077c53268d2272eebed10b891a05743
2)http://www.gdal.org/classGDALRasterBand.html#09e1d83971ddff0b43deffd54ef25eef
3)http://www.gdal.org/classGDALDataset.html#e077c53268d2272eebed10b891a05743
4)http://perrygeo.googlecode.com/svn/trunk/demtools/
Best regards,
Ivan
Silvia Marchesi wrote:
Hi everybody,
I'm a new user of gdal library and functions and I would like to know how
can I read a multiband image putting in a matrix (i.e. A[x][y][b]) the
values of the DN.
Thanks a lot,
Silvia
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