[FWTools] HDF5 Complex Dataset porting in GEOTIFF

andyNEXT andrea.pistoni at next.it
Mon Feb 4 05:29:28 EST 2008

Hi Frank!

The Complex Dataset is only one of the quetion I have to resolve about HDF5. 

I'm working on COSMO-SKYMED H5 files and I have other problems such as the
correct north orientation of the images that is more serious than first.

Using Gdal, the GeoTiff file from H5 (with normal dataset [MxN]) is not
correctly georeferenced because the COSMO images are stored in the H5 file
depending on the flight direction of the satellite [Right Ascending, Left
Ascending, Right Descending, Left Descending] and this information [Look
side and Orbital Direction] are not considered from the Gdal library during
the creation of the Geotiff.

I'm thinking to develop a dedicated driver only for COSMO but I'm not able
to estimate the time I have to spent in order to realize it. The Project
Mileston is the end of February.....

I've already used the HDF5 library (Java) some time ago in another project 
but I didn't need to convert the Dataset in Geotiff such now. At the moment,
I don't know how to integrate my experiences about HDF5 in the GDAL
environment in order to resolve my task problem.

What do you think about? Do I need really to make a new COSMO H5 driver to
add in GDAL? Or is it better to integrate in my SW Project the HDF5 Group
Library with the GDAL?


Andrea Pistoni

Frank Warmerdam-2 wrote:
> andyNEXT wrote:
>> Hi All, 
>> I've to create a GTiff file from an HDF5 Complex Dataset that is a MxNx2
>> matrix. The problem is that the gdal moethod Open() reads this Dataset
>> not
>> such as 2 Datasets of dimensions [MxN], but such as M datasets of
>> dimensions
>> [Nx2]. My intention is to create 2 Geotiff file of dimensions [MxN].
>> Does somebody know a method of gdal library to set custom Dataset band
>> selection?
> Andrea,
> You might have better luck reaching the folks knowledgable about the HDF5
> driver on the gdal-dev list.  There is no way for the user/application to
> control how the HDF5 driver guesses which dimensions are x, y and bands.
> But if you can provide a pointer to the dataset I might be able to tweak
> the logic a bit.
> 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    | President OSGeo, http://osgeo.org
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