[gdal-dev] parsing of netcdf4 no-data values in hdf5 reader

[Even Rouault]

On mercredi 10 octobre 2018 17:28:59 CEST Bekaert, David (334H) wrote:
> Dear GDAL developers,
> 
> I generated a netcdf4 file using python netCDF4 module.
> As indicated in the documentation, GDAL opens this file with the HDF5 reader
> without problem.
 I am also able to properly display the geocoded file with
> QGIS (no-data not applied) and panoply (no-data applied). 
> From reading through the code I believe the GDAL hdf5 reader does not parse
> a “no-data” attribute of the dataset.
 For the GDAL netcdf reader I found
> this is being tracked among other attributes. Do you have any advice on
> what I need to do for GDAL to capture e.g. “missing_value” , “_FillValue”
> or even a “nodata” attribute from the netcdf4 datasets using the hdf5
> reader? 

My main question would be: why not to use the netCDF driver ? It is supposed 
to deal with that already.

Otherwise I guess you could use the GH5_FetchAttribute() convenience function 
to retrieve those attributes and expose them as nodata in the HDF5 driver.

Even

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