Nikolas,
do you have a sample file that you can share?
Regards
Antonio
On 01/12/16 16:02, Dahn, Nikolas wrote:
Hello!
I'm writing a program to import GRIB2 files into our data store. As it
turns out, GRIB(2) is strange. As described here (see 150+notes)
<http://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_table4-5.shtml>
GRIB2 variables may have a "Generalized Vertical Height Coordinate"
*which is not part of the coordinate system* but described through an
external "3D-GRIB message". Sadly I have exactly that case.
Until now I have not found a way to access this data through the usual
netCDF Java interface. I open the grib2 file as a GridDataset, but as
the level is not part of the variable's coordinates definition it
doesn't appear as an axis of the GridCoordSystems. Reading the data
from the value variable only imports the topmost layer (40-41 in this
case). As seen in this screenshot <http://imgur.com/a/kMnIy> the
ToolsUI tool can access it, but only from the GRIB2 view. The levels
neither appear in the NcML dump nor as a (dimension-)variable. They
seem to be part of the GRIB2 PDS section.
My question is: is there a way to access this additional level data
through the common interface? And if not, how can I access the PDS
sections? I am not sure how to open a GRIB2 file with the specialized
GRIB2 classes. I am using NetCDF-4.6.6.
Thanks in advance!
Nikolas
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