Sadly the smallest file I have is about 3GB. I will attach a complete
GribRecord as shown by the ToolsUI (which contains the PDS section), maybe it
helps. I still would like to know how I can use the GRIB2-specific classes to
open a dataset. I know I could use the Grib2Iosp, but that won't give me access
to e.g. Grib2Pds.
Regards,
~
PS: You can find the GribRecord here: http://pastebin.com/ktTxiHnn
________________________________
Von: Antonio S. Cofiño [cofinoa@xxxxxxxxx]
Gesendet: Donnerstag, 1. Dezember 2016 17:32
An: Dahn, Nikolas; netcdf-java@xxxxxxxxxxxxxxxx
Betreff: Re: [netcdf-java] Reading GRIB2 levels data
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
_______________________________________________
NOTE: All exchanges posted to Unidata maintained email lists are
recorded in the Unidata inquiry tracking system and made publicly
available through the web. Users who post to any of the lists we
maintain are reminded to remove any personal information that they
do not want to be made public.
netcdf-java mailing list
netcdf-java@xxxxxxxxxxxxxxxx<mailto:netcdf-java@xxxxxxxxxxxxxxxx>
For list information or to unsubscribe, visit:
http://www.unidata.ucar.edu/mailing_lists/
