[gradsusr] Open netcdf file with rotated spherical grid mapped to a NPS projection

[Oriol Ciurana]

Hello,

I'm trying to open with GrADS a netcdf file from Marine Copernicus (CMEMS)
with no luck. The product is described in
http://cmems-resources.cls.fr/documents/PUM/CMEMS-ARC-PUM-002-006.pdf and
as you can see at the top of page 8, the grid is a rotated spherical grid
mapped to a NPS projection.

I have read in http://cola.gmu.edu/grads/gadoc/pdef.html that a descriptor
file with a defined PDEF is needed, but I don't know how to define this
descriptor file and, in particular, the parameters of PDEF.

Could anyone help me, please?

An example file is available here (CMEMS login/password required, free
registration):
ftp://mftp.cmems.met.no/Core/ARCTIC_ANALYSIS_FORECAST_WAV_002_006/dataset-mywave-arctic-be/20170831_MyWaveWam8_b20170830.nc

Thanks in advance,

Oriol Ciurana
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