Hi all,
I would like to know how one would specify a "pft" dimensionless
coordinate in order to be CF-compliant and supported by most software.
Here is an example which uses the "pft" dimension variable, with
axis='E' (for ensemble):
double pft(pft) ;
pft:long_name = "plant functional type" ;
pft:units = "none" ;
pft:axis = "E" ;
double npp(time, pft, latitude, longitude) ;
npp:long_name = "npp of carbon for each pft" ;
npp:units = "kg m-2 year-1" ;
npp:_FillValue = 8.99999982852418e+20 ;
GRADS accepts it, but cdo replaces the axis='E' with axis='Z',
presumably because it is not a CF/COARDS standard.
axis='Z' represents a vertical coordinate, and is supported by most
software. However, it does not fully represents the concept of pft
(because it is not formally a vertical axis).
thanks,
Etienne
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