SDF: Fractional months ?

[Don Hooper]

Dan,

What are the first two values of the t vector in the NetCDF file?
GrADS is complaining because it thinks the difference between them
is less than 1.0.  If this is monthly data, with values like 1.0, 2.0,
3.0, etc., as you suggest, that shouldn't happen.

-Hoop
> From owner-gradsusr at LIST.CINECA.IT  Fri Apr 21 14:50:45 2006
> From: "dan.swank" <Dan.Swank at NOAA.GOV>
>
> Grads users:
>
> I am creating a NetCDF file for a project demo.
> my CDL time definition is:
>
>         int t(t) ;
>                 t:long_name = "analysis time" ;
>                 t:units = "month since 2004-03-01" ;
>                 t:GRIB_orgReferenceTime = "2004-03-01T00:00:00Z" ;
>                 t:_CoordinateAxisType = "Time" ;
>
> The data is 25 months of month-averaged GFS winds.
> Which would in grads language be equivalent to:
> tdef 25 linear 00z01mar2004 1mo
>
> ncgen created the file no problem.  But grads don't like it:
> "SDF:  Fractional months are ill-defined and not supported by GrADS"
>
> Anyone know a quick reason?  Is this cdl time def. somehow not COORDS
> complient?  What definition would work?
>
> -Dan