[gradsusr] SDF file does not have any non-coordinate variables

[Jennifer Adams]

The variable in the netcdf file is "T" so your variable declaration in  
t.ddf should be
T=>t
instead of
t=>t

--Jennifer



On Feb 8, 2011, at 10:42 AM, Ghan, Steven J wrote:

> I am using Grads version 2.0.a7.1 to open a netcdf file with xdfopen:
>
> ga-> xdfopen t.ddf
> Scanning Descriptor File:  t.ddf
> gadsdf: SDF file does not have any non-coordinate variables.
> SDF Descriptor file t.ddf was not successfully opened & parsed.
>
> Where
> t.ddf =
> dset ^mam3_aerocom2.cam2.h0.0001-0005.avg.nc
> TITLE AeroCom Present Day
> UNDEF 1.e36
> OPTIONS 365_day_calendar
> tdef time 1 linear jan2000 1mo
> VARS 1
> t=>t 30 99
> ENDVARS
>
> According to ncdump,
>
> netcdf mam3_aerocom2.cam2.h0.0001-0005.avg {
> dimensions:
>    lat = 96 ;
>    lon = 144 ;
>    lev = 30 ;
>    time = UNLIMITED ; // (1 currently)
>    double lat(lat) ;
>        lat:long_name = "latitude" ;
>        lat:units = "degrees_north" ;
>    double lon(lon) ;
>        lon:long_name = "longitude" ;
>        lon:units = "degrees_east" ;
>    double lev(lev) ;
>        lev:long_name = "hybrid level at midpoints (1000*(A+B))" ;
>        lev:units = "level" ;
>        lev:positive = "down" ;
>        lev:standard_name =  
> "atmosphere_hybrid_sigma_pressure_coordinate" ;
>        lev:formula_terms = "a: hyam b: hybm p0: P0 ps: PS" ;
>    double time(time) ;
>        time:long_name = "time" ;
>        time:units = "days since 0000-01-01 00:00:00" ;
>        time:calendar = "noleap" ;
>        time:bounds = "time_bnds" ;
>    float T(time, lev, lat, lon) ;
>        T:units = "K" ;
>        T:long_name = "Temperature" ;
>        T:cell_methods = "time: mean" ;
> // global attributes:
>        :Conventions = "CF-1.0" ;
>        :source = "CAM" ;
>        :case = "mam3_aerocom2" ;
> }
> Interestingly, if I remove the
> VARS 1
> t=>t 30 99
> ENDVARS
> from t.ddf, I can open the netcdf file, but query tells me
> ga-> q file
> File 1 : AeroCom Present Day
>  Descriptor: t.ddf
>  Binary: mam3_aerocom2.cam2.h0.0001-0005.avg.nc
>  Type = Gridded
>  Xsize = 144  Ysize = 96  Zsize = 30  Tsize = 1  Esize = 1
>  Number of Variables = 1
>       30  t,z,y,x  Temperature
>
> The variable name is missing! So grads is unable to get the variable  
> name. And of course I have no way of identifying the variable.
>
> The curious thing is that I was not having any such trouble until I  
> produced a new batch of model history.  I compared the ncdumps from  
> the history that I could read with history that I could not, and  
> found only trivial differences unrelated to variable names.
>
> Any suggestions out there regarding this puzzler?
>
> -Steve Ghan
>
> _________________________________
> Steven Ghan, PhD.
> FUNDAMENTAL & COMPUTATIONAL SCIENCES DIRECTORATE
> Atmospheric Sciences and Global Change Division
> Pacific Northwest National Laboratory
> 902 Battelle Boulevard
> P.O. Box 999, MSIN K9-24
> Richland, WA 99352 USA
> Tel: 509-372-6169
> Fax: 509-372-6168
> steve.ghan at pnl.gov
> http://www.pnl.gov/atmospheric/staff/staff_info.asp?staff_num=5663
>
>
>
>
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--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org



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