Re: Velocity Potential.

Hi Owanda,
I'd take a look at the ATMdaily.2005.nc file driectly by doing a ncdump
-h ATMdaily.2005.nc command. Whenever you get that error message, it
either means that the file that you specified isn't present, or that the
variable you are trying to grab isn't present in the netCDF file.

Based on my limited knowledge of GrADS, I think the variable names
within GrADS are case-insensitive. In other words, within the netCDF
file, the variable might very well be "U", and not "u". People with more
experience with GrADS can correct me if I'm wrong on that. And if it is
"U", and as NCL is case-sensitive, you would switch this: U = data->u,
to this: U = data->U
Hope that helps.
Adam

Owanda Otieno wrote:
> Hi all,
> Can someone please help in identifying the problem with my attached
> script. When I try to run it I get the following error massage;
>
> fatal:Could not create (GHA.2005.nc <http://GHA.2005.nc>)
> fatal:Either file (data) isn't defined or variable (u) is not a variable
> in the file
> fatal:Execute: Error occurred at or near line 36
>
> I am working on bluefire and my data is from RegCM3 runs over the
> region; 12S- 23N, 20E-80E, having the following specifications
>
> Descriptor: ATMdaily.2005.nc <http://ATMdaily.2005.nc>
> Binary: ATMdaily.2005.nc <http://ATMdaily.2005.nc>
> Type = Gridded
> Xsize = 214 Ysize = 134 Zsize = 11 Tsize = 334 Esize = 1
> Number of Variables = 20
> u 11 t,z,y,x Zonal Wind
> v 11 t,z,y,x Meridional Wind
> w 11 t,z,y,x Vertical Velocity
> tk 11 t,z,y,x Temperature
> qd 11 t,z,y,x Mixing Ratio
> qc 11 t,z,y,x Cloud Mixing Ratio
> rh 11 t,z,y,x Relative Humidity
> hgt 11 t,z,y,x Geopotential Height
> th 11 t,z,y,x Potential Temperature
> td 11 t,z,y,x Dew Point Temperature
> vor 11 t,z,y,x Horz Vorticity
> div 11 t,z,y,x Horz Divergence
> mse 11 t,z,y,x Moist Static Energy
> ps 0 t,y,x Surface Pressure
> rt 0 t,y,x Total Precip
> tgrnd 0 t,y,x Ground Temperature
> smt 0 t,y,x Total Soil Water
> bs 0 t,y,x Base Flow
> slp1 0 t,y,x Sea Level Pressure
> slp2 0 t,y,x Sea Level Pressure
>
>
> Thanks in Advance
> Owanda.
>
>
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-- 
--------------------------------------------------------------
Adam Phillips			             asphilli_at_ucar.edu
National Center for Atmospheric Research   tel: (303) 497-1726
ESSL/CGD/CAS                               fax: (303) 497-1333
P.O. Box 3000				
Boulder, CO 80307-3000	  http://www.cgd.ucar.edu/cas/asphilli
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