Using traj.gs

[James T. Potemra]

Jason:

The script requires that you first display a variable (it uses the GrADS 
query function to get plot dimensions).  If you don't want to actually 
display something "under" your trajectory, you can "set cmin" to 
something larger than U and/or V, then display U and/or V, then run traj.gs

Jim

Jason Snyder wrote:
> I am trying to open up two files one with a zonal wind componant and 
> the other with the meridional wind componant to use to make a 
> trajectory via traj.gs <http://traj.gs> script.
>  
> Here is the .ctl file for the zonal wind:
>  
> DSET uwndavg2001.nc <http://uwndavg2001.nc>
> OPTIONS template
> DTYPE netcdf
> XDEF longitude 144 linear 0.0 2.5
> YDEF latitude 73 linear -90 2.5
> TDEF time 1 linear 0z1Jan2001 1dy
>  
> Here is the .ctl file for the meridional wind:
>  
> DSET vwndavg2001.nc <http://vwndavg2001.nc>
> OPTIONS template
> DTYPE netcdf
> XDEF longitude 144 linear 0.0 2.5
> YDEF latitude 73 linear -90 2.5
> TDEF time 1 linear 0z1Jan2001 1dy
>  
> The variables for both are U and V respectively.  However since the 
> meridional file is open second the meridional wind becomes defined as 
> V.2.  Therefore, I have to redefine V=V.2.  However when I run GrADS 
> script traj.gs <http://traj.gs> I get the following message:
>  
>  
> Please open file and draw a chart
>  
> How can I avoid this message and run traj.gs <http://traj.gs> 
> successfully?
>  
> Thanks,
>  
> Jason