Using traj.gs

[Jason Snyder]

On Sun, Jan 24, 2010 at 4:16 PM, Jason Snyder <jmssnyder at ucdavis.edu> wrote:

> I tried running traj.gs again after displaying a map and I got the
> following message:
>
> ga-> d U;V
> ga-> traj.gs
> HR or MN missing in line TDEF of file uninan.ctl
> ga->
> Here is an example of a .ctl file I have for the zonal wind part of my
> data:
>
> DSET uninan2.nc
> OPTIONS template
> DTYPE netcdf
> XDEF longitude 57 linear 110.0 2.5
> YDEF latitude 39 linear -5 2.5
> TDEF time 1 linear 0z1Jun1974 1dy 0hr 0mn
> How do I modify this file so I can succesfuuly run traj.gs?
>
> Thanks,
>
> Jason
>   On Sun, Jan 24, 2010 at 2:59 PM, James T. Potemra <jimp at hawaii.edu>wrote:
>
>> 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
>>>
>>
>
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