Fw: Re: (NCEP 1degree x 1 degree - model output 0.7x 0.7degree ) temperature pattern in GrADS

[Rupesh Patil]

Dear sir,

thanks for reply..
please see following sentences,

ga -> open D:/g1.ctl                !  I  open description file of model data having variable ' t' 
                                                       and resolution 0.7 degree X 0.7 degree .   !





ga -> tmp=re2(t,1)                     !  ' t ' is a variable of model output. I converted it  in
                                                              1degree x 1 degree  data in GraDS  2.0 !



ga -> sdfopen  D:/13jan2002.nc                 !    now i open NCEP 1degree x degree  data 
                                                                              having variable tmp  !                                                                              



ga -> d tmp.2       
                                                 !          error  :    grads window   shows   " Entire Grid is 
or                                                                                 undefined "   !   
ga -> d tmp -tmp.2



Sir didn't understand , why  does grads window show   " Entire Grid is 
 undefined " ?

please help me.


Regards,
Rupesh






--- On Mon, 22/3/10, Sestak, Michael L CIV 63134 <michael.l.sestak at NAVY.MIL> wrote:

From: Sestak, Michael L CIV 63134 <michael.l.sestak at NAVY.MIL>
Subject: Re: (NCEP 1degree x 1 degree  -  model output 0.7x 0.7degree   )  temperature pattern in GrADS
To: GRADSUSR at LIST.CINECA.IT
Date: Monday, 22 March, 2010, 7:44 PM

To just plot one on top of another is no problem.  Just open each file (or appropriate control file) in grads then plot tm2.1 then plot tm2.2 (tm2 being whatever your temperature variable is called).  If you actually want to plot the difference, you have to interpolate.  I believe there is a built in re2 function in grads 2.0, in older versions you have to use the regrid2 udf.  There are lots of messages about these routines in the grads user list archive (which should be moved to the new location by now?).

Michael Sestak
Fleet Numerical Meteorology and Oceanography Center
Monterey, CA 

-----Original Message-----
From: GRADSUSR at LIST.CINECA.IT [mailto:GRADSUSR at LIST.CINECA.IT] On Behalf Of Rupesh Patil
Sent: Saturday, March 20, 2010 5:48
To: GRADSUSR at LIST.CINECA.IT
Subject: (NCEP 1degree x 1 degree - model output 0.7x 0.7degree ) temperature pattern in GrADS





Dear Grads users,
 
 I have to compare model output of temperature with NCEP 1degree x 1 degree data . But model output of temperature is in binary format having resolution 0.7degree x 0.7 degree and NCEP data is in Grib or .nc  format having resolution 1degree x 1 degree .

Can we plot , NCEP 1degree x 1 degree   minus  model output of temperature in GrADS.

I use Grads version 1.9b4 on linux machine

 
Thanks so much!

Regards,
Rupesh.Patil
Junior research fellow,
space and atmospheric sciences ,
pune university.  





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