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20060627: GDDIAG problem in GEMPAK

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  • Subject: 20060627: GDDIAG problem in GEMPAK
  • Date: 27 Jun 2006 14:21:16 -0600
Chris,

Your problem in precision of the stored diagnostic is due to your GPACK
setting in GDDIAG.

The GPACK parameter will use GRIB/16 if left blank. Since you identified
the problem as a large range of data values, you likely need to increase
the number of packing bits being used, or set GPACK=NONE.

Steve Chiswell
Unidata User Support


On Tue, 2006-06-27 at 13:59, Melick, Christopher James (UMC-Student)
wrote:
> Hello,
>  
> I am having problems with the output generated within GDDIAG when I am 
> declaring a parameter in GRDNAM that is the quotient of two parameters, the 
> one in the denominator encompassing a large range in scales [in this 
> instance, the squared difference of the vertical change in geostrophic wind]. 
>  Several grid points will have identical values if I use the newly generated 
> grid file which should not occur.  However, a completely different and more 
> accurate result will occur if I manually type in the quotient of the two 
> parameters myself in GFUNC.  What causes this and is there a means to fix 
> it??  I hope I have explained my dilemma clearly and completely enough to 
> follow.  There are no GEMPAK errors in the logfiles and I have tried creating 
> a separate script just for this particular term with no success.  
>  
> Thank you very much,
> Chris Melick
> ___________________________________________________________
> Christopher J. Melick
> Ph.D. Student, Atmospheric Science
> Department of Soil, Env, and Atmos Sciences
> University of Missouri-Columbia
> 302 ABNR Building
> Columbia, MO 65211
> 
> address@hidden
> (573)-239-3999  cell
> (573)-882-7739  work
> 
> 
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