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20060103: Question about gdgrib

David,

A new feature since the old version of GEMPAK you have is the ability to
do grid interpolation on the fly. If you want to generate a CED grid
from your LCC grid, you can use GDDIAG and write the output to the
CED file (which gdgrib can create now, it the file doesn't exist).

Of course, you don't have to interpolate the grids first to use
the LCC grids in a caculation involving CED grids, but if thats the
way tou need to formulate your diagnostics, you can.

Steve Chiswell
Unidata User Support



On Mon, 2006-01-02 at 10:10, David Gold wrote:
> Steve,
> 
>  
> 
> I am not sure whether I should have posted this on the Unidata support
> forum. If so, please let me know and Ill register there and post.
> 
>  
> 
> I am working on some publications stemming from my PhD work completed
> last year under John Nielsen-Gammon at TAMU and I wish to begin using
> NARR data instead of the coarser NCEP reanalysis ds090.0 from the
> NCAR-MSS (which I used in the dissertation). My goal is NOT simply to
> display the NARR fields in Gempak, instructions for which Ive found
> at http://www.atmos.albany.edu/facstaff/rmctc/gempak/index.html#narr
> and http://www.atmos.albany.edu/facstaff/rmctc/narr/#calc. I am
> planning to upgrade from Gempak 5.7.4 to 5.9.1 soon, so I should be
> able to circumvent the problems associated with earlier Gempak
> versions and the missing grib parameter table (WMO Grib Table 2
> Version 131).
> 
>  
> 
> What I wish to do is to perform advanced diagnostic calculations on
> NARR datacomputations that are outside the scope of Gempak (PV
> inversion). Ive determined that the best way to proceed (after
> sub-setting the NARR data using wgrib) is probably to run the reduced
> NARR GRIB file through GDGRIB. The reason for this is that I need the
> variables interpolated to an equidistant (lat-lon) grid, not LCC, for
> the PV diagnostics. Am I naïve in thinking that GDGRIB can be used in
> the way that I describe (i.e., adding projection-transformed
> variables, including north-relative wind components, to a GRIB file)?
> 
>  
> 
> Sorry if Ive asked a question thats outside your purview.
> 
>  
> 
> Sincerely,
> 
>  
> 
> David Gold
> 
> Formerly with TAMU
> 
>