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20041007: NAGRIB for conversion of NCEP/NCAR reanalysis

Luis,

GEMPAK does not support Gaussian grid decoding.
The GEMPAK grid file requires a regularly spaced grid,
whereas the gaussian grid spacing varies latitudinally.

Steve Chiswell
Unidata User Support




>From: address@hidden
>Organization: UCAR/Unidata
>Keywords: 200410071543.i97Fh8UE012341

>Steve,
>this is a request to get your assistance in the conversion of
>data (grib format) from the NCEP/NCAR reanalysis into a
>gempak grid file.
>
>I am able to used NAGRIB to convert 3-D fields with no problem
>but can not run it successfully for 2-D fields that seem to be
>in a gaussian grid type. Basically, these are the input 
>parameters I am providing:
> GBFILE   = /home/farfan/NCEP_NCAR_REANALYSIS/2003/tmp.surface.grib
> INDXFL   =
> GDOUTF   = tmp.surface.gem
> PROJ     =
> GRDAREA  =
> KXKY     =
> MAXGRD   = 6
> CPYFIL   = GDS
> GAREA    = grid
> OUTPUT   = T
> GBTBLS   = $GEMTBL/grid/ncarncep1.tbl
> GBDIAG   = all
> PDSEXT   = NO
>
>and the output looks like this:
>Changing center table to cntrgrib1.tbl
>Changing vertical coord table to vcrdgrib1.tbl
>Changing WMO parameter table to
>/home/gempak/GEMPAK5.6.H/gempak/tables/grid/ncarncep1.tbl
>Changing center parameter table to ncepgrib2.tbl
>Creating the GEMPAK grid file...
>[NAGRIB -12]  Error creating GEMPAK grid file.
>
>     0 GRIB messages were read or scanned from the GRIB file:
>     /home/farfan/NCEP_NCAR_REANALYSIS/2003/tmp.surface.grib
>
>     0 grids were written to the GEMPAK file:
>     tmp.surface.gem
>
>Parameters requested: GBFILE,INDXFL,GDOUTF,PROJ,GRDAREA,KXKY,MAXGRD,CPYFIL,
>GAREA,OUTPUT,GBTBLS,GBDIAG,PDSEXT.
>
>Following your archive of e-mail support (gempak and gembud-list), I found
>a couple of examples and followed their suggestions. The most I can do is 
>to used a previously generated grid file in CPYFIL; however, none of the
>grid files were written to the gempak file yet.
>
>I also used GDOUTF=LIST and GBDIAG=ALL but I am not able to detect the source
>of problems. If this helps, I can provide this information later.
>
>Any assistance you could give would be much appreciated.
>
>Thanks, Luis M Farfan.
>
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