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20001106: GEMPAK NAGRIB and NCEP reanalysis on gaussian grid

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  • Subject: 20001106: GEMPAK NAGRIB and NCEP reanalysis on gaussian grid
  • Date: Mon, 06 Nov 2000 14:23:18 -0700
Werner,

No, the decoder cannot handle the gaussian grid.

Since GEMPAK grid programs only handle rectangular grids, the
decoder would first have to interpolate the gaussian points
to a known projection before writing them out.

Steve Chiswell
Unidata User SUpport



>From: Werner Wintels <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200011062112.eA6LC5417026

>
>I am trying to convert GRIB data (NCEP reanalysis on a Gaussian grid 
>from the NCAR mass storage system) to gempak format using NAGRIB in GEMPAK 
>version 5.4. 
>
>The settings are as follows:
>
>
> GBFILE = grb3d89010100
> INDXFL =
> GDOUTF = 8801.01_10.gaussian.gem
> PROJ =
> GRDAREA =
> KXKY =
> MAXGRD =
> CPYFIL = GDS
> GAREA =
> OUTPUT = T
> GBTBLS = 
> GBDIAG =
>
>My understanding is that this should read the grib file header in 
>grb3d89010100, create a gempak file 8801.01_10.gaussian.gem, create a 
>navigation grid corresponding to the grib header, and translate the data 
>accordingly. 
>
>However, I get the following error:
>
>         0 GRIB messages were read or scanned from the GRIB file: 
>     
>grb3d89010100
>         0 grids were written to the GEMPAK file: 
>     
>8801.01_10.gaussian.gem
>
>
>Can the decoder handle the gaussian grid?
>
>
>********************************
>Werner Wintels 
>Atmospheric and Oceanic Sciences
>McGill University    
>Montreal, Canada
>********************************
>