[gradsusr] cat different resolution GFS files

[Wesley Ebisuzaki - NOAA Federal]

Brian,

   You can cat grib2 files together but GrADS can only handle 1 grid definition
per control file.   You can use wgrib2 to convert your grib file to a common
grid by

   wgrib2 IN.grb -new_grid_wind earth -new_grid latlon lon0:nlon:dlon
lat0:nlat:dlat  OUT.grb

This requires that your wgrib2 was compiled with the optional IPOLATES library.

Wesley



On Sat, Apr 13, 2013 at 1:34 PM, Brian Gaze <brian.gaze at ntlworld.com> wrote:
> Hi,
>
> I'm trying to cat GFS GRIB2 files at 12 hour steps, from 0 to 384 hours, and
> then use the concatenated file which is generated for plots in GrADS. The
> GFS files I'm using are 0.5 deg from 0 to 192 hours, and 1 deg from 204 to
> 384 hours. The cat seems to work ok, and I'm able to open and query the file
> in GrADS. The problem is that when I try and make a plot (using set t 1
> last) only values for 0 to 192 hours (the 0.5 deg files) are plotted.
>
> Is the problem occurring because I'm  concatenating different resolution
> files (0.5 deg and 1 deg)? If this is the case, is there a workaround /
> solution other than switching over to 1 deg files for the full range?
>
> PS: Using GrADS 2.0.a3.oga.1
>
> Thanks
>
> Brian
>
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