Writing NETCDF files form GRADS 1.94b?

Arlindo da Silva dasilva at ALUM.MIT.EDU
Tue May 20 22:17:43 EDT 2008

On Tue, May 20, 2008 at 2:47 PM, Kevin M Levey <klevey at customweather.com>

> TUE 20MAY08: 1140PDT
> Dear Grads Users
> I was always under the impression that one could NOT write out NETCDF files
> from GRADS directly, but that you had to use LATS4D to accomplish this.
> However, on the latest update of the GRADS pages found at:
> http://grads.iges.org/grads/downloads.html
> I see this:
> The GrADS exectuables for versions *1.9 *and earlier are as follows:
> gradsc Reads GRIB, gridded binary, BUFR, GrADS station data
> Writes GRIB
> *gradsnc* Reads GRIB, gridded binary, BUFR, GrADS station data, NetCDF
> *Writes *GRIB, *NetCDF*
> Is this a mistake, and if not, how does one write NETCDF formatted output
> directly from GRADS 1.9b4? I thought one could only write gridded binary
> files. I have never been able to find any documentation regarding this
> (writing NETCDF output from GRADS). I know that version 2.0 is slated to
> have the NETCDF "write" functionality built into it in upcoming releases.

Since v1.7 you can write NetCDF/HDF and GRIB-1 files from GrADS using the
LATS interface. Basically you do a bunch of "set lats ..." commands, do a
"set gxout lats" and when you display a variable it goes into your netcdf or
grib-1 file. Lats4d is simply a GrADS script that serves as a frontend to
the LATS interface, a convenience script of sorts. (BTW, lats4d can also
serve as a front end to "set gxout fwrite".) Unfortunately, the LATS
interface has been removed from v2, so the only thing lats4d can do there is
to write binaries.

I am not aware of any documentation for the LATS interface. I learned how
use it by following Mike Fiorino's examples.  Lats4d has a built in man page
that documents (almost) all of its options (I left  some NASA specific
options undocumented as they are not relevant to the general user.)


Arlindo da Silva
dasilva at alum.mit.edu
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