[Opengrads-devel] Grib2 extension

[Arlindo da S. <da...@al...>]

All,
  I have put together a very simple extension for providing Grib-2 support
in GrADS v1.9. My main motivation is to be able to use lats4d to convert
Grib-2 files to HDF. Right now, the implementation is limited to lat/lon
grids, and there is no PDEF support. I suspect it is a bit slower than grads
v2, but it is quite usable. There is no caching, and since this is v1.9, all
is float32 which is good for older, less powerful boxes. It works something
like this:

% g2gdf gfs.t00z.pgrb2bf00
% grads
...
ga-> g2_open gfs.t00z.pgrb2bf00.gdf
ga-> d g2(hgtprs)

You have to go though function g2() to get a variable, other than that you
can plot cross sections and time-series just the same. Templating is also
supported. Gribmap is not used. Documentation is here:

   http://opengrads.org/doc/udxt/grib2/


You will need both g2ctl.pl and wgrib2 v1.7.2 or later. You can get wgrib2
builds here:



http://sourceforge.net/project/showfiles.php?group_id=161773&package_id=263736


  If you have a chance to play with it I'd appreciate hearing from you. I
don't have grib2.gex binaries, but coulld provide some if you would like to
give it a try. Otherwise, it builds trivially:


% gacvs co -P Grads

% cd Grads/extensions/ams

% gmake


I'd like to release grib2.gex with the next UDXT bundle. Any comments
greatly appreciated.


  Cheers!


     Arlindo




-- 
Arlindo da Silva
da...@al...