All,

    This is a preliminary version of some code that was able
to convert a specific MERRA HDF file into grib2.  It works
but the metadata may not be filled in.

   Procedure:

   gradshdf			run gradshdf

   sdfopen MERRA100.prod.assim.inst6_3d_ana_Np.19790101.hdf
				open merra hdf file

   merra2grb.gs			run a grads script


The merra2grb.gs script creates a data dump of the
file (test) and an inventory (test.inv) of the data dump.
wgrib2 then uses the grib2 file, hires-merra.template.grb as
a template. wgrib2 takes the template, data dump and inventory
can creates a grib2 file (test.grb2).

This code works on the supplied file and can be used as
the stepping stone for your own grads-compatible file
to grib2 converter.  The hard part is creating your own
template file.  

           Wesley