The two files COSMO_REA6_CONST_withOUTsponge.grb.bz2 and
COSMO_REA6_CONST_withOUTsponge.nc.bz2 contain constant parameters
the COSMO-EU model uses as input. These parameters are provided in
netCDF and in grb format.

Please use the parameters RLON and RLAT as the longitude and
latitude information for the final grid (e.g., when comparing
against measurement data). 

The parameter Z0 is constant only over the land surface. Over
the ocean, it is time dependent and depends on the height of
the waves due to near surface wind speed.

The file griddes_REA6.txt holds the grid description of the COSMO-REA6
data. It can be used together with the CDOs in order to convert the original
grib files into netCDF format and preserve the unstructured longitude and
latitude fields.