http://en.wikipedia.org/wiki/GRIB
http://www.ecmwf.int/products/data/software/grib.html
http://badc.nerc.ac.uk/help/formats/grib/
http://cf-pcmdi.llnl.gov/documents/cf-standard-names/ecmwf-grib-mapping
http://www.wmo.ch/pages/prog/www/WDM/Guides/Guide-binary-2.html
http://grupos.unican.es/ai/meteo/MeteoLab.html
http://www-imk.fzk.de/asf/kasima/aktuelles/grib/