hdf file naming convention
npp = net primary production (units of mg C / m**2 / day)
yyyy = year
hdf = file type
files are internally gzipped with hrepack (no need to uncompress before using)
The hdf files have metadata contained within them, which can be examined, for example, with program "ncdump".
terrestrial npp is based on the 0.05 degree aggregated improved Collection 5.1 annual MOD17A3 npp output from the Numerical Terradynamic Simulation Group (NTSG) at the University of Montana;
oceanic npp is based on the standard vgpm, using seawifs chl, avhrr sst, and seawifs par as input;
oceanic clouds have been filled in the input data using our own gap-filling software.
For citation, please reference
Zhao et al, 2005
for terrestrial npp information,
the original vgpm paper by
Behrenfeld and Falkowski, 1997a
for the oceanic npp model, as well as the
Ocean Productivity site
for the data.