Based on directions from the MODIS Science Team, LP DAAC has decommissioned all previous versions of Terra/MODIS and Aqua/MODIS Yearly Net Primary Production products. Currently, Terra/MODIS Version 055 (MOD17A3), produced by the University of Montana’s Numerical Terradynamic Simulation Group (NTSG), is the only available version of these products. Users may consult the note referenced in the following news release for an explanation of the differences between the NTSG and NASA versions of this product: Terra MODIS GPP/NPP Products from NTSG/University of Montana