The Terra/MODIS Gross Primary Productivity (GPP) product (MOD17A2H) is a cumulative composite of GPP values based on the radiation-use efficiency concept that is potentially used as inputs to data models to calculate terrestrial energy, carbon, water cycle processes, and biogeochemistry of vegetation. MOD17A2H is an 8-day composite at 1-km spatial resolution delivered as a gridded Level-4 product in Sinusoidal projection.
The MODIS Adaptive Processing System (MODAPS) at the NASA Goddard Space Flight Center produces this Collection-5 GPP product. This version contains some cloud-contaminated LAI/FPAR inputs that users should exclude by flagging them as part of the quality assessment filters. Once the cloud-contaminated pixels are excluded, this dataset may serve the near-real-time needs for the current calendar year. Following the completion of the current calendar year, users are encouraged to use the Numerical Terradynamic Simulation Group (NTSG)/University of Montana's (UMT) version of this product available as Collection-55 from the LP DAAC. For more information, refer to the product details via the 'Version 055' tab. For further details regarding the differences between the NTSG and NASA versions of this product, please consult the document referenced in the following notice:
Terra MODIS GPP/NPP Products from NTSG/University of Montana
Collection-5 and Collection-55 Terra/MODIS GPP products are validated to Stage-3; this means that its accuracy was assessed and uncertainties in the product were well-established via independent measurements made in a systematic and statistically robust way that represents global conditions. These data are deemed ready for use in science applications.