MODIS Aqua Gross Primary Productivity Gap-Filled 8-Day L4 Global 500m 2002

The MODIS Aqua MYD17A2HGF Version 6.1 product provides a gap-filled 8-day cumulative composite of Gross Primary Productivity (GPP) at 500 m spatial resolution. The dataset is based on the radiation use efficiency concept and can be used as input for models analyzing terrestrial energy balance, carbon and water cycles, and vegetation biogeochemistry. In addition to GPP, the product includes Net Photosynthesis (PSN), calculated as GPP minus Maintenance Respiration (MR), along with a quality control (QC) layer providing quality information for both variables. The gap-filled product is generated at the end of each year once the complete annual MYD15A2H LAI/FPAR dataset becomes available. Poor-quality LAI/FPAR inputs are identified using quality control flags and replaced through linear interpolation, improving the consistency of the final dataset. Consequently, the MYD17A2HGF product is not available in near-real time and is produced only after the completion of the full yearly dataset.