Description
The MOD17A2H Version 6.1 Gross Primary Productivity (GPP) product is a cumulative 8-day composite of values with 500 meter (m) pixel size based on the radiation use efficiency concept that can be potentially used as inputs to data models to calculate terrestrial energy, carbon, water cycle processes, and biogeochemistry of vegetation. The data product includes information about GPP and Net Photosynthesis (PSN). The PSN band values are the GPP less the Maintenance Respiration (MR). The data product also contains a PSN Quality Control (QC) layer. The quality layer contains quality information for both the GPP and the PSN.
Known Issues
- For complete information about known issues please refer to the MODIS/VIIRS Land Quality Assessment website.
Improvements/Changes from Previous Versions
- The Version 6.1 Level-1B (L1B) products have been improved by undergoing various calibration changes that include: changes to the response-versus-scan angle (RVS) approach that affects reflectance bands for Aqua and Terra MODIS, corrections to adjust for the optical crosstalk in Terra MODIS infrared (IR) bands, and corrections to the Terra MODIS forward look-up table (LUT) update for the period 2012 - 2017.
- A polarization correction has been applied to the L1B Reflective Solar Bands (RSB).
- The product uses Climatology LAI/FPAR as back up to the operational LAI/FPAR.
Product Summary
Citation
Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.
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Documents
ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD) | The ATBD provides physical theory and mathematical procedures for the calculations used to produce the data products. | |
GENERAL DOCUMENTATION | The File Specification provides a description of the product file including Scientific Data Sets and their attributes. | |
PRODUCT QUALITY ASSESSMENT | The LDOPE Land Product Quality Assessment website provides known issues, maneuvers, and product quality of the land products. | |
SCIENCE DATA PRODUCT VALIDATION | Validation at stage 3 has been achieved for the MODIS Gross and Net Primary Productivity data products. | |
SCIENCE DATA PRODUCT VALIDATION | Further details regarding MODIS land product validation for the MOD17 data products are available from the MODIS Land Team Validation site. |