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Description
The MYD15A2H Version 6.1 Moderate Resolution Imaging Spectroradiometer (MODIS) combined Leaf Area Index (LAI) and Fraction of Photosynthetically Active Radiation (FPAR) product is an 8-day composite dataset with 500 meter (m) pixel size. The algorithm chooses the "best" pixel available from all the acquisitions of the Aqua sensor from within the 8-day period.
LAI is defined as the one-sided green leaf area per unit ground area in broadleaf canopies and as one-half the total needle surface area per unit ground area in coniferous canopies. FPAR is defined as the fraction of incident photosynthetically active radiation (400-700 nanometers (nm)) absorbed by the green elements of a vegetation canopy.
Science Datasets (SDS) in the Level 4 (L4) MYD15A2H product include LAI, FPAR, two quality layers, and standard deviation for LAI and FPAR. Two low resolution browse images, LAI and FPAR, are also available for each MYD15A2H granule.
The following changes and improvements were implemented for inputs to MODIS Version 6.1 LAI/FPAR data products: (1) 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, and (2) A polarization correction has been applied to the L1B Reflective Solar Bands (RSB).
Land Processes Distributed Active Archive Center (LP DAAC)
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MODIS Adaptive Processing System, Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/MODAPS)
Fraction Of Absorbed Photosynthetically Active Radiation (fapar)
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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Myneni, R., Knyazikhin, Y., & Park, T. (2021). MODIS/Aqua Leaf Area Index/FPAR 8-Day L4 Global 500m SIN Grid V061 [Dataset]. NASA Land Processes Distributed Active Archive Center. https://doi.org/10.5067/MODIS/MYD15A2H.061 Date Accessed: 2026-06-16
Myneni, R., Knyazikhin, Y., & Park, T. (2021). MODIS/Aqua Leaf Area Index/FPAR 8-Day L4 Global 500m SIN Grid V061 [Dataset]. NASA Land Processes Distributed Active Archive Center. https://doi.org/10.5067/MODIS/MYD15A2H.061 Date Accessed: 2026-06-16
Myneni, Ranga, et al. “MODIS/Aqua Leaf Area Index/FPAR 8-Day L4 Global 500m SIN Grid V061.” NASA Land Processes Distributed Active Archive Center, 2021, https://doi.org/10.5067/MODIS/MYD15A2H.061. Date Accessed: 2026-06-16
File Naming Convention
MYD15A2H.A2025209.h16v07.061.2025218035513.hdf
The file name begins with the Product Short Name (MYD15A2H) followed by the Julian Date of Acquisition formatted as AYYYYDDD (A2025209), the Tile Identifier which is horizontal tile and vertical tile provided as hXXvYY (h16v07), the Version of the data collection (061), the Julian Date and Time of Production designated as YYYYDDDHHMMSS (2025218035513), and the Data Format (hdf).