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Description
The MYD09GA Version 6.1 product provides an estimate of the surface spectral reflectance of Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) Bands 1 through 7, corrected for atmospheric conditions such as gasses, aerosols, and Rayleigh scattering. Provided along with the 500 meter (m) surface reflectance, observation, and quality bands are a set of ten 1 kilometer observation bands and geolocation flags. The reflectance layers from the MYD09GA are used as the source data for many of the MODIS land products.
Known Issues
Prior to the Aqua MODIS launch, Band 6 exhibited several anomalous detectors. Band 6 performance degraded seriously after launch and presently a majority of the Band 6 detectors are non-functional. Science users should read and use the non-functional detector flags and decide for themselves the optimum manner to handle non-functional detector "gaps" for their products. For complete information please refer to the MODIS Characterization Support Team (MCST) website.
The following changes and improvements were implemented for inputs to MODIS Version 6.1 surface reflectance 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)
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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Vermote, E., & Wolfe, R. (2021). MODIS/Aqua Surface Reflectance Daily L2G Global 1km and 500m SIN Grid V061 [Data set]. NASA Land Processes Distributed Active Archive Center. https://doi.org/10.5067/MODIS/MYD09GA.061 Date Accessed: 2026-05-15
Vermote, Eric, and Robert Wolfe. “MODIS/Aqua Surface Reflectance Daily L2G Global 1km and 500m SIN Grid V061.” NASA Land Processes Distributed Active Archive Center, 2021. doi:10.5067/MODIS/MYD09GA.061. Date Accessed: 2026-05-15
Vermote, Eric, and Robert Wolfe. MODIS/Aqua Surface Reflectance Daily L2G Global 1km and 500m SIN Grid V061. NASA Land Processes Distributed Active Archive Center, 2021, doi:10.5067/MODIS/MYD09GA.061. Date Accessed: 2026-05-15
File Naming Convention
MYD09GA.A2025222.h00v09.061.2025224032058.hdf
The file name begins with the Product Short Name (MYD09GA) followed by the Julian Date of Acquisition formatted as AYYYYDDD (A2025222), the Tile Identifier which is horizontal tile and vertical tile provided as hXXvYY (h10v10), the Version of the data collection (061), the Julian Date and Time of Production designated as YYYYDDDHHMMSS (2025224032058), and the Data Format (hdf).
Paz, Andrea, Brown, Jason L., Cordeiro, Carlos L. O., AguirreSantoro, Julian, Assis, Claydson, Amaro, Renata Cecilia, Raposo do Amaral, Fabio, Bochorny, Thuane, Bacci, Lucas F., Caddah, Mayara K., dHorta, Fernando, Kaehler, Miriam, Lyra, Mariana, Grohmann, Carlos Henrique, Reginato, Marcelo, SilvaBrandao, Karina Lucas, Freitas, Andre Victor Lucci, Goldenberg, Renato, Lohmann, Lucia G., Michelangeli, Fabian A., Miyaki, Cristina, Rodrigues, Miguel T., Silva, Thiago S., Carnaval, Ana C.