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Description
The MYD13A3 Version 6 data product was decommissioned on July 31, 2023. Users are encouraged to use the MYD13A3 Version 6.1 data product.
The Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) Vegetation Indices (MYD13A3) Version 6 data are provided monthly at 1 kilometer (km) spatial resolution as a gridded Level 3 product in the sinusoidal projection. In generating this monthly product, the algorithm ingests all the MYD13A2 products that overlap the month and employs a weighted temporal average.
The MODIS Normalized Difference Vegetation Index (NDVI) complements NOAA's Advanced Very High Resolution Radiometer (AVHRR) NDVI products and provides continuity for time series historical applications. MODIS also includes an Enhanced Vegetation Index (EVI) that minimizes canopy background variations and maintains sensitivity over dense vegetation conditions. The EVI uses the blue band to remove residual atmosphere contamination caused by smoke and sub-pixel thin clouds. The MODIS NDVI and EVI products are computed from surface reflectances corrected for molecular scattering, ozone absorption, and aerosols.
Vegetation indices are used for global monitoring of vegetation conditions and are used in products displaying land cover and land cover changes. These data may be used as input for modeling global biogeochemical and hydrologic processes as well as global and regional climate. Additional applications include characterizing land surface biophysical properties and processes, such as primary production and land cover conversion.
Provided along with the vegetation layers and the two quality assurance (QA) layers are reflectance bands 1 (red), 2 (near-infrared), 3 (blue), and 7 (mid-infrared), as well as three observation layers.
Known Issues
The incorrect representation of the aerosol quantities (low, average, high) in the Collection 6 MYD09 surface reflectance products may have impacted MYD13 Vegetation Index data products particularly over arid bright surfaces.
Corrections were implemented in Collection 6.1 reprocessing.
The following changes and improvements were implemented for inputs to MODIS Version 6 vegetation index data products: (1) The 16-day composite VI is generated using the two 8-day composite surface reflectance granules (MYD09A1) in the 16-day period, (2) This surface reflectance input is based on the minimum blue compositing approach used to generate the 8-day surface reflectance product, (3) The product format is consistent with the Version 5 product generated using the Level 2 gridded daily surface reflectance product, and (4) A frequently updated long-term global CMG Average Vegetation Index product database is used to fill the gaps in the CMG product suite.
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.
Copy Citation
Citation Copied
Didan, K. (2015). MYD13A3 MODIS/Aqua Vegetation Indices Monthly L3 Global 1km SIN Grid V006 [Data set]. NASA Land Processes Distributed Active Archive Center. https://doi.org/10.5067/MODIS/MYD13A3.006 Date Accessed: 2026-04-29
Didan, Kamel. “MYD13A3 MODIS/Aqua Vegetation Indices Monthly L3 Global 1km SIN Grid V006.” NASA Land Processes Distributed Active Archive Center, 2015. doi:10.5067/MODIS/MYD13A3.006. Date Accessed: 2026-04-29
Didan, Kamel. MYD13A3 MODIS/Aqua Vegetation Indices Monthly L3 Global 1km SIN Grid V006. NASA Land Processes Distributed Active Archive Center, 2015, doi:10.5067/MODIS/MYD13A3.006. Date Accessed: 2026-04-29
File Naming Convention
MYD13A3.A2002244.h12v07.006.2015151113353.hdf
The file name begins with the Product Short Name (MYD13A3) followed by the Julian Date of Acquisition formatted as AYYYYDDD (A2002244), the Tile Identifier which is horizontal tile and vertical tile provided as hXXvYY (h12v07), the Version of the data collection (006), the Julian Date and Time of Production designated as YYYYDDDHHMMSS (2015151113353), and the Data Format (hdf).
Learn how to interpret Moderate Resolution Imaging Spectroradiometer (MODIS) Vegetation Indices quality data by understanding layers, decoding bits, and using tools for quality assessment.
Photosynthesis, Primary Production, VEGETATION PRODUCTIVITY, Leaf Characteristics, Photosynthetically Active Radiation, Leaf Area Index (LAI), Fraction Of Absorbed Photosynthetically Active Radiation (fapar), Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI)
Leaf Area Index (LAI), Fraction Of Absorbed Photosynthetically Active Radiation (fapar), Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI)
The table below lists the variables contained within a single granule for this
dataset. Variables often contain observed or derived geophysical measurements
collected from a variety of sources, including remote sensing instruments on
satellite and airborne platforms, field campaigns, in situ measurements, and
model outputs. The terms variable, parameter, scientific data set, layer, and band
have been used across NASA’s Earth science disciplines; however, variable is the
designated nomenclature in NASA’s Common Metadata Repository (CMR).
Variable metadata attributes such as Name, Description, Units, Data Type, Fill
Value, Valid Range, and Scale Factor allow users to efficiently process and analyze
the data. The full range of attributes may not be applicable to all variables.
Additional information on variable attributes is typically available in the data,
user guide, and/or other product documentation.
For questions on a specific variable, please use the Earthdata Forum.
