The MYD13A1 Version 6 product provides Vegetation Index (VI) values at a per pixel basis at 500 meter (m) spatial resolution. There are two primary vegetation layers. The first is the Normalized Difference Vegetation Index (NDVI), which is referred to as the continuity index to the existing National Oceanic and Atmospheric Administration-Advanced Very High Resolution Radiometer (NOAA-AVHRR) derived NDVI. The second vegetation layer is the Enhanced Vegetation Index (EVI), which has improved sensitivity over high biomass regions. The algorithm for this product chooses the best available pixel value from all the acquisitions from the 16 day period. The criteria used is low clouds, low view angle, and the highest NDVI/EVI value.

Provided along with the vegetation layers and two quality assurance (QA) layers are reflectance bands 1 (red), 2 (near-infrared), 3 (blue), and 7 (mid-infrared), as well as four observation layers.

Validation at stage 3 has been achieved for all MYD13 vegetation products. Further details regarding product validation for the MYD13A1 data product is available from the MODIS land team validation site.

Improvements/Changes from Previous Versions

• The 16-day composite VI is generated using the two 8-day composite surface reflectance granules (MYD09A1) in the 16-day period.
• This surface reflectance input is based on the minimum blue compositing approach used to generate the 8-day surface reflectance product.
• The product format is consistent with the Version 5 product generated using the Level 2 gridded daily surface reflectance product.
• A frequently updated long-term global Climate Modeling Grid (CMG) Average Vegetation Index product database is used to fill the gaps in the CMG product suite.

Citation

PI Name: Kamel Didan

DOI: 10.5067/MODIS/MYD13A1.006

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