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Description
The MYD13C1 Version 6 data product was decommissioned on July 31, 2023. Users are encouraged to use the MYD13C1 Version 6.1 data product.
The MYD13C1 Version 6 product provides a Vegetation Index (VI) value at a per pixel basis. 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 Climate Modeling Grid (CMG) consists 3,600 rows and 7,200 columns of 5,600 meter (m) pixels. Global MYD13C1 data are cloud-free spatial composites of the gridded 16-day 1 kilometer MYD13A2 data, and are provided as a Level 3 product projected on a 0.05 degree (5,600 m) geographic CMG. The MYD13C1 has data fields for NDVI, EVI, VI QA, reflectance data, angular information, and spatial statistics such as mean, standard deviation, and number of used input pixels at the 0.05 degree CMG resolution.
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). MYD13C1 MODIS/Aqua Vegetation Indices 16-Day L3 Global 0.05Deg CMG V006 [Data set]. NASA Land Processes Distributed Active Archive Center. https://doi.org/10.5067/MODIS/MYD13C1.006 Date Accessed: 2026-05-01
Didan, Kamel. “MYD13C1 MODIS/Aqua Vegetation Indices 16-Day L3 Global 0.05Deg CMG V006.” NASA Land Processes Distributed Active Archive Center, 2015. doi:10.5067/MODIS/MYD13C1.006. Date Accessed: 2026-05-01
Didan, Kamel. MYD13C1 MODIS/Aqua Vegetation Indices 16-Day L3 Global 0.05Deg CMG V006. NASA Land Processes Distributed Active Archive Center, 2015, doi:10.5067/MODIS/MYD13C1.006. Date Accessed: 2026-05-01
File Naming Convention
MYD13C1.A2002265.006.2015151155950.hdf
The file name begins with the Product Short Name (MYD13C1) followed by the Julian Date of Acquisition formatted as AYYYYDDD (A2002265), the Version of the data collection (006), the Julian Date and Time of Production designated as YYYYDDDHHMMSS (2015151155950), and the Data Format (hdf).
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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.
