Description
The Terra Moderate Resolution Imaging Spectroradiometer (MODIS) Vegetation Indices Monthly (MOD13C2) Version 6.1 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 of 3,600 rows and 7,200 columns of 5,600 meter (m) pixels. In generating this monthly product, the algorithm ingests all the MOD13A2 products that overlap the month and employs a weighted temporal average. Global MOD13C2 data are cloud-free spatial composites and are provided as a Level 3 product projected on a 0.05 degree (5,600 m) geographic CMG. The MOD13C2 has data fields for the 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
- For complete information about known issues please refer to the MODIS/VIIRS Land Quality Assessment website.
Improvements/Changes from Previous Versions
- The 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.
- A polarization correction has been applied to the L1B Reflective Solar Bands (RSB).
Version Description
Product Summary
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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File Naming Convention
The file name begins with the Product Short Name (MOD13C2) followed by the Julian Date of Acquisition formatted as AYYYYDDD (A2025152), the Version of the data collection (061), the Julian Date and Time of Production designated as YYYYDDDHHMMSS (2025206111023), and the Data Format (hdf).
Documents
USER'S GUIDE
ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)
PRODUCT QUALITY ASSESSMENT
SCIENCE DATA PRODUCT VALIDATION
Publications Citing This Dataset
Variables
Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.
The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.
Name Sort descending | Description | Units | Data Type | Fill Value | Valid Range | Scale Factor |
---|---|---|---|---|---|---|
CMG 0.05 Deg Monthly EVI std dev | Standard deviation computed from input EVI pixels | EVI | int16 | -3000 | -3000 to 10000 | 0.0001 |
CMG 0.05 Deg Monthly NDVI | 16 day NDVI | NDVI | int16 | -3000 | -3000 to 10000 | 0.0001 |
CMG 0.05 Deg Monthly number of 1km pix used | Number of 1 km input pixels used | Number | uint8 | 255 | 255 to 36 | N/A |
CMG 0.05 Deg Monthly #1km pix +-30deg VZ | Number of 1km pixels used with VZ angle less than + or - 30 degs | Number | uint8 | 255 | 255 to 36 | N/A |
CMG 0.05 Deg Monthly Avg sun zen angle | Sun zenith angle of VI Pixel | Degree | int16 | -10000 | -10000 to 9000 | 0.01 |
CMG 0.05 Deg Monthly blue reflectance | Surface Reflectance Band 3 | N/A | int16 | -1000 | -1000 to 10000 | 0.0001 |
CMG 0.05 Deg Monthly EVI | 16 day EVI | EVI | int16 | -3000 | -3000 to 10000 | 0.0001 |
CMG 0.05 Deg Monthly MIR reflectance | Surface Reflectance Band 7 | N/A | int16 | -1000 | -1000 to 10000 | 0.0001 |
CMG 0.05 Deg Monthly NDVI std dev | Standard deviation computed from input NDVI pixels | NDVI | int16 | -3000 | -3000 to 10000 | 0.0001 |
CMG 0.05 Deg Monthly NIR reflectance | Surface Reflectance Band 2 | N/A | int16 | -1000 | -1000 to 10000 | 0.0001 |
CMG 0.05 Deg Monthly pixel reliabilty | Quality reliability of VI pixel | Rank | int8 | -1 | -1 to 4 | N/A |
CMG 0.05 Deg Monthly red reflectance | Surface Reflectance Band 1 | N/A | int16 | -1000 | -1000 to 10000 | 0.0001 |
CMG 0.05 Deg Monthly VI Quality | VI quality indicators | Bit Field | uint16 | 65535 | 65535 to 65534 | N/A |