MOD13C2 v006

MODIS/Terra Vegetation Indices Monthly L3 Global 0.05 Deg CMG


PI: Kamel Didan

Description

The MOD13C2 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 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 MOD13C1 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.

Characteristics

Improvements/Changes from Previous Versions

  • The 16-day composite VI is generated using the two 8-day composite surface reflectance granules (MOD09A1) 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 CMG Average Vegetation Index product database is used to fill the gaps in the CMG product suite.

Product Maturity

Validation at stage 3 has been achieved for all MOD13 vegetation products. Further details regarding product validation for the MOD13C2 data product is available from the MODIS land team validation site.

Collection and Granule

Collection

Characteristic Description
CollectionTerra MODIS
DOI10.5067/MODIS/MOD13C2.006
File Size~99 MB
Temporal ResolutionMonthly
Temporal Extent2000-02-01 to Present
Spatial ExtentGlobal
Coordinate SystemGeographic Latitude and Longitude
DatumN/A
File FormatHDF-EOS
Geographic DimensionsGlobal

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers13
Columns/Rows7200 x 3600
Pixel Size5600 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor Additional Offset
CMG 0.05 Deg Monthly NDVI 16 day NDVI NDVI 16-bit signed integer -3000 N/A -2000 to 10000 0.0001 N/A
CMG 0.05 Deg Monthly EVI 16 day EVI EVI 16-bit signed integer -3000 N/A -2000 to 10000 0.0001 N/A
CMG 0.05 Deg Monthly VI Quality VI quality indicators Bit Field 16-bit unsigned integer 65535 N/A 0 to 65534 N/A N/A
CMG 0.05 Deg Monthly red reflectance Surface Reflectance Band 1 N/A 16-bit signed integer -1000 N/A 0 to 10000 0.0001 N/A
CMG 0.05 Deg Monthly NIR reflectance Surface Reflectance Band 2 N/A 16-bit signed integer -1000 N/A 0 to 10000 0.0001 N/A
CMG 0.05 Deg Monthly blue reflectance Surface Reflectance Band 3 N/A 16-bit signed integer -1000 N/A 0 to 10000 0.0001 N/A
CMG 0.05 Deg Monthly MIR reflectance Surface Reflectance Band 7 N/A 16-bit signed integer -1000 N/A 0 to 10000 0.0001 N/A
CMG 0.05 Deg Monthly Avg sun zen angle Sun zenith angle of VI Pixel Degree 16-bit signed integer -10000 N/A -9000 to 9000 0.01 N/A
CMG 0.05 Deg Monthly NDVI std dev Standard deviation computed from input NDVI pixels NDVI 16-bit signed integer -3000 N/A 0 to 10000 0.0001 N/A
CMG 0.05 Deg Monthly EVI std dev Standard deviation computed from input EVI pixels EVI 16-bit signed integer -3000 N/A 0 to 10000 0.0001 N/A
CMG 0.05 Deg Monthly #1km pix used Number of 1 km input pixels used Number 8-bit unsigned integer 255 N/A 0 to 36 N/A 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 8-bit unsigned integer 255 N/A 0 to 36 N/A N/A
CMG 0.05 Deg Monthly pixel reliabilty Quality reliability of VI pixel Rank 8-bit signed integer -1 N/A 0 to 4 N/A N/A

Product Quality

The "CMG 0.05 Deg Monthly VI Quality" layer is stored in an efficient bit-encoded manner. The unpack_sds_bits executable from the LDOPE Tools is available to the user community to help parse and interpret the quality layer.

The QA bit flags for the "CMG 0.05 Deg Monthly pixel reliabilty" layer are provided in Table 18 on page 27 and the "CMG 0.05 Deg Monthly VI Quality" layer in Table 5 on page 16 of the User Guide.

Known Issues

For complete information about the MOD13C2 known issues please refer to the MODIS Land Quality Assessment website.

Documentation

Using the Data

E-Learning

Getting Started with MODIS Version 6 Vegetation Indices Data Part 1: All About Accessing Data

Getting Started with MODIS Version 6 Vegetation Indices Data Part 2: Using the Data

Getting Started with MODIS Version 6 Vegetation Indices Data Part 3: Interpreting Quality Information

Data In Action

Highlights from the NASA DEVELOP National Program Spring 2018 Term

Sensing Our Planet: NASA Earth Science Research Features 2015

Highlights from the Literature: July to September 2014

Sensing Our Planet: NASA Earth Science Research Features 2016

Tools

Citation

DOI: 10.5067/MODIS/MOD13C2.006

About the Image