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MYD13C1 V006

10.5067/MODIS/MYD13C1.006
MODIS/Aqua Vegetation Indices 16-Day L3 Global 0.05 Deg CMG
MYD13C1

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 m pixels. The MYD13A2 (1 km) is used to produce this product. Nominally each CMG consists of 286 tiles which are reprojected into the Geographic projection, spatially averaged and Quality Assurance (QA) filtered. The MYD13C1 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. Validation at stage 3 has been achieved for all MODIS MOD/MYD13 vegetation products.

Improvements/Changes from Previous Versions

  • The 16-day composite VI is generated using the two 8-day composite Surface Reflectance granules (MxD09A1) 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.
  • An update to the Long term Global CMG Average Vegetation Index Product database is used to fill the gaps in the CMG product suite.

Collection

Characteristic Description
Temporal Granularity 16-Day
Temporal Extent July 2002 - Present
Spatial Extent Global
File Size ~99 MB
Coordinate System Geographic Latitude and Longitude
Datum N/A
File Format HDF-EOS
Geographic Dimensions Global

 

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers 13
Columns/Rows 7200 x 3600
Pixel Size 5600 m

 

Data Layer Characteristics

SDS Name Description Units Data Type Fill Value Valid Range Scale Factor
CMG 0.05 Deg 16 days NDVI

16 day NDVI average

NDVI 16-bit signed integer

-3000

-2000 to 10000

0.0001
CMG 0.05 Deg 16 days EVI

16 day EVI average

EVI 16-bit signed integer

-3000

-2000 to 10000

0.0001
CMG 0.05 Deg 16 days VI Quality

VI quality indicators

Bit Field 16-bit unsigned integer

65535

0 to 65534

N/A
CMG 0.05 Deg 16 days red reflectance

Surface Reflectance Band 1

Reflectance 16-bit signed integer

-1000

0 to 10000

0.0001
CMG 0.05 Deg 16 days NIR reflectance

Surface Reflectance Band 2

Reflectance 16-bit signed integer

-1000

0 to 10000

0.0001
CMG 0.05 Deg 16 days blue reflectance

Surface Reflectance Band 3

Reflectance 16-bit signed integer

-1000

0 to 10000

0.0001
CMG 0.05 Deg 16 days MIR reflectance

Surface Reflectance Band 7

Reflectance 16-bit signed integer

-1000

0 to 10000

0.0001
CMG 0.05 Deg 16 days Avg sun zen angle

View zenith angle of VI Pixel

Degree 16-bit signed integer

-10000

-9000 to 9000

0.01
CMG 0.05 Deg 16 days NDVI std dev

Standard deviation computed from input NDVI pixels

NDVI 16-bit signed integer

-3000

0 to 10000

0.0001
CMG 0.05 Deg 16 days EVI std dev

Standard deviation computed from input EVI pixels

EVI 16-bit signed integer

-3000

0 to 10000

0.0001
CMG 0.05 Deg 16 days #1km pix used

Number of 1 km input pixels used

Pixels 8-bit unsigned integer

255

0 to 36

N/A
CMG 0.05 Deg 16 days #1km pix +-30deg VZ

Number of 1km pixels used with VZ angle less than + or - 30 degs

Pixels 8-bit unsigned integer

255

1 to 36

N/A
CMG 0.05 Deg 16 days pixel reliabilty

Quality reliability of VI pixel

Rank 8-bit signed integer

-1

0 to 4

N/A

 

 

Product Quality

The "CMG 0.05 Deg 16 days 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 QC layers.

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

 

Known Issues

For complete information about the MYD13C1 known issues please refer to the MODIS Land Quality Assessment website.

MYD13C1 V006 image

MYD13C1. Acquired April 23, 2009. Tile H11V05. Southeast US.

PI Name: 
Kamel Didan
Other Tools: 
Decommissioned: 
False