MYD09CMG v061

MODIS/Aqua Surface Reflectance Daily L3 Global 0.05 Deg CMG


PI: Eric Vermote

Historic processing continues for MODIS V6.1 data products for years 2011 through 2018. It is the intent to complete processing of the archive by the end of the 2021 calendar year. The V6 land products will be available until the V6.1 processing is completed, upon which time the MODIS V6 products will be decommissioned.

Description

The MYD09CMG Version 6.1 product provides an estimate of the surface spectral reflectance of Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) Bands 1 through 7, resampled to 5600 meter (m) pixel resolution and corrected for atmospheric conditions such as gasses, aerosols, and Rayleigh scattering. The MOD09CMG data product provides 25 layers including MODIS bands 1 through 7; Brightness Temperature data from thermal bands 20, 21, 31, and 32; along with Quality Assurance (QA) and observation bands. This product is based on a Climate Modeling Grid (CMG) for use in climate simulation models.

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Characteristics

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).

Product Maturity

Validation at stage 3 has been achieved for the MODIS Surface Reflectance products. Further details regarding MODIS land product validation for the MYD09 data product is available from the MODIS Land Team Validation site.

Collection and Granule

Collection

Characteristic Description
CollectionAqua MODIS
DOI10.5067/MODIS/MYD09CMG.061
File Size515 MB
Temporal ResolutionDaily
Temporal Extent2002-07-04 to Present
Spatial ExtentGlobal
Coordinate SystemGeographic Latitude and Longitude
DatumN/A
File FormatHDF
Geographic DimensionsGlobal

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers25
Columns/Rows7200 x 3600
Pixel Size5600 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
Coarse Resolution Surface Reflectance Band 1 Surface Reflectance Band 1 (620-670 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Coarse Resolution Surface Reflectance Band 2 Surface Reflectance Band 2 (841-876 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Coarse Resolution Surface Reflectance Band 3 Surface Reflectance Band 3 (459-479 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Coarse Resolution Surface Reflectance Band 4 Surface Reflectance Band 4 (545-565 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Coarse Resolution Surface Reflectance Band 5 Surface Reflectance Band 5 (1230-1250 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Coarse Resolution Surface Reflectance Band 6 Surface Reflectance Band 6 (1628-1652 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Coarse Resolution Surface Reflectance Band 7 Surface Reflectance Band 7 (2105-2155 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Coarse Resolution Solar Zenith Angle Solar Zenith Angle Degree 16-bit signed integer 0 N/A 1 to 18000 0.01
Coarse Resolution View Zenith Angle View Zenith Angle Degree 16-bit signed integer 0 N/A 1 to 18000 0.01
Coarse Resolution Relative Azimuth Angle Relative Azimuth Angle Degree 16-bit signed integer 0 N/A -18000 to 18000 0.01
Coarse Resolution Ozone Ozone Resolution cm atm 8-bit unsigned integer 0 N/A 1 to 255 0.0025
Coarse Resolution Brightness Temperature Band 20 Band 20 Brightness Temperature (3.360-3.840 μm) Kelvin 16-bit unsigned integer 0 N/A 1 to 40000 0.01
Coarse Resolution Brightness Temperature Band 21 Band 21 Brightness Temperature (3.929-3.989 μm) Kelvin 16-bit unsigned integer 0 N/A 1 to 40000 0.01
Coarse Resolution Brightness Temperature Band 31 Band 31 Brightness Temperature (10.780-11.280 μm) Kelvin 16-bit unsigned integer 0 N/A 1 to 40000 0.01
Coarse Resolution Brightness Temperature Band 32 Band 32 Brightness Temperature (11.770-12.270 μm) Kelvin 16-bit unsigned integer 0 N/A 1 to 40000 0.01
Coarse Resolution Granule Time Granule time of day Hours 16-bit signed integer 0 N/A 1 to 2355 N/A
Coarse Resolution Band 3 Path Radiance Band 3 Radiance N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Coarse Resolution QA Quality Assurance Bit Field 32-bit unsigned integer 0 N/A 1 to 1073741824 N/A
Coarse Resolution Internal CM Internal Cloud Mask Bit Field 16-bit unsigned integer 0 N/A 1 to 8191 N/A
Coarse Resolution State QA State Quality Assurance Bit Field 16-bit unsigned integer 0 N/A 1 to 65535 N/A
Coarse Resolution Number Mapping Number Mapping Cloud/Snow Bit Field 32-bit unsigned integer 0 N/A 1 to 2097151 N/A
number of 500m pixels averaged b3-7 Number of 500m pixels used in average N/A 16-bit unsigned integer 0 N/A 1 to 200 N/A
number of 500m rej. detector Number of 500m pixels rejected for use N/A 8-bit unsigned integer 0 N/A 1 to 100 N/A
number of 250m pixels averaged b1-2 Number of 250m pixels used in b1-2 average N/A 16-bit unsigned integer 0 N/A 1 to 640 N/A
n pixels averaged Number of pixels used in average N/A 8-bit unsigned integer 0 N/A 1 to 40 N/A

Product Quality

The Coarse Resolution QA, Internal CM, State QA, and Number Mapping layers are 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 these layers.

The bit flags for the Coarse Resolution QA, Internal CM, State QA, and Number Mapping layers are provided in the User Guide in Tables 10, 13, 14, and 15.

Known Issues

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


About the image

A global image of the MYD09CMG.061 data product from January 16, 2021.

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Documentation

User Guide
Algorithm Theoretical Basis Document (ATBD)
File Specification

Using the Data

Access Data

Citation

DOI: 10.5067/MODIS/MYD09CMG.061