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Description

The MYD09CMG Version 6 data product was decommissioned on July 31, 2023. Users are encouraged to use the MYD09CMG Version 6.1 data product.

The MYD09CMG Version 6 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.

Known Issues

  • The Collection 6 MODIS Land Surface Reflectance product (MYD09) may incorrectly flag retrievals as ‘High Aerosol’ over brighter surfaces and at higher view angles. This will impact the downstream MODIS BRDF/Albedo (MCD43) and Vegetation Index (MOD13 and MYD13) data products which use the aerosol quantity flag to screen out high aerosol values.
  • Corrections were implemented in Collection 6.1 reprocessing.
  • For complete information about known issues please refer to the MODIS/VIIRS Land Quality Assessment website.

Improvements/Changes from Previous Versions

  • Improvements to the aerosol retrieval and correction algorithm along with new aerosol retrieval look-up tables.
  • Refinements to the internal snow, cloud, and cloud shadow detection algorithms. Uses Bidirectional Reflectance Distribution Function (BRDF) database to better constrain the different threshold used.
  • Processes ocean bands to create a new Surface Reflectance Ocean product and provides QA sets data for these bands.
  • Improved discrimination of salt pans from cloud and snow, along with the inclusion of a salt pan flag in the QA band.

Version Description

The MYD09CMG Version 6 data product was decommissioned on July 31, 2023. Users are encouraged to use the MYD09CMG Version 6.1 data product (https://doi.org/10.5067/MODIS/MYD09CMG.061).

Product Summary

Platforms
Aqua
Instruments
MODIS
Spatial Extent
N: 90 S: -90 E: 180 W: -180
Spatial Resolution
5600 Meters x 5600 Meters
Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2002-07-04 to 2023-02-25
Temporal Resolution
1 Day
Data Partner
Land Processes Distributed Active Archive Center (LP DAAC)
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)
Concept ID
C2763370200-LPCLOUD
Data State
DEPRECATED
Processing Level
3
Published
Updated
Science Keywords
Reflectance

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.

Copy Citation

Vermote, E. (2015). MYD09CMG MODIS/Aqua Surface Reflectance Daily L3 Global 0.05Deg CMG V006 [Data set]. NASA Land Processes Distributed Active Archive Center. https://doi.org/10.5067/MODIS/MYD09CMG.006 Date Accessed: 2025-11-04

File Naming Convention

MYD09CMG.A2002281.006.2015151135907.hdf

The file name begins with the Product Short Name (MYD09CMG) followed by the Julian Date of Acquisition formatted as AYYYYDDD (A2002281), the Version of the data collection (006), the Julian Date and Time of Production designated as YYYYDDDHHMMSS (2015151135907), and the Data Format (hdf).

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Publications Citing This Dataset

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Evaluation of BRDF information retrieved from time-series multiangle data of the Himawari-8 AHI Zhang, X. N.
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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 Description Units Data Type Fill Value Valid Range Scale Factor
Coarse Resolution Band 3 Path Radiance Band 3 Radiance N/A int16 -28672 -28672 to 16000 0.0001
Coarse Resolution Brightness Temperature Band 20 Band 20 Brightness Temperature (3.360-3.840 μm) Kelvin uint16 0 0 to 40000 0.01
Coarse Resolution Brightness Temperature Band 21 Band 21 Brightness Temperature (3.929-3.989 μm) Kelvin uint16 0 0 to 40000 0.01
Coarse Resolution Brightness Temperature Band 31 Band 31 Brightness Temperature (10.780-11.280 μm) Kelvin uint16 0 0 to 40000 0.01
Coarse Resolution Brightness Temperature Band 32 Band 32 Brightness Temperature (11.770-12.270 μm) Kelvin uint16 0 0 to 40000 0.01
Coarse Resolution Granule Time Granule time of day Hours int16 0 0 to 2355 N/A
Coarse Resolution Internal CM Internal Cloud Mask Bit Field uint16 0 0 to 8191 N/A
Coarse Resolution Number Mapping Number Mapping Cloud/Snow Bit Field uint32 0 0 to 2097151 N/A
Coarse Resolution Ozone Ozone Resolution cm atm uint8 0 0 to 255 0.0025
Coarse Resolution QA Quality Assurance Bit Field uint32 0 0 to 1073741824 N/A
Coarse Resolution Relative Azimuth Angle Relative Azimuth Angle Degree int16 0 0 to 18000 0.01
Coarse Resolution Solar Zenith Angle Solar Zenith Angle Degree int16 0 0 to 18000 0.01
Coarse Resolution State QA State Quality Assurance Bit Field uint16 0 0 to 65535 N/A
Coarse Resolution Surface Reflectance Band 1 Surface Reflectance Band 1 (620-670 nm) N/A int16 -28672 -28672 to 16000 0.0001
Coarse Resolution Surface Reflectance Band 2 Surface Reflectance Band 2 (841-876 nm) N/A int16 -28672 -28672 to 16000 0.0001
Coarse Resolution Surface Reflectance Band 3 Surface Reflectance Band 3 (459-479 nm) N/A int16 -28672 -28672 to 16000 0.0001
Coarse Resolution Surface Reflectance Band 4 Surface Reflectance Band 4 (545-565 nm) N/A int16 -28672 -28672 to 16000 0.0001
Coarse Resolution Surface Reflectance Band 5 Surface Reflectance Band 5 (1230-1250 nm) N/A int16 -28672 -28672 to 16000 0.0001
Coarse Resolution Surface Reflectance Band 6 Surface Reflectance Band 6 (1628-1652 nm) N/A int16 -28672 -28672 to 16000 0.0001
Coarse Resolution Surface Reflectance Band 7 Surface Reflectance Band 7 (2105-2155 nm) N/A int16 -28672 -28672 to 16000 0.0001
Coarse Resolution View Zenith Angle View Zenith Angle Degree int16 0 0 to 18000 0.01
n pixels averaged Number of pixels used in average N/A uint8 0 0 to 40 N/A
number of 250m pixels averaged b1-2 Number of 250m pixels used in b1-2 average N/A uint16 0 0 to 640 N/A
number of 500m pixels averaged b3-7 Number of 500m pixels used in average N/A uint16 0 0 to 200 N/A
number of 500m rej. detector Number of 500m pixels rejected for use N/A uint8 0 0 to 100 N/A
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