AG5KMMOH v041

ASTER Global Emissivity Dataset, Monthly, 0.05 Degree, HDF5


PI: Glynn Hulley, Simon Hook

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Description

The Terra Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global Emissivity Dataset (GED) is a collection of monthly files (see known issues for gaps) for each year of global emissivity. The ASTER GED data products are generated for 2000 through 2015 using the ASTER Temperature Emissivity Separation (TES) algorithm atmospheric correction method. This algorithm method uses Moderate Resolution Imaging Spectroradiometer (MODIS) Atmospheric Profiles product MOD07 and the MODerate spectral resolution TRANsmittance (MODTRAN) 5.2 radiative transfer model along with the snow cover data from the standard monthly MODIS/Terra snow cover monthly global 0.05 degree product MOD10CM, and vegetation information from the MODIS monthly gridded NDVI product MOD13C2. ASTER GED Monthly V041 data products are offered in Hierarchical Data Format 5 (HDF5).

The National Aeronautics and Space Administration’s (NASA) Jet Propulsion Laboratory (JPL), California Institute of Technology, developed the ASTER GED product.

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Characteristics

Improvements/Changes from Previous Versions

  • The removal of the extraneous snow layer.
  • The optimized rows and columns for the data layers.
  • The updated SDS Attributes in the metadata for bounding coordinates.

The previous ASTER GED V004 product incorporated an emissivity adjustment to the V003 product. See “The ASTER Global Emissivity Dataset (ASTER GED): Mapping Earth’s emissivity at 100 meter spatial scale” publication Section 4 for more information.

Collection and Granule

Collection

Characteristic Description
CollectionASTER GED
DOI10.5067/Community/ASTER_GED/AG5KMMOH.041
File Size~340 MB
Temporal ResolutionMonthly
Temporal Extent2000-03-01 to 2015-12-31
Spatial ExtentGlobal
Coordinate SystemGeographic Latitude and Longitude
DatumWorld Geodetic System (WGS84)
File FormatHDF5
Geographic DimensionsGlobal

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers4
Columns/Rows7200 x 3600
Pixel Size5600 m

Layers / Variables

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
Emissivity Band 10 (8.3 μm)Band 11 (8.6 μm)Band 12 (9.1 μm)Band 13 (10.6 μm)Band 14 (11.3 μm) N/A 8-bit unsigned integer 0 N/A 1 to 255 0.002
Emissivity Uncertainty Band 10 (8.3 μm)Band 11 (8.6 μm)Band 12 (9.1 μm)Band 13 (10.6 μm)Band 14 (11.3 μm) N/A 8-bit unsigned integer 0 N/A 1 to 255 0.002
NDVI Normalized Difference Vegetation Index N/A 16-bit unsigned integer 0 N/A 0 to 65535 0.001
QFlag Quality Flag N/A 8-bit unsigned integer N/A N/A 0 to 255 N/A

Quality Flag Values

Value Description
0 Land
1 Filled Value
2 Ocean

Product Quality

Uncertainty information is available in the User Guide

Known Issues

Since ASTER GED Monthly V041 uses MOD10CM as an input, there will be some months that were unable to be created due to missing data. Please see the MODIS/Terra Data Outages Webpage for more information.


About the image

ASTER Global Emissivity Dataset band 10 data from the AG5KMMOH product across the globe, July 2015.

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Documentation

User Guide
Algorithm Theoretical Basis Document (ATBD)
ASTER Science Team (JPL) Website
Joint Emissivity Database Initiative (JEDI) Web Page

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Citation

DOI: 10.5067/Community/ASTER_GED/AG5KMMOH.041

When using this data product in a publication, please include the following citations in addition to the data product citation provided above:

Hulley, G.C., Hook, S.J., Abbott, E., Malakar, N., Islam, T., and Abrams, M., 2015, The ASTER Global Emissivity Dataset (ASTER GED)—Mapping Earth’s emissivity at 100 meter spatial scale: Geophysical Research Letters, accessed October 22, 2015, at https://doi.org/10.1002/2015GL065564.

Hulley, G.C., Hughes, C.G., and Hook, S.J., 2012, Quantifying uncertainties in land surface temperature and emissivity retrievals from ASTER and MODIS thermal infrared data: Journal of Geophysical Research D - Atmospheres, v. 117, no. 23, D23113, at https://doi.org/10.1029/2012JD018506.

Hulley, G.C., and Hook, S.J., 2011, Generating consistent land surface temperature and emissivity products between ASTER and MODIS data for earth science research: IEEE Transactions on Geoscience and Remote Sensing, v. 49, no. 4, p. 1304-1315, at https://doi.org/10.1109/TGRS.2010.2063034.

Hulley, G.C., and Hook, S.J., 2009, The North American ASTER Land Surface Emissivity Database (NAALSED) version 2.0: Remote Sensing of Environment, v. 113, no. 9, p. 1967-1975, at https://doi.org/10.1016/j.rse.2009.05.005.

Hulley, G.C., Hook, S.J., and Baldridge, A.M., 2009, Validation of the North American ASTER Land Surface Emissivity Database (NAALSED) version 2.0 using pseudo-invariant sand dune sites: Remote Sensing of Environment, v. 113, no. 10, p. 2224-2233, at https://doi.org/10.1016/j.rse.2009.06.005.

Hulley, G.C., and Hook, S.J., 2008, A new methodology for cloud detection and classification with ASTER data: Geophysical Research Letters, v. 35, no. 16, L16812, at https://doi.org/10.1029/2008GL034644.

Hulley, G.C., Hook, S.J., and Baldridge, A.M., 2008, ASTER land surface emissivity database of California and Nevada: Geophysical Research Letters, v. 35, no. 13, L13401, at https://doi.org/10.1029/2008GL034507.

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