AG1km v003

ASTER Global Emissivity Dataset 1 kilometer 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) land surface temperature and emissivity (LST&E) data products are generated using the ASTER Temperature Emissivity Separation (TES) algorithm with a Water Vapor Scaling (WVS) atmospheric correction method using Moderate Resolution Imaging Spectroradiometer (MODIS) MOD07 atmospheric profiles and the MODerate Spectral resolution TRANsmittance (MODTRAN 5.2) radiative transfer model. This dataset is computed from all clear-sky pixels of ASTER scenes acquired from 2000 through 2008.

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

  • Includes data for the entire globe.
  • Includes the mean climatology of all ASTER data for the specific temporal extent.

Collection and Granule

Collection

Characteristic Description
CollectionASTER GED
DOI10.5067/Community/ASTER_GED/AG1km.003
File Size~0.5 MB
Temporal ResolutionOther
Temporal Extent2000-04-01 to 2008-12-31
Spatial ExtentGlobal
Coordinate SystemGeographic Latitude and Longitude
DatumWorld Geodetic System (WGS84)
File FormatHDF5
Geographic Dimensions1 degree lat x 1 degree lon

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers11
Columns/Rows1000 x 1000
Pixel Size1 km

Layers / Variables

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
ASTER GDEM ASTER Global Digital Elevation Model V002 Meters 16-bit signed integer -9999 N/A -500 to 9000 N/A
Emissivity Mean Emissivity Mean for Band 10 (8.3 μm), Band 11 (8.6 μm), Band 12 (9.1 μm), Band 13 (10.6 μm) and Band 14 (11.3 μm) N/A 16-bit signed integer -9999 N/A 0 to 1000 0.001
Emissivity SDev Emissivity Standard Deviation for Bands 10 to 14 N/A 16-bit signed integer -9999 N/A -1000 to 1000 0.0001
Latitude Latitude Degree 32-bit floating point N/A N/A -90 to 90 N/A
Longitude Longitude Degree 32-bit floating point N/A N/A -180 to 180 N/A
Land Water Map Land Water Map N/A 16-bit signed integer N/A N/A 0 land, 1 water N/A
NDVI Mean NDVI Mean N/A 16-bit signed integer -9999 N/A 0 to 100 0.01
NDVI SDev NDVI Standard Deviation N/A 16-bit signed integer -9999 N/A 0 to 100 0.01
Observations Number of Observations per pixel N/A 16-bit signed integer N/A N/A N/A N/A
Temperature Mean Temperature Mean Kelvin 32-bit signed integer -9999 N/A 0 to 65535 0.01
Temperature SDev Temperature Standard Deviation Kelvin 16-bit signed integer -9999 N/A 0 to 65535 0.01

Fill Values of -9999 are assigned to missing or cloudy data. (add footnote to Fill Value header)

Product Quality

Product quality information can be found in the User Guide.

Known Issues

Known issues are provided in Section 4, starting on page 8 of the User Guide.


About the image

ASTER Global Emissivity Dataset band 10 data from the AG1km product over Bedourie, Australia.

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Documentation

User Guide
ASTER Science Team (JPL) Website
Joint Emissivity Database Initiative (JEDI) Web Page

Using the Data

E-Learning

Data Citation Tips from NASA’s Land Processes DAAC

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DAAC2Disk Utility Direct Download The LP DAAC2Disk download manager allows users to simplify the search and HTTPS download process of…

Citation

DOI: 10.5067/Community/ASTER_GED/AG1km.003

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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