Science Keywords>LAND SURFACE
ASTER On-Demand L2 EmissivityEntry ID: AST_05
Abstract: The ASTER On-Demand L2 Surface Emissivity is an on-demand product generated using the five thermal infrared (TIR) Bands (acquired either during the day or night time) between 8 and 12 µm spectral range. It contains surface emissivity over the land at 90 meters spatial resolution. Estimates of surface emissivity were thus far only derived using surrogates such as land-cover type or vegetation ... index. The Temperature/Emissivity Separation (TES) algorithm is used to derive both E (emissivity) and T (surface temperature). The main goals of the TES algorithm include: recovering accurate and precise emissivities for mineral substrates, and estimating accurate and precise surface temperatures especially over vegetation, water and snow.
The TES algorithm is executed in the ASTER processing chain following generation of ASTER Level-2 Surface Radiance (TIR). The land-leaving radiance and down-welling irradiance vectors for each pixel are taken in account. Emissivity is estimated using the Normalized Emissivity Method (NEM), and is iteratively compensated for reflected sunlight. The emissivity spectrum is normalized using the average emissivity of each pixel. The minimum-maximum difference (MMD) of the normalized spectrum is calculated and estimates of the minimum emissivity derived through regression analysis. These estimates are used to scale the normalized emissivity and compensate for reflected skylight with the derived refinement of emissivity.
V002 data set release date: 2001-04-09
V003 data set release date: 2002-05-03
The key determinants between these versions are the use of a newer algorithm with an improved set of radiometric calibration and geometric correction coefficients databases in version 003.
Data Set Characteristics
Area: ~ 60 km x 60 km
Image Dimensions: 700 rows x 830 columns
File Size: ~9 Megabytes
Projection: Universal Transverse Mercator (UTM)
Data Format: HDF-EOS
Vgroup Data Fields: 5
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Data Set Citation
Dataset Originator/Creator: Land Processes Distributed Active Archive Center (LP DAAC)
Dataset Title: ASTER On-Demand L2 Surface Emissivity
Dataset Release Date: 2001-01-09
Dataset Release Place: Sioux Falls, South Dakota, USA
Dataset Publisher: U.S. Geological Survey
Version: V002, V003Online Resource: https://lpdaac.usgs.gov
Start Date: 2000-03-12
Latitude Resolution: 90m
Longitude Resolution: 90m
Horizontal Resolution Range: 30 meters - < 100 meters
Quality Sensor anomalies may be present.
Access Constraints None.
Use Constraints None.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 9 MB
Distribution Format: HDF-EOS, GeoTIFF
Role: TECHNICAL CONTACT
Phone: (Toll Free) (866) 573-3222
Phone: (605) 594-6116
Fax: (605) 594-6963
Email: LPDAAC at usgs.gov
LP DAAC User Services U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center 47914 252nd Street
City: Sioux Falls
Province or State: SD
Postal Code: 57198-0001
Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) publication references: [available online at http://asterweb.jpl.nasa.gov/asterbiblio20120719.pdf]
National Aeronautics and Space Administration, revised 2006, EOS Reference Handbook, a Guide to NASA's Earth Science Enterprise and the Earth Observing System: Greenbelt, Maryland, Goddard Space Flight Center, 261 p. [available online in pdf format at http://eospso.gsfc.nasa.gov/sites/default/files/publications/2006Re...].
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2002-08-05
Last DIF Revision Date: 2013-08-26