[ISO_Topic_Category='IMAGERY/BASE MAPS/EARTH COVER']
ASTER On-Demand L2 Brightness Temperature at the SensorEntry ID: AST_04
Abstract: This product is discontinued.
The ASTER On-Demand L2 Brightness Temperature at the Sensor is an on-demand product generated using the five thermal infrared Bands between 8 and 12 µm. Brightness temperature is the apparent temperature of the imaged surface assuming a surface emissivity of 1.0 or that of a blackbody. However, this Brightness Temperature at Sensor product, as the name implies, ... entirely ignores atmospheric effects. The radiance at the sensor is the integral over the instrument response function of the emissivity, times the blackbody radiance. Spectral emissivity and temperature are the unknowns in this equation. The Brightness Temperature algorithm converts the radiance values in the L1B into corresponding brightness temperatures values by setting the emissivity to one (1), which is based on the assumption that the target is a blackbody. Brightness temperature is therefore defined as the temperature that a blackbody would be in order to produce the radiance perceived by the sensor. The output product is a five-band data set in units of degrees centigrade, scaled by a factor of 100. Brightness temperature is used, for instance, to observe volcanic ash clouds and also in detecting ice leads in the Arctic.
V002 data set release date: 2000-12-22
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: 7 Megabytes
Units: Centigrade (C◦)
Projection: Universal Transverse Mercator (UTM)
Data Format: HDF-EOS or GeoTiFF
Vgroup Data Fields: 5
(Click for Interactive Map)
Data Set Citation
Dataset Originator/Creator: Land Processes Distributed Active Archive Center (LP DAAC)
Dataset Title: ASTER On-Demand L2 Brightness Temperature at the Sensor
Dataset Release Date: 2000-12-22
Dataset Release Place: Sioux Falls, South Dakota, USA
Dataset Publisher: U.S. Geological Survey
Version: V002, V003Online Resource: https://lpdaac.usgs.gov/
Latitude Resolution: 90m
Longitude Resolution: 90m
Horizontal Resolution Range: 30 meters - < 100 meters
ISO Topic Category
Quality Sensor anomalies may be present.
Access Constraints This product has been discontinued.
Use Constraints None.
Data Set Progress
Role: DIF AUTHOR
Phone: +1 917 367 2467
Fax: +1 212 963 3742
Email: czaran at un.org
United Nations Secretariat Building UN Plaza
City: New York
Province or State: NY
Postal Code: 10017
Creation and Review Dates
Last DIF Revision Date: 2005-06-14
Future DIF Review Date: 2003-01-05