Landsat-7 ETM+ radiometric calibration: Two years on-orbit

By: , and 



Landsat-7 has been in orbit for 2 years as of April 15, 2001 and operationally providing calibrated data products for 2 years as of June 28, 2001. A radiometric calibration team consisting of scientists and analysts from the Landsat Project Science Office, the Landsat-7 Image Assessment System and four universities evaluates the calibration based on on-board and ground-look (vicarious) calibration methodologies. The results are assembled and compared semi-annually and the calibration parameter files are adjusted as necessary. To date the combined results for the reflective bands have not shown any change from pre-launch values. The pre-launch values continue to be used for data processing, with the uncertainty estimated at less than 5%. In the thermal band, the vicarious calibration results indicated a 0.31 W/m/sup 2/ sr /spl mu/m bias in the calibration. This bias results in the ETM+ derived temperatures being about 3K high. The calibration parameter file was updated October 1, 2000 to remove this bias, however the U.S. Landsat Product Generation System (LPGS) software required modification that was not incorporated until December 20, 2000. All LPGS data products generated since this date have the correct thermal band calibration, regardless of image acquisition date, with uncertainties at approximately the 1% level.

Publication type Conference Paper
Publication Subtype Conference Paper
Title Landsat-7 ETM+ radiometric calibration: Two years on-orbit
DOI 10.1109/IGARSS.2001.976208
Year Published 2001
Language English
Publisher IEEE
Contributing office(s) Earth Resources Observation and Science (EROS) Center
Description 3 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title IGARSS 2001. Scanning the present and resolving the future. Proceedings.
First page 518
Last page 520
Conference Title IGARSS 2001. Scanning the Present and Resolving the Future
Conference Location Sydney, Australia
Conference Date Jul 9-13, 2001
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