Landsat-7 ETM+ on-orbit reflective-band radiometric stability and absolute calibration

IEEE Transactions on Geoscience and Remote Sensing
By: , and 

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Abstract

Launched in April 1999, the Landsat-7 Enhanced Thematic Mapper Plus (ETM+) instrument is in its sixth year of operation. The ETM+ instrument has been the most stable of any of the Landsat instruments. To date, the best onboard calibration source for the reflective bands has been the Full Aperture Solar Calibrator, a solar-diffuser-based system, which has indicated changes of between 1% to 2% per year in the ETM+ gain for bands 1-4 and 8 and less than 0.5%/year for bands 5 and 7. However, most of this change is believed to be caused by changes in the solar diffuser panel, as opposed to a change in the instrument's gain. This belief is based partially on vicarious calibrations and observations of "invariant sites", hyperarid sites of the Sahara and Arabia. Weighted average slopes determined from these datasets suggest changes of 0.0% to 0.4% per year for bands 1-4 and 8 and 0.4% to 0.5% per year for bands 5 and 7. Absolute calibration of the reflective bands of the ETM+ is consistent with vicarious observations and other sensors generally at the 5% level, though there appear to be some systematic differences.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Landsat-7 ETM+ on-orbit reflective-band radiometric stability and absolute calibration
Series title IEEE Transactions on Geoscience and Remote Sensing
DOI 10.1109/TGRS.2004.836389
Volume 42
Issue 12
Year Published 2004
Language English
Publisher IEEE
Contributing office(s) Earth Resources Observation and Science (EROS) Center
Description 11 p.
First page 2810
Last page 2820
Online Only (Y/N) N
Additional Online Files (Y/N) N