Landsat-8 TIRS radiometric calibration status

Julia A. Barsi; Brian L. Markham; Matthew Montanaro; Simon Hook; Nina G. Raqueno; Esad Micijevic; Kerry Cawse-Nicholson

doi:10.1117/12.2595527

19 August 2021 Landsat-8 TIRS radiometric calibration status

Julia A. Barsi, Brian L. Markham, Matthew Montanaro, Simon Hook, Nina G. Raqueno, Esad Micijevic, Kerry Cawse-Nicholson

Proceedings Volume 11829, Earth Observing Systems XXVI; 118290F (2021) https://doi.org/10.1117/12.2595527
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

The Landsat-8 Thermal Infrared Sensor (TIRS) has been acquiring two-band thermal infrared images of the Earth’s surface since 2013. The calibration of the two-band system has been monitored using the on-board calibrator and validated with vicarious calibration performed by NASA/Jet Propulsion Laboratory and Rochester Institute of Technology since launch. An update to the radiometric calibration was introduced into the Collection-2 processing system in late 2020 to correct for signal-dependent and time-dependent calibration errors. In November 2020, the Landsat-8 spacecraft experienced two safeholds and, while TIRS seemingly recovered nominally, there were slowly developing changes as a result. By December 2020, the TIRS Band 11 responsivity had decreased by as much as 2%. It was determined that a contaminant has been slowly depositing on a component in the optical path since the safehold and continues as of this writing. As of late June 2021, the responsivity is still decreasing in both spectral bands; Band 11 band-average responsivity has dropped by 3.7% and Band 10 band-average responsivity has dropped by 2.0%, though the decrease in responsivity is not uniform across the focal plane. Since March 2021, the TIRS products have been processed with calibration gains that account for the changing responsivity.

Conference Presentation

Citation Download Citation

Julia A. Barsi, Brian L. Markham, Matthew Montanaro, Simon Hook, Nina G. Raqueno, Esad Micijevic, and Kerry Cawse-Nicholson "Landsat-8 TIRS radiometric calibration status", Proc. SPIE 11829, Earth Observing Systems XXVI, 118290F (19 August 2021); https://doi.org/10.1117/12.2595527

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