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30 September 2022 Early radiometric performance of Landsat-9 Thermal Infrared Sensor
Julia A. Barsi, Matthew Montanaro, Kurtis Thome, Nina G. Raqueno, Simon Hook, Cody H. Anderson, Esad Micijevic
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Proceedings Volume 12232, Earth Observing Systems XXVII; 122320U (2022) https://doi.org/10.1117/12.2634058
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States
Abstract
Landsat-9, launched on September 27, 2021, carries the Thermal Infrared Sensor (TIRS). The Landsat-9 TIRS is a close copy of the Landsat-8 TIRS instrument; it is a two spectral-band, pushbroom sensor with three Sensor Chip Assemblies (SCAs) that cover the 15-degree field-of-view. The primary radiometric change between the instruments is the addition of baffling in the Landsat-9 TIRS telescope to mitigate the stray light issue that has impacted the radiometric quality of Landsat-8 TIRS. The on-orbit radiometric performance is monitored using the on-board variable temperature blackbody and views of deep space. Maneuvers to look at and around the moon have provided an assessment of the stray light. The absolute calibration is monitored by vicarious calibration techniques by teams at NASA/Jet Propulsion Lab and the Rochester Institute of Technology. Landsat-9 completed a three-month commissioning phase in January 2022 and has been operational since February 2022. The instrument has demonstrated excellent radiometric performance, as assessed from the on-orbit measurements. The TIRS instrument is radiometrically stable to 0.1% within a power cycle, and has noise levels below 0.1K. The lunar scans and the vicarious calibration data provide evidence that the stray light has been effectively mitigated.
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Julia A. Barsi, Matthew Montanaro, Kurtis Thome, Nina G. Raqueno, Simon Hook, Cody H. Anderson, and Esad Micijevic "Early radiometric performance of Landsat-9 Thermal Infrared Sensor", Proc. SPIE 12232, Earth Observing Systems XXVII, 122320U (30 September 2022); https://doi.org/10.1117/12.2634058
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KEYWORDS
Earth observing sensors
Landsat
Calibration
Stray light
Black bodies
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