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30 September 2022 S-NPP and NOAA-20 VIIRS day-night band on-orbit calibration and performance
H. Chen, C. Sun, D. Link, G. Sarid, J. Sun, X. Xiong
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Proceedings Volume 12232, Earth Observing Systems XXVII; 122320P (2022) https://doi.org/10.1117/12.2632310
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States
Abstract
The S-NPP and NOAA-20 VIIRS instruments have successfully operated since their launches on October 28, 2011 and November 18, 2017, respectively. A panchromatic channel onboard VIIRS is referred to as the day-night band (DNB), was designed with a large dynamic range and high sensitivity, such that its detectors can make observations during both daytime and nighttime. The DNB uses an onboard solar diffuser (SD) panel for low gain stage calibration, and the SD observations are also carefully selected to compute gain ratios between low-to-mid and mid-to-high gain stages. In this paper, we present the S-NPP and NOAA-20 VIIRS DNB calibration performed by the NASA VIIRS Characterization Support Team (VCST) to generate the calibration coefficient look up tables (LUTs) for the latest NASA Level 1B Collection 2 products. This activity supports the NASA Earth science community by delivering consistent VIIRS sensor data products via the Land Science Investigator-led Processing Systems. The DNB stray light contamination and its different behavior have been highlighted between two instruments. Its estimate and correction methods as well as performance are illustrated.
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H. Chen, C. Sun, D. Link, G. Sarid, J. Sun, and X. Xiong "S-NPP and NOAA-20 VIIRS day-night band on-orbit calibration and performance", Proc. SPIE 12232, Earth Observing Systems XXVII, 122320P (30 September 2022); https://doi.org/10.1117/12.2632310
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KEYWORDS
Sensors
Calibration
Contamination
Signal to noise ratio
Satellites
Diffusers
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