Correction of NOAA-20 VIIRS day/night band low-gain stage gain calibration errors by scaling factors derived from prelaunch testing data

Yalong Gu; Slawomir Blonski; Wenhui Wang; Taeyoung Choi; Sirish Uprety; Xi Shao; Changyong Cao

doi:10.1117/12.2568783

20 August 2020 Correction of NOAA-20 VIIRS day/night band low-gain stage gain calibration errors by scaling factors derived from prelaunch testing data

Yalong Gu, Slawomir Blonski, Wenhui Wang, Taeyoung Choi, Sirish Uprety, Xi Shao, Changyong Cao

Author Affiliations +

Proceedings Volume 11501, Earth Observing Systems XXV; 115010Y (2020) https://doi.org/10.1117/12.2568783
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

The operational VIIRS Day/Night Band (DNB) Low Gain Stage (LGS) gain is calibrated by the onboard solar diffuser when it is fully illuminated by the Sun. Such calibration method relies on assumption of the same calibrator view and Earth view responses of the LGS. However, analysis of the NOAA-20 VIIRS DNB prelaunch testing data shows this assumption is not valid for all aggregation modes and detectors, consequently yielding striping in NOAA-20 VIIRS DNB daytime images collected by its LGS. Through applying scaling factors derived from the prelaunch testing data, the operational LGS gain calibration errors are corrected and striping in the reprocessed DNB daytime images is reduced.

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Yalong Gu, Slawomir Blonski, Wenhui Wang, Taeyoung Choi, Sirish Uprety, Xi Shao, and Changyong Cao "Correction of NOAA-20 VIIRS day/night band low-gain stage gain calibration errors by scaling factors derived from prelaunch testing data", Proc. SPIE 11501, Earth Observing Systems XXV, 115010Y (20 August 2020); https://doi.org/10.1117/12.2568783

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