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Restoration of degraded Suomi-NPP VIIRS DNB nighttime imagery induced by electronic bias change
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2021
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Source: Earth Observing Systems XXVI, 8510, 28
[PDF-939.14 KB]
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Journal Title:Earth Observing Systems XXVI
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Description:Increased striping was observed in Suomi-NPP VIIRS DNB nighttime imagery after a flight software update on January 8, 2020. It occurred after an onboard computer reboot, resulting in a sudden change in the HGS dark offset. The sudden change made the HGS DN0 (dark offset) LUT outdated, eventually degrading the nighttime imagery. Analysis of the DNB monthly calibration data collected before and after the flight software update indicated that the sudden change in the HGS dark offset was induced by an unexpected change of the HGS electronic bias after an onboard computer reboot during the flight software update. An algorithm capable of correcting the sudden change while also eliminating star light contamination has been adopted for determining the DN0 LUT since the DNB monthly calibration starting in late January 2020. Nighttime image quality affected by the electronic bias change has been restored after the LUT update.
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Source:Earth Observing Systems XXVI, 8510, 28
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