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NOAA-20 VIIRS DNB straylight analysis and calibration before/after cryo-cooler door opening
Author(s): H. Chen; H. Oudrari; C. Sun; K. Chiang; X. Xiong
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Paper Abstract

The NOAA-20 VIIRS instrument has successfully operated since its launch on November 18, 2017. A panchromatic channel onboard VIIRS is referred to as the day-night band (DNB), which 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 its low gain stage calibration, and the SD observations are also carefully selected to compute the gain ratios between low-to-mid and mid-to-high gain stages. During certain view geometries, the DNB night image quality is severely affected by straylight contamination. Since the cryo-cooler door was opened, more accurate calibration has been derived for the DNB once the instrument has reached nominal operations. Post cryo-door opening, the calibrated radiance has significantly increased, indicating that the straylight impact has become larger, especially for the edge of scan samples. In this study, the DNB straylight impacts before and after opening the cryoradiator door have been analyzed and compared. Many different geological sites are selected for straylight evaluations from the northern and southern hemispheres. The DNB straylight correction algorithm is also discussed, and a special treatment is developed for correcting the large straylight feature seen on the edge of DNB images.

Paper Details

Date Published: 9 September 2019
PDF: 10 pages
Proc. SPIE 11127, Earth Observing Systems XXIV, 111271V (9 September 2019); doi: 10.1117/12.2528742
Show Author Affiliations
H. Chen, Science Systems and Applications, Inc. (United States)
H. Oudrari, Science Systems and Applications, Inc. (United States)
C. Sun, Global Science & Technology, Inc. (United States)
K. Chiang, Science Systems and Applications, Inc. (United States)
X. Xiong, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 11127:
Earth Observing Systems XXIV
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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