NOAA-20 VIIRS DNB straylight analysis and calibration before/after cryo-cooler door opening

H. Chen; H. Oudrari; C. Sun; K. Chiang; X. Xiong

doi:10.1117/12.2528742

9 September 2019 NOAA-20 VIIRS DNB straylight analysis and calibration before/after cryo-cooler door opening

H. Chen, H. Oudrari, C. Sun, K. Chiang, X. Xiong

Proceedings Volume 11127, Earth Observing Systems XXIV; 111271V (2019) https://doi.org/10.1117/12.2528742
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

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.

Conference Presentation

Citation Download Citation

H. Chen, H. Oudrari, C. Sun, K. Chiang, and X. Xiong "NOAA-20 VIIRS DNB straylight analysis and calibration before/after cryo-cooler door opening", Proc. SPIE 11127, Earth Observing Systems XXIV, 111271V (9 September 2019); https://doi.org/10.1117/12.2528742

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