Evaluation and correction of NOAA-21 VIIRS day night band stray light and comparison with SNPP and NOAA-20

Xi Shao; Tung-Chang Liu; Slawomir Blonski; Sirish Uprety; Taeyoung Choi

doi:10.1117/12.2677363

4 October 2023 Evaluation and correction of NOAA-21 VIIRS day night band stray light and comparison with SNPP and NOAA-20

Xi Shao, Tung-Chang Liu, Slawomir Blonski, Sirish Uprety, Taeyoung Choi

Author Affiliations +

Proceedings Volume 12685, Earth Observing Systems XXVIII; 1268513 (2023) https://doi.org/10.1117/12.2677363
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

NOAA-21 satellite was successfully launched on November 10, 2023 and joins the SNPP and NOAA-20 missions under NOAA Joint Polar Satellite System (JPSS) to provide continuation of Earth system observations. The Visible Infrared Imaging Radiometer Suite (VIIRS) instruments onboard the SNPP, NOAA-20 and NOAA-21 satellites provide sustained long-term Earth observation data accumulating to over a decade. The unique VIIRS Day/Night Band (DNB) observations particularly have a wide range of applications such as geophysical and socio-economic studies and natural disaster assessment. As learned from SNPP and NOAA-20 DNB, there was stray light over high latitude regions (with spacecraft solar zenith angle less than 118.4 degree) in DNB images over both northern and southern hemispheres. Efforts in prelaunch preparation have been devoted to reducing NOAA-21 DNB stray light. The post-launch assessment indicates that there are traces of stray light in the NOAA-21 DNB image, but with a significant reduction in stray light magnitude in comparison with both SNPP and NOAA-20 DNB. This paper presents the development and application of stray light correction for NOAA-21 DNB. Furthermore, the spatial distribution and magnitude of DNB stray light of NOAA-21 are assessed and compared with SNPP and NOAA-20. DNB images with no major artificial or auroral lights over the northern and southern hemispheres on new moon days are selected for comparison. It is found that NOAA-21 DNB stray light over both hemispheres is reduced by ~40 to 60% (depending on the along scan zone) in comparison with NOAA-20 DNB, which confirms the effectiveness of the prelaunch efforts in reducing the NOAA-21 DNB stray light.

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(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xi Shao, Tung-Chang Liu, Slawomir Blonski, Sirish Uprety, and Taeyoung Choi "Evaluation and correction of NOAA-21 VIIRS day night band stray light and comparison with SNPP and NOAA-20", Proc. SPIE 12685, Earth Observing Systems XXVIII, 1268513 (4 October 2023); https://doi.org/10.1117/12.2677363

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