NOAA-20 VIIRS operational radiometric calibration updates for the reflective solar bands

Taeyoung Choi; Slawomir Blonski; Xi Shao; Wenhui Wang; Sirish Uprety; Bin Zhang; Khalil Ahmad; Yan Bai

doi:10.1117/12.2633518

30 September 2022 NOAA-20 VIIRS operational radiometric calibration updates for the reflective solar bands

Taeyoung Choi, Slawomir Blonski, Xi Shao, Wenhui Wang, Sirish Uprety, Bin Zhang, Khalil Ahmad, Yan Bai

Proceedings Volume 12232, Earth Observing Systems XXVII; 122320Q (2022) https://doi.org/10.1117/12.2633518
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

The Visible Infrared Imaging Radiometer Suite (VIIRS) was successfully launched on November 18, 2017, onboard the National Oceanic and Atmospheric Administration-20 (NOAA-20) satellite. With its activation on November 28, 2017, VIIRS started producing Solar Diffuser (SD) observations and performing on-orbit radiometric calibration for accurate Sensor Data Records (SDRs). After the initial adjustment of the calibration coefficients called F-PREDICTED LUTs, the F-PREDICTED LUT has been set to a constant level for each detector in the Reflective Solar Bands (RSB) after April of 2018 because no noticeable degradation has been observed. Meanwhile, the NOAA VIIRS SDR team has been checking the validity of the F-PREDICTED LUT by comparing with the lunar calibration coefficients (F-factors), Deep Convective Cloud (DCC) trends. Recently, small but meaningful upward trends (indicative of responsivity degradation) were observed in some RSB F-factors and the NOAA-20 VIIRS F-PREDICTED LUT was updated to replace the current constant F-factors for M1-M6 and I1. The changes were based on the lunar calibration trends that were validated by the daily and monthly time series of DCC observations. The changes will smoothly mitigate the observed degradation in two years to provide the best radiometric calibration for the current VIIRS SDR products. By monitoring the lunar and DCC trends frequently, a follow-on update is expected when there is a significant long-term trend change between current F-PREDICTE LUT and lunar or DCC trends.

Conference Presentation

Citation Download Citation

Taeyoung Choi, Slawomir Blonski, Xi Shao, Wenhui Wang, Sirish Uprety, Bin Zhang, Khalil Ahmad, and Yan Bai "NOAA-20 VIIRS operational radiometric calibration updates for the reflective solar bands", Proc. SPIE 12232, Earth Observing Systems XXVII, 122320Q (30 September 2022); https://doi.org/10.1117/12.2633518

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available