NOAA-20 VIIRS initial on-orbit radiometric calibration using scheduled lunar observations

Taeyoung Choi; Xi Shao; Slawomir Blonski; Wenhui Wang; Sirish Uprety; Changyong Cao

doi:10.1117/12.2528459

9 September 2019 NOAA-20 VIIRS initial on-orbit radiometric calibration using scheduled lunar observations

Taeyoung Choi, Xi Shao, Slawomir Blonski, Wenhui Wang, Sirish Uprety, Changyong Cao

Proceedings Volume 11127, Earth Observing Systems XXIV; 111271Z (2019) https://doi.org/10.1117/12.2528459
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

The scheduled lunar observations by the NOAA-20 VIIRS provide an independent source of calibration for the Reflective Solar Bands (RSB). Spacecraft roll maneuver is typically conducted to ensure that the moon observation is recorded at the Space View (SV) scan angle. VIIRS Earth View sector is shifted at the time of the lunar data collection to cover the SV scan angle and ensure spectral band co-registration. The lunar observation is performed monthly at nearly the same lunar phase angle with the exception of ~3-4 months each year. This paper analyzes scheduled lunar observations data from December 2017 to May 2019. For each lunar collection, the Global Space-based Inter-Calibration System (GSICS) Implementation of ROLO (GIRO) model is used to predict the expected lunar irradiance, and the ratio between the GIRO modeled and observed lunar irradiance is derived as the VIIRS lunar F-factor (or inverse of the gain factor). The lunar Ffactors are compared to the Solar Diffuser (SD) based F-factors that are used in the operational production of VIIRS Sensor Data Records (SDR) at NOAA. These two on-orbit calibration methods provide independent trending of the radiometric response degradations in the RSBs of VIIRS. In this paper, we present SD and lunar F-factor comparison results for NOAA-20 VIIRS RSBs.

Conference Presentation

Citation Download Citation

Taeyoung Choi, Xi Shao, Slawomir Blonski, Wenhui Wang, Sirish Uprety, and Changyong Cao "NOAA-20 VIIRS initial on-orbit radiometric calibration using scheduled lunar observations", Proc. SPIE 11127, Earth Observing Systems XXIV, 111271Z (9 September 2019); https://doi.org/10.1117/12.2528459

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