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Proceedings Paper

Lunar calibration and performance assessments of the NOAA-20 VIIRS reflective solar bands
Author(s): Amit Angal; Xiaoxiong Xiong; Truman Wilson; Xu Geng; Hongda Chen
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Paper Abstract

The Moon has played a vital role in the radiometric stability monitoring of NASAs Earth Observing System sensors, such as MODIS on the Terra and Aqua spacecrafts. The lunar calibration methodologies developed for the two MODIS instruments were later extended to apply to the VIIRS instrument on the Suomi-NPP spacecraft. The follow-on VIIRS instrument on the NOAA-20 (N20) spacecraft (previously JPSS-1) has been successfully operating since its launch in November 2017. Fifteen VIIRS spectral bands are in the reflective solar spectral region, covering wavelengths from 0.4 to 2.3 μm. Similar to the previous MODIS and VIIRS instruments, the N20 VIIRS views the Moon via a spacecraft roll maneuver on a near-monthly basis at a confined phase angle range (-51.5° to -50.5°) to facilitate radiometric stability monitoring with reduced uncertainties. In this paper, we briefly present the lunar calibration methodology and also report the derived instrument gain parameters from the regularly scheduled lunar calibrations. The USGS Robotic Lunar Observatory (ROLO) model is used to provide the predicted lunar irradiance for each lunar measurement to account for the variation in the observation geometry. The spatial characterization algorithms using the Moon, previously developed for MODIS and SNPP VIIRS, have also been extended to N20 VIIRS to track its on-orbit band-to-band registration (BBR).

Paper Details

Date Published: 9 September 2019
PDF: 8 pages
Proc. SPIE 11127, Earth Observing Systems XXIV, 111272B (9 September 2019); doi: 10.1117/12.2530024
Show Author Affiliations
Amit Angal, Science Systems and Applications, Inc. (United States)
Xiaoxiong Xiong, NASA Goddard Space Flight Ctr. (United States)
Truman Wilson, Science Systems and Applications, Inc. (United States)
Xu Geng, Science Systems and Applications, Inc. (United States)
Hongda Chen, Science Systems and Applications, Inc. (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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