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Proceedings Paper

Assessing the VIIRS RSB calibration stability using deep convective clouds
Author(s): Wenhui Wang; Changyong Cao
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Paper Abstract

This study investigates the VIIRS reflective solar bands (RSB) calibration stability using the Deep Convective Clouds (DCC) technique. DCC time series from March 2012 to August 2014 were developed for bands M1-M5 and M7. The mean and mode of the monthly probability distribution functions of DCC reflectance are used as two important indices in using DCC for calibration. The DCC mode time series, which are more stable than the mean time series, were chosen for calibration stability monitoring for individual bands. For bands M5 and M7, our results indicate that the operational radiometric calibration stabilities (1-sigma) are 0.3% and 0.4%, respectively, with variations (maximum – minimum) less than 1.3%. The stabilities of bands M1-M4 are 0.5% - 0.7%, with variations of 2% -3.5%. Larger fluctuations in bands M1-M3 monthly DCC reflectance were observed since early 2014, consistent with F-factor trend changes during this period. The DCC mean band ratio time series were used for inter-channel relative calibration stability monitoring. M1/M4, M2/M4, M3/M4, and M5/M7 time series reveal distinct band ratio patterns in 2013 compared to those in 2012. The DCC time series were also compared with the VIIRS validation site time series and VIIRS-MODIS simultaneous nadir overpass time series. Comparison results further support that the DCC time series are capable to detect sub-percent calibration changes in the visible and near-infrared spectrum.

Paper Details

Date Published: 19 November 2014
PDF: 11 pages
Proc. SPIE 9264, Earth Observing Missions and Sensors: Development, Implementation, and Characterization III, 926410 (19 November 2014); doi: 10.1117/12.2068434
Show Author Affiliations
Wenhui Wang, Earth Resource Technology, Inc. (United States)
Changyong Cao, STAR/NESDIS, National Oceanic and Atmospheric Administration (United States)

Published in SPIE Proceedings Vol. 9264:
Earth Observing Missions and Sensors: Development, Implementation, and Characterization III
Xiaoxiong Xiong; Haruhisa Shimoda, Editor(s)

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