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Proceedings Paper

The NASA OBPG 2020 on-orbit calibration of SNPP VIIRS for ocean color applications
Author(s): Robert E. Eplee Jr.; Gerhard Meister; Frederick S. Patt; Kevin R. Turpie; Sean W. Bailey; Bryan A. Franz
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Paper Abstract

The NASA Ocean Biology Processing Group (OBPG) has continued monitoring the SNPP VIIRS on-orbit calibration for bands M1-M11 over its mission to optimize the calibration for ocean color applications. The OBPG has recently implemented several changes to the calibration scheme: using solar-derived f-factors to detrend the lunar observations; using long-term exponentials of time as basis vectors (along with libration angles) for radiometric fits to any resulting lunar temporal drifts; deriving gain adjustments to the solar f-factors from these exponentials; and deriving gain adjustments due to modulated RSRs outside of the solar/lunar calibration using TOA reference spectra. These calibration changes minimize the impact of uncertainties in any one component of the calibration on the derived f-factors. The final f-factors incorporate VIIRS solar diffuser measurements, h-factor BRDF corrections, lunar-derived gains, and modulated RSR gains. The combined BRDF corrections, lunar gain adjustments, and mRSR gain adjustments define effective h-factors for each band. The improvements in the on-orbit calibration are validated by evaluation of globally-derived anomaly plots of remote sensing reflectance for the ocean color bands. The ultimate goal of the OBPG calibration effort is incorporation of a consistent SNPP VIIRS ocean color data set into the NASA multi-mission ocean color climate data record.

Paper Details

Date Published: 9 September 2019
PDF: 19 pages
Proc. SPIE 11127, Earth Observing Systems XXIV, 111271A (9 September 2019);
Show Author Affiliations
Robert E. Eplee Jr., NASA Goddard Space Flight Ctr. (United States)
Gerhard Meister, NASA Goddard Space Flight Ctr. (United States)
Frederick S. Patt, NASA Goddard Space Flight Ctr. (United States)
Kevin R. Turpie, NASA Goddard Space Flight Ctr. (United States)
Sean W. Bailey, Univ. of Maryland, Baltimore County (United States)
Bryan A. Franz, NASA Goddard Space Flight Ctr. (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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