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Proceedings Paper

Initial assessment of radiometric performance of N20 VIIRS reflective solar bands using vicarious approaches
Author(s): A. Wu; T. Chang; X. Xiong; C. Cao
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Paper Abstract

The newly launched (November 18, 2017) polar-orbiting satellite of the Joint Polar Satellite System (JPSS-1), now transitioned to NOAA-20, is the follow-on mission to the SNPP (Suomi National Polar-orbiting Partnership) satellite, launched six years ago. NOAA-20 leads SNPP by a half orbit or about 50 minutes. The Visible Infrared Imaging Radiometer Suite (VIIRS) is a key sensor onboard both NOAA-20 and SNPP spacecraft with nearly identical band spectral responses. Similar to the heritage sensor MODIS, VIIRS has on-board calibration components including a solar diffuser (SD) and a solar diffuser stability monitor (SDSM) for the reflective solar bands (RSB), a V-groove blackbody for the thermal emissive bands (TEB), and a space view (SV) as background reference for calibration. This study provides an initial assessment of calibration of the NOAA-20 VIIRS reflective solar bands (RSB) by intercomparison with measurements from SNPP VIIRS using various vicarious approaches. The first approach is based on a double difference method using observations from simultaneous nadir overpasses (SNO) with Aqua MODIS. The second is from the collected reflectances over the widely used Liby-4 desert site from 16-day repeatable orbits so each data point has the same viewing geometry relative to the site. The third approach is to use the frequent overpasses over the Dome C snow site. Results of this study provide useful information on NOAA-20 VIIRS post-launch calibration assessment and preliminary analysis of its calibration stability and consistency for the first 6 months.

Paper Details

Date Published: 13 November 2018
PDF: 12 pages
Proc. SPIE 10781, Earth Observing Missions and Sensors: Development, Implementation, and Characterization V, 107810W (13 November 2018); doi: 10.1117/12.2324756
Show Author Affiliations
A. Wu, Science Systems and Applications, Inc. (United States)
T. Chang, Science Systems and Applications, Inc. (United States)
X. Xiong, NASA Goddard Space Flight Ctr. (United States)
C. Cao, NOAA/NESDIS/STAR (United States)

Published in SPIE Proceedings Vol. 10781:
Earth Observing Missions and Sensors: Development, Implementation, and Characterization V
Xiaoxiong Xiong; Toshiyoshi Kimura, Editor(s)

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