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Proceedings Paper

Operational calibration of VIIRS reflective solar band sensor data records
Author(s): Jason C. Cardema; Kameron W. Rausch; Ning Lei; David I. Moyer; Frank J. De Luccia
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Paper Abstract

The Visible-Infrared Imaging Radiometer Suite (VIIRS) is an instrument on-board the Suomi National Polar-orbiting Partnership (NPP) spacecraft, which launched on October 28, 2011. VIIRS performs measurements in 14 reflective solar bands (RSBs) spanning wavelengths from 412 nm to 2.25 um, which are calibrated by using solar radiance reflected from a Solar Diffuser (SD). The SD reflectance degrades over time, and a Solar Diffuser Stability Monitor (SDSM) is used to track the changes. The ratio between the calculated solar radiance reflected from the SD and the VIIRS measurement of this radiance using the pre-launch calibration coefficients is known as the “F factor.” The F factor is applied in the ground processing as a scale correction to the pre-launch calibration coefficients used to generate the calibrated radiances and reflectances comprising the Sensor Data Records (SDRs). The F factor is trended over time to track instrument response degradation. The equation for calculating expected solar radiance, and the coefficients used to convert the raw digital numbers measured by the detectors into radiance and reflectance values, are based on parameters stored in various Look-Up Tables (LUTs). This paper will discuss on-orbit RSB calibration for VIIRS, along with a description of the processing methodology, which includes operational LUT updates based on off-line calculations of F factor trending behavior.

Paper Details

Date Published: 15 October 2012
PDF: 6 pages
Proc. SPIE 8510, Earth Observing Systems XVII, 851019 (15 October 2012); doi: 10.1117/12.932221
Show Author Affiliations
Jason C. Cardema, The Aerospace Corp. (United States)
Kameron W. Rausch, The Aerospace Corp. (United States)
Ning Lei, Sigma Space Corp. (United States)
David I. Moyer, The Aerospace Corp. (United States)
Frank J. De Luccia, The Aerospace Corp. (United States)

Published in SPIE Proceedings Vol. 8510:
Earth Observing Systems XVII
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)

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