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Proceedings Paper

VIIRS day/night band (DNB) stray light characterization and correction
Author(s): Stephen Mills; Stephanie Weiss; Calvin Liang
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Paper Abstract

The Day/Night Band (DNB) on the VIIRS sensor is a panchromatic band that can detect very dim nighttime scenes. After launch of Suomi NPP in October 2011 we observed a gray haze in radiance images with offsets up to 5×10-9 W cm-2 sr-1. Overall this impacts about 25% of nighttime scenes. We considered stray light as the likely cause, and studied calibration data from the space view. We concluded that stray light is likely entering the VIIRS scan cavity directly or indirectly through the nadir door and solar diffuser openings. We also studied the darkest earth scenes without any solar, lunar or artificial illumination, and found that the offset is a function of cross-track pixel, solar angle of incidence (AOI) and detector number. We observed a strong detector dependence causing striping. Dividing scenes into 3 or 4 zones in each hemisphere based on solar AOI, we devised an algorithmic correction based on polynomial fits of the medians of the data for each zone. The correction removed almost all the haze and striping and improved dynamic range by 2 orders-of-magnitude, to as low as 1×10-10 Wcm-2 sr-1, but some striping remains in the twilight region due to extrapolation.

Paper Details

Date Published: 23 September 2013
PDF: 18 pages
Proc. SPIE 8866, Earth Observing Systems XVIII, 88661P (23 September 2013); doi: 10.1117/12.2023107
Show Author Affiliations
Stephen Mills, Stellar Solutions, Inc. (United States)
Northrop Grumman Aerospace Systems (United States)
Stephanie Weiss, Northrop Grumman Aerospace Systems (United States)
Calvin Liang, Northrop Grumman Aerospace Systems (United States)

Published in SPIE Proceedings Vol. 8866:
Earth Observing Systems XVIII
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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