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Proceedings Paper

Measurement and modeling of longwave infrared directional downwelling spectral radiance
Author(s): Nathan P. Wurst; Joseph Meola; David L. Perry
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Paper Abstract

Exploitation of longwave infrared hyperspectral imagery often requires atmospheric compensation in order to retrieve intrinsic material emissivity properties. For materials possessing subtle spectral features and those with lower emissivity, downwelling radiance plays an important role in the atmospheric compensation process. Most atmospheric compensation algorithms use an estimate of the total downwelling radiance integrated over the hemisphere. However, for tilted surfaces and non-nadir imaging scenarios, directional downwelling radiance information may be required. This work examines collection of directional downwelling radiance measurements using a Fourier transform infrared spectrometer. Specifically, work is done to determine a minimum number of sky angles to measure for which the remainder of the directional sky measurements can be estimated with minimal error through the use of simple data fitting models.

Paper Details

Date Published: 1 September 2015
PDF: 11 pages
Proc. SPIE 9611, Imaging Spectrometry XX, 96110X (1 September 2015); doi: 10.1117/12.2186557
Show Author Affiliations
Nathan P. Wurst, Air Force Research Lab. (United States)
Joseph Meola, Air Force Research Lab. (United States)
David L. Perry, Leidos (United States)

Published in SPIE Proceedings Vol. 9611:
Imaging Spectrometry XX
Thomas S. Pagano; John F. Silny, Editor(s)

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