7 May 2007 Atmospheric compensation of extreme off-nadir hyperspectral imagery from Hyperion
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Abstract
Compared to nadir viewing, off-nadir viewing of the ground from a high-altitude platform provides opportunities to increase area coverage and to reduce revisit times, although at the expense of spatial resolution. In this study, the ability to atmospherically compensate off-nadir hyperspectral imagery taken from a space platform was evaluated for a worst-case viewing geometry, using EO-1 Hyperion data collected with an off-nadir angle of 63° at the sensor, corresponding to six air masses along the line of sight. Reasonable reflectance spectra were obtained using both first-principles (FLAASH) and empirical (QUAC) atmospheric-compensation methods. Some refinements to FLAASH that enable visibility retrievals with highly off-nadir imagery, and also improve accuracy in nadir viewing, were developed and are described.
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Steven M. Adler-Golden, Larry S. Bernstein, Michael W. Matthew, Robert L. Sundberg, Anthony J. Ratkowski, "Atmospheric compensation of extreme off-nadir hyperspectral imagery from Hyperion", Proc. SPIE 6565, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XIII, 65651P (7 May 2007); doi: 10.1117/12.721769; https://doi.org/10.1117/12.721769
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