Atmospheric Compensation of Extreme Off-Nadir Hyperspectral Imagery from Hyperion
SPECTRAL SCIENCES INC BURLINGTON MA
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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.
- Atmospheric Physics
- Computer Programming and Software
- Infrared Detection and Detectors