Atmospheric compensation for imaging spectrometer systems with changing imaging geometry

Spectral radiance measurements in the solar reflective regime, which are obtained from downward looking space-based or airborne imaging spectrometer systems must be compensated for the influence of the atmosphere in order to retrieve earth surface reflectance spectra. The Fast Line-of-sight Atmospheric Analysis of Spectral Hypercubes (FLAASH) atmospheric correction code was updated with a new option to handle measurements from a new pushbroom sensor system having a continuously varying viewing geometry over an image scene. However, the new technique employed in FLAASH to handle this atmospheric compensation scenario does not explicitly account for the different viewing geometry values for each line in an image scene, which causes some error in the FLAASH retrievals. Simulated radiance cubes are used to gain a quantitative understanding of FLAASH retrieval errors due to viewing geometry errors.