Oblique In-Scene Atmospheric Compensation

This research introduces a novel oblique longwave infrared (LWIR) atmospheric compensation (AC) technique for hyperspectral imagery, oblique in-scene AC (OISAC). Current AC algorithms have been developed for nadir-viewing geometries, which assume that every pixel in the scene is affected by the atmo...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2022, Vol.60, p.1-15
Main Authors: O'Keefe, Daniel S., Nauyoks, Stephen N., Hawks, Michael R., Meola, Joseph, Gross, Kevin C.
Format: Article
Language:English
Subjects:
Algorithms
Alternating current
Atmosphere
Atmospheric compensation (AC)
Atmospheric measurements
Atmospheric modeling
Atmospheric waves
Blackbody
Compensation
Geometry
Hyperspectral imaging
Imagery
longwave infrared (LWIR)
oblique
off-nadir
Radiance
Temperature
Temperature sensors
Viewing
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Description
Summary:This research introduces a novel oblique longwave infrared (LWIR) atmospheric compensation (AC) technique for hyperspectral imagery, oblique in-scene AC (OISAC). Current AC algorithms have been developed for nadir-viewing geometries, which assume that every pixel in the scene is affected by the atmosphere in nearly the same manner. However, this assumption is violated in oblique imaging conditions where the transmission and path radiance vary continuously as a function of object-sensor range, negatively impacting current algorithms' ability to compensate for the atmosphere. The technique presented here leverages the changing viewing conditions to improve rather than hinder AC performance. An initial analysis of OISAC's ability to perform AC for both synthetic and measured hyperspectral images suggests improved performance in oblique-viewing conditions compared with standard techniques. OISAC is an extension of ISAC, a technique that has been used extensively for LWIR AC applications for over 20 years. OISAC has been developed to incorporate the range dependence of atmospheric transmission and path radiance in identification of the atmospheric state. Similar to the full implementation of ISAC, OISAC requires the existence of near-blackbody-like materials over the 11.73- \mu \text{m} water band.
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2022.3186676