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1 June 2005 The effects of atmospheric compensation upon gaseous plume signatures
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The usual first step in the processing of hyperspectral imagery is to remove the effects of the atmosphere. In the thermal region this usually involves accounting only for the upwelling radiance and the atmospheric transmission; the downwelling contribution being ignorable. This however can cause difficulties in the quantification of the gases if the atmosphere is improperly compensated for. Several algorithms exist for the compensation of the atmosphere including In-scene Atmospheric Compensation (ISAC) and Autonomous Atmospheric Correction (AAC). This study looks at which atmospheric compensation technique, if any, has the least negative impact on the gas signatures in the LWIR region (8-12 microns) using synthetic hyperspectral imagery created with the DIRSIG simulation. Two different metrics were used to this end: spectral angle and feature depth. Because the depth of the gas feature is directly related to the gas' concentration path length and temperature, it proved to be the more telling of the two. Results show that these atmospheric compensation routines have little effect in the strength of the gas features investigated here and, as such, atmospheric compensation may not be necessary.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Benjamin L. Miller and David W. Messinger "The effects of atmospheric compensation upon gaseous plume signatures", Proc. SPIE 5806, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XI, (1 June 2005);


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