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24 June 2002 Comparisons between hyperspectral passive and multispectral active sensor measurements
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We conducted experiments with side-by-side active and passive sensors in the 8-12 micron region in order to study similarities and differences in the spectral signatures detected by the two sensors. The active instrument was a frequency-agile CO2 lidar system operating on 44 wavelengths and at a total pulse repetition rate of 5 kHz. The passive system was an Aerospace Corp. dispersive imaging spectrometer with 128 spectral channels from 750-1250 cm-l. The sensors viewed both natural scenes and man-made objects typical of industrial scenes at ranges of 1-3 km along horizontal paths. Scenes were viewed under various ambient conditions in order to evaluate the effects of radiance contrast for the passive images at different times of a day. Both imaging and 'staring' experiments were conducted on the background scenes with a significant level of 'clutter'. Preliminary analysis shows that reflectance data (from an active sensor) does not necessarily have a simple relationship to passive data, which is influenced by ground emissivity, atmospheric radiance, and temperature differences.
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Bernard R. Foy, Roger R. Petrin, Charles Robert Quick Jr., Tsutomu Shimada, and Joseph J. Tiee "Comparisons between hyperspectral passive and multispectral active sensor measurements", Proc. SPIE 4722, Chemical and Biological Sensing III, (24 June 2002);

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