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Proceedings of the Symposium on Global and Environmental Monitoring

D. Williams
Dept de génie électrique, Université de Sherbrooke,
Sherbrooke, Québec, Canada
O’Neill, N.T., A. Royer
Centre d’applications et de recherches in télédétection (CARTEL),
Université de Sherbrooke, Sherbrooke, Québec, Canada
Miller J.R., J. Freemantle
Centre for Research in Experimental Space Science (CRESS),
York University, Toronto, Ontario, Canada
Airborne imaging spectrometer data sets have been collected over several terrestrial sites accompanied by
simultaneous solar transmittance data or surface spectral reflectance characterization of several ground targets.
These data sets include multi-altitude images of a landfill sight and of Lake Ontario acquired by the
Fluorescence Line Imager (FLI), multi-altitude images of coastal sites collected by the Compact Airborne
Spectrographic Imager (CASI) over Baie des Chaleurs, Québec, and high altitude images acquired by NASA’s
Airborne Visible and Infrared Imaging Spectrometer (AVIRIS) over Jasper ridge in California and over
Whiteface Mountain, NY.
All data sets show contamination effects due to atmospheric scattering and absorption. The impact of the
atmosphere on the retrieved spectra is analyzed both in terms of extracting atmospheric optical information
and in terms of elimination this influence for purposes of deducing the ground surface reflectance. Results are
presented which demonstrate the influence of the atmospheric adjacency effect on spectral signatures in
transition regions between areas of low and high reflectance.