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This paper briefly reviews the current status of spectral 
characterization of areas of mine tailings and provides several 
examples on the use of air photos, airborne multispectral 
techniques, thermal images and multi-date TM to characterize and 
monitor hazardous waste sites.. 
ACKNOWLEDGMENTS 
The examples described in the paper have been carried out in 
collaboration with BGR and CCRS collegues. Franz Boker 
(BGR Hannover) has provided technical supports and 
organized the thermal and airphoto flights. Historic air 
photographs have been provided by the Luftbilddatenbank in 
Würzburg, Germany. Robert St. Jean has done the image 
processing of the Sudbury images. 
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International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996