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This research not only builds directly upon the work conducted 
by Smith et al. (2004) but also that of Zarco-Tejada et al. (2003) 
who identified double peak red-edge effects of californium 
canopies using plant fluorescence detection techniques. 
Moreover, this paper provides further application of the double 
peak red-edge feature identified by Smith et al. (2004) and 
Zarco-Tejada et al. (2003) to infer sub-surface soil disturbance 
and has wider application areas beyond soil disturbance 
including archaeology, geophysics and forensic science. 
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ACKNOWLEDGEMENTS 
The authors wish to thank the following: Engineering and 
Physical Sciences Research Council and Shell International 
Exploration and Production, Rijswijk, The Netherlands, for 
funding the industrial CASE PhD studentship; the School of 
Civil Engineering and Geosciences, Newcastle University, for 
providing funds for the emergency NERC ARSF acquisition of 
CASI-2 and ATM imagery at such short notice in 2004; NERC 
FSF for calibration of the ASD spectroradiometer; NERC BIGF 
for providing archived GPS data; local farmers for access to 
their land and crops; and everyone involved in assisting with 
field data acquisition.