ABSTRACT 
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usually man 
spectrum. T 
content whi 
detecting o 
mineralizat 
INTRODUCTIO 
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resources h 
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important r 
the princip 
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of the futu 
and Canney, 
changes in 
known as ge 
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rapidly, or 
the naked e 
Remote sens 
nical pheno 
growth is r 
2) a change 
including b 
have been i 
1958 ; Cann 
and many st 
such as gig 
Wenderoth, 
This paper 
! of geobotan 
corres pond 
provide a f 
yy n i S d )9 ^51 H af "s 
= = r * i 
zu 8 j B os 
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