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KEY W( 
ABSTR/ 
Image pr 
they prov 
Worldvie 
with avai 
of this re 
measurer 
relations] 
grass, a I 
imagery 
Accurate 
fundame 
producin 
recently, 
mainly 
operatioi 
particula 
measure: 
consider 
providec 
estimatic 
The init 
were ba: 
radiome 
Landsat 
increase 
optical 
1987; P 
followir 
expande 
spatial : 
Mishra 
2006; L 
Braman 
these pr 
(Congeı 
approac 
fast and 
depth c 
al., 200 
A wide 
evaluat 
statistic