147 
Soil Reflectances; Sun = 30 & 60; View= 0 
26 soils 
Figure 2: 
Relationship between 
near-infrared and 
visible reflectances 
for 26 bare soils. 
(Data from Baret et al., 
1993). 
Figure 4: 
The simplified TSAVI, 
for the 2 groups of soils 
and as a function of 
vegetation cover. 
Figure 3: 
Comparison between the 
dispersion of Vis values 
from their average. 
Vl-Standard Deviation ; Sun= 45 ; View= 0 ; 26 soils 
S-TSAVI ; Sun = 45 ; View= 0 ; 24 soils