688 
Figure 4. Image representation of the 4 sub-frames analysed in relation to the hand Infrared and respective 
hand ratios. The discrete grey scale at 8 levels on the right is the reference scale for NDVI images. 
Table 5. Values of statistical parameters concerning to the hase colour components Green, Red and Infrared and 
to hand ratios of the 4 sub-frame set. Arithm. Mean = m, Standard Deviation = a and Skewness Coeff. = s. 
Sites 
Statistical 
parameters 
Green 
Red 
IR 
IR/Red 
IR/Green 
NDVI 
GIRISONDOLA 1 
m 
149 
108 
165 
157 
77 
148 
077-1 Gl 
a 
21 
24 
16 
26 
8 
8 
s 
0.02 
0.24 
-0.08 
-0.27 
-0.35 
-0.l6 
GIRISONDOLA 2 
m 
130 
86 
147 
177 
80 
154 
077-E G2 
a 
28 
29 
24 
37 
15 
13 
s 
0.51 
0.36 
0.72 
2.09 
-0.31 
-0.6 
LAGONI 
m 
124 
85 
148 
180 
126 
157 
035~E LG 
a 
36 
34 
24 
43 
34 
18 
s 
0.37 
0.03 
0.19 
1.73 
3.7 
-0.54 
P0GGI0 MAURICCIA 
m 
109 
73 
l4i 
197 
132 
160 
101-E,I MA 
a 
22 
22 
l4 
36 
23 
12 
s 
0.4l 
0.26 
0.35 
1.6 
-0.52 
-0.49 
115i 
*»- 
M 
220- 
200 
tto- 
60 
40- 
20- 
0- 
Figure 5. ■ 
from the m- 
a) Gl, h) ' 
Numbers. 
We remark 
subframes i 
the mean r< 
This fac 
response i: 
zone LG am 
surveys im 
most zero. 
Moreover 
area, sine 
same time 
On the o' 
ghest refli 
related to 
eked. 
The aritl 
correlated 
We remar] 
frames kee] 
spots selec 
the mean v; 
0.15 and 0 
in the gre; 
Moreover 
mean value: 
on the com 
res shown : 
me. That m< 
minating p< 
spectral s: 
In partit 
in both ra1 
sents the ! 
to the has: 
tion is sul 
uids.