BARE SOIL WINTERWHEAT GRASS 
. 400 - . 440 
= mir rse 360 ^ 
240 + 2 de 
ds 
2407 eu x 2804 
\ 
160 , tpe N* 200 
AN 
N 
HPA 120 
0 1 P 40] 
A. + 
-80 + Nr mae -40 
. F7 
TTT Marre RTT TET 
-&0* -20" 0° 20° 40° -40° -20° 0° 20° 40° -40° -20° 0° 20° 460° 
  
Figure 2: Trendcorrected variances in channel 6 ---) and channel 9 € 
and covariance 6/9 C--.-), calculated in 10 scan angle ranges. 
) 
  
7 GRASS 
9 
3 -40° 
channel 
/ 
2 00- WINTER 
= WHEAT 
9 = / 
9 4804 a BARE 
„40° 
RE SOIL 
C 1604 i: 
- 40° 
  
  
  
  
| T 
| 
80 100 
I T = T T 
T Ka T T T I 2 I 
120 -< 140° 160- * 180 "200" 220 - 240 
grey level channel 6 
Figure 3: Variation of means and trendcorrected covariance matrices with scan angle. 
188 
To der 
the anc 
The me 
trendcc 
indicat 
some ol 
varies 1 
Conseq 
classifi 
which s 
3. DIR 
3.1 Re 
Therefo 
develop 
the clas 
d 
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and cov 
each cl 
and one 
not repr 
in some