Figure 2 . changes image ( 1976 - 1986 ) 
vegetation indices ( 1976 = red; 1986 = green ) 
  
ftmage: TM dn 17.05.86 & MSS dn 02.06.76) 
—g 
Legend 
zones of 
Changes 
non 
change 
S 
[.] 
Fel zones of 
b. 
  
  
Figure 3 . changes image ( 1976 - 1995 ) 
vegetation indices ( 1976- red; 1995 = green ) 
  
w 
Legend 
zones of 
Changes 
zones of 
non 
change 
  
  
  
  
682 Intemational Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998