Fig.6 
zimuth 
70.65°. 
9.14° 
2.68% 
age. b) 
  
  
5. TERRAIN'S INHOMOGEINITY TEST 
Two additional tests are realised, Fig.7, Fig.8, and they 
illustrate and confirm spatial inhomogenity of the terrain 
Fig.2a, selected for example in this work. 
AREA % VISIBLE BY SAR, H=4080 m 
  
  
  
  
1 ula A fi A A A A 
1 
1 1 
4 ^ 
0.95 4 F 
4 
$ 094 ; ; 
Bí 1 L 
0.85 4 F 
| [ 
1 
08 —— —À meme eee t 
0 $0 100 150 200 250 300 350 
AZIMUTH DEGREES 
Figure 7. The percentage of the area that could be seen by the SAR, from different azimuths of the SAR at altitude 4000 m, radius 
50 km. For the terrain Fig.2a. Minimum is achieved between 110 and 140 degrees. 
  
  
  
  
AREA % VISIBLE BY SAR 
y = -3.113+0.01*x+0.0001*x"2-4.615e-8*x"3+1 174e-11*x"4-1 055e-15*x"5+eps 
100 - ' T 
10 F " 
=, - ; 
Qu 4 
4 
LE 2 
; 
0 1000 2000 3000 4000 
ALTITUDE_M 
Figure 8. The percentage of the area that could be seen by SAR, on different altitudes, from point located on 0° azimuth, on the 
top of the terrain on Fig.2a. Points - obtained by the visibility analysis, thin line - the polinomial model. 
6. CONCLUSION airborne SAR route with minimum loss by shadows. The 
supervised classification of the relief *s aspect and slope 
Starting on general facts of the previous research on derived on DEM, enables finding the volume for SAR's 
mountainous terrain influence on imaging by SAR, an routes, within which foreslopes and backslopes of terrain 
approach was developed for the determination of the can be imaged. 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998 515