Another application, to earth resource exploration, will be 
explained next. In the field of resource exploration, 
features extracted from the shape of the earth surface are 
very important. One of them is a lineament which looks 
like a straight line on the earth surface. Lineaments often 
indicate the existence of faults. It is very important to 
extract as many lineaments as possible for the effective 
analysis. One experiment has been carried out to 
examine the relationship between B/H ratio of 
stereoscopic images and extractive lineaments. The 
experiment has been carried out at two test areas. One 1s 
the Izu peninsula in central Japan and the other is at 
Hishikari district in Kyusyu, southern Japan. 
Photo 8 and photo 9 are orthoimages of the Izu peninsula 
and the Hishikari district. Stereoscopic images of several 
B/H ratios have been made from these orthoimages using 
DEMs, and the experimental lineament extraction has 
been carried out using these stereoscopic images. Table 
  
Photo 8 Orthoimage of the Izu peninsula in Japan 
Table 10 The number of lineaments extracted from 
stereoscopic images of the Izu peninsula 
  
  
  
  
  
B/H Total number | Length (km) 
0.1 135 305. 86 
0.3 284 594.13 
0.5 330 730 10 
1.0 262 610. 36 
  
  
  
  
  
10 and table 11 show the number of lineaments extracted 
from the stereoscopic images of different B/H ratios. 
From these tables, some results can be extracted as 
follow: 
(1) The number of lineaments extracted differ greatly 
with the different B/H ratios of the stereoscopic images, 
Two times as many lineaments can be extracted in the 
best case as in the worst case. 
(2) The best B/H ratio for lineament extraction is not 
fixed. It seems to change according to the steepness of 
the earth surface. The mountains are very steep in the 
Izu peninsula but very gentle in the Hishikari district. 
It can be said from this experiment that the B/H ratio of 
stereoscopic images is very important for image analysis, 
and the most suitable B/H ratio changes with the 
landform of the area. It is a big advantage of this kind of 
system that stereoscopic images of any B/H ratio can be 
made easily and used effectiveiy in image analysis. 
  
Photo 9 Orthoimage of the Hishikari district in Kyusyu, 
southern Japan 
Table 11 The number of lineaments extracted from 
stereoscopic images of the Hishikari district 
  
  
  
  
  
  
B/H Total number | Length (km) 
0.1 18 152. 1? 
0.3 16 189.18 
0.5 103 249. 43 
1.0 164 309.58 | 
  
  
  
  
270 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B2. Vienna 1996 
  
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