International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part Bl. Istanbul 2004 
  
  
  
  
  
  
  
  
  
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Figure 1.2. Histogram of the source SPOT-5 stereopair over 
Rasht, Iran (right image) 
After performing of this procedure there appeared terrain 
features hidden from the eye on the source image. This allowed 
to start the real process of DEM production. 
  
Figure2.1. Stretched source SPOT-5 stereo images (left image) 
As source materials for production of the second DEM over the 
test area TK-350 satellite stereo images were used. After their 
scanning on UltraScan 5000 scanner the dynamic range of 
optical densities of images appeared to be about 256 grayscale 
levels. 
  
Figure 2.2. Stretched source SPOT-5 stereo images (right 
image) 
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Figure 3. Histogram of source images of TK-350 stereo pair 
over Rasht, Iran 
  
  
   
  
   
    
   
   
    
   
   
    
     
     
    
    
    
   
  
  
  
     
  
   
  
   
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