Map 
Maps with contours are used to make a digital terrain model 
(DTM) . In this work we used maps of 1:50,000 scale. The 
contours of the map are converted to a digital image by 
drum-scanner. 
DTM 
DTM. with 198.3 m interval is made from the digital image of 
contours using computer. But the height information of each 
contour must be attached line by live manually. 
Orthophoto image 
A digital image of a photograph is converted to an orthophoto 
image using DTM and exterior orientation parameters. In this 
conversion the earth curvature is taken into account. 
  
Parameters of JERS-1 
Some parameters of  JERS-1, such’ as ground ^ resolution, 
base-to-height ratio and the angle of the forward looking 
sensor are used to make JERS-1 simulation stereoscopic 
images. 
  
JERS-1 stereoscopic images 
An orthophoto image is converted to JERS-1 stereoscopic images 
using DTM and parameters of JERS-1. The base-to-height ratio 
of JERS-1 stereoscopic images is fixed to 0.3, but in this 
system we can select any other base-to-height ratio of 
stereoscopic images. The details —of —his^* “part ‘will be 
explained in the next section. 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
MAP 
LFC PHOTO. 
(1/50,000) 
AEROTRIANGULATION 
A/D CONVERSION 
Y 1 | 
EXTERIOR ORIENTATION DIGITAL DTM 
PARAMETERS IMAGE (18. 3M) 
À 1 Y 
PARAMETERS ORTHOPHOTO 
OF JERS-1 IMAGE 
  
  
  
  
  
  
  
  
  
  
  
  
  
Y y 
JERS-1 
STEREOSCOPIC 
IMAGES 
  
  
  
  
Figure 1 General flow of the system to make JERS-1 
simulation stereoscopic images 
111