International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B5. Istanbul 2004 
  
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3.PREPARATION OF TOPOGRAPHIC MAP FOR 
LANDSLIDE AREA 
1 The landslide area was measured using the 
| inertial photogrammetric camera system. The 
place as an object is the steep landslide area 
shown in Figure7. The landslide area and the 
! river are located between the center part enclosed 
i with the circle on the map of Figure7 and there is 
an embankment. The landslide area has a height 
of about 60 meters and a width of about 100 
| meters at the lower end of landslide area, and the 
inclination angle is about 50 degrees. 
  
3.1 Experiment field and aspect of experiment 
| White board of 80 cmx80cm size was installed in 
several pieces in the landslide area in order to 
examine the accuracy of measurement result got 
by the inertial photogrammetry, It was measured 
by the Total Station and was made to be a true 
value. The photographing was carried out by the 
transfer of the camera in respect to the 
embankment in the opposite shore which 
separated about 120 meters from landslide area, 
  
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akagawa river 
Figure7. Map ofthe experiment field 
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Figure8. Aspect of experiment 
as it is shown in Figure7. The upper 
embankment contained a rugged dirt lane 
which caused the mounted camera on the cart 
to shake a lot while being tlansferd. The aspect 
of the experiment is shown in Figure8. 
3.2 photographing 
The cart was made to move to B point, C point, 
D point, after the photographing was carried 
out at photographing start point A, as is shown 
in Figure9, The photographing was almost 
perpendicularly carried out for the landslide 
area. Figurel0 shows the stereo photograph 
taken a picture with À point and C point. 
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A = andslide area > A X White bord 
A D |Photograph sitd 
  
  
  
  
  
  
  
Nakagawa river 
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Experiment field 
Figure9. Photography 
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