Hiroshi Masaharu 
  
The 3-D model obtained by assigning heights to each polygon, nevertheless, looks rather realistic. The complexity is 
mitigated by adding one more dimension. On the other hand, this method separates the parts having different stories of 
a building and also separates objects on roofs. This makes the 3-D scenery realistic. 
In this regard, this method has advantage over the method that uses existing map data for planimetric shape and gives 
homogeneous height to it from laser scanner data. By comparing these two methods, the followings were found. First, 
  
  
Figure 6. Bird’s-eye View of the 3-D Model, Tsukuba City 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000. 559