Edward M. Mikhail 
of faster tools for model verification, change detection, damage assessment, and photospecific modeling of feature data, 
The use of digital projectors can simplify the data preparation process for virtual reality applications while adding 
greater realism. 
An example of multi-source data fusion is shown in Figure 34. An ortho-rectified thematic map and frame image are 
projected and blended on the terrain and feature models. What is new here is that the source images are not being 
blended in image space or a common ortho projection. They are simply being re-projected through their individual 
sensor models onto the terrain and feature surfaces. This eliminates all the data preparation steps required for multi. 
source data fusion and results in a streamlined and rapid process. 
  
  
  
Figure 33 Figure 34 
  
  
  
  
Another example is in Figure 35. Here the fusion of imagery taken with a hand held camera together with aerial 
imagery enables exciting new capabilities for immersive VR. Notice the depth shadows in the lower left image. This 
sensor occlusion information can be utilized in Line-of-sight analysis, sensor coverage, etc. 
Finally, Figure 36 depicts the on-the-fly generation of an ortho mosaic. True orthographic mosaics can be generated on 
the fly in real time by simply taking an orthographic overhead view of a scene that uses digital projectors. This wil 
readily support real-time video projected onto topographic map data and retain an orthographic viewpoint if desired 
(usually the case if you need to read text on the map). 
  
  
  
     
Figure 35 Figure 36 
  
  
  
  
  
  
606 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000. 
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