ISPRS Commission III, Vol.34, Part 3A , Photogrammetric Computer Vision*, Graz, 2002 
  
    
  
  
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(e) (f) (g) (h) 
Figure 1: Perceptual Organization of Set A: (a) 3D surface points with the elevations encoded by the colors. (b) Aerial 
photo of the same area. A building, a parking place and a road are identified. (c) Segmented patches visualized with six 
different colors. (d) Merged surfaces with boundaries. (e) Derived intersections and corners. (f) Grouped surface clusters. 
(g) Identified ground surface cluster. (h) Extracted Above-ground surface clusters. 
  
  
  
  
  
  
  
  
  
  
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(c) (d) 
Figure 2: Perceptual Organization of Set B: (a) 3D surface points. (b) Merged surface with boundaries, and derived 
intersections and corners. (c) Grouped surface clusters. (d) Identified ground surface cluster. 
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