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Figure 5 b The old ITC in its virtual environment. 
  
The case studies have shown that the 3D-FDS offers good ^ point features. The data model supports a wide range of 
possibilities of spatial analysis for applications where the real ^ queries, from simple class retrieval to metric queries and 
world can be described by solid objects, surface, line, and complex topologic ones. 
865 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996