Christopher O. Jaynes, Frank R. Stolle, Howard Schultz, 
Robert T. Collins, Allen R. Hanson, and Edward M. Riseman, 
"Three-Dimensional Grouping and Information Fusion for
   Site Modeling from Aerial Images,"
Arpa Image Understanding Workshop, 
Palm Springs, CA, February 1996, pp. 479-490.


The building reconstruction strategies that have been used in the UMass ASCENDER system are reasonably effective, but are tuned to extract only one generic building class with single-level, flat roofs bounded by rectlinear polygonal shapes. Extensions to the system must be considered in order to handle other common building types. Examples are multi-level flat roofs (or single-level flat roofs containing significant substructures such as large air conditioner units), peaked-roof buildings, juxtapositions of flat and peaked roofs, curved-roof buildings such as Quonset huts or hangers, as well as buildings with more complex roof structures containing gables, slanted dormers or spires. To achieve the desired goal of a more general and flexible building extraction system in the ARPA/ORD RADIUS program, a significant research effort is underway at UMass to explore alternative detection and reconstruction strategies that combine a wider set of algorithms for generating and fusing 2D and 3D information.

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