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This paper demonstrates for the first time the potential of explicitly modelling the individual roof surfaces to reconstruct 3-D prismatic
building models using spaceborne tomographic synthetic aperture radar (TomoSAR) point clouds. The proposed approach is modular
and works as follows: it first extracts the buildings via DSM generation and cutting-off the ground terrain. The DSM is smoothed using
BM3D denoising method proposed in (Dabov et al., 2007) and a gradient map of the smoothed DSM is generated based on height
jumps. Watershed segmentation is then adopted to oversegment the DSM into different regions. Subsequently, height and polygon
complexity constrained merging is employed to refine (i.e., to reduce) the retrieved number of roof segments. Coarse outline of each
roof segment is then reconstructed and later refined using quadtree based regularization plus zig-zag line simplification scheme. Finally,
height is associated to each refined roof segment to obtain the 3-D prismatic model of the building. The proposed approach is illustrated
and validated over a large building (convention center) in the city of Las Vegas using TomoSAR point clouds generated from a stack of
25 images using Tomo-GENESIS software developed at DLR
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