Efficient Region-based 3D Urban Building Reconstruction from TomoSAR Images

The tomographic synthetic aperture radar (TomoSAR) technique has been gaining attention because it can retrieve the three-dimensional (3D) structures of urban buildings by synthesizing apertures along the elevation direction. However, most existing TomoSAR methods in literature calculate elevations pixel by pixel and overlook the correlation between elevations, leading to low accuracy and efficiency. To solve these problems, this study introduces an efficient region-based 3D urban building reconstruction method that incorporates different geometric primitives (i.e., points, planes, and models). Specifically, the proposed method, under the constraints constructed by different geometric primitives, follows three steps to reconstruct the box-like models of urban buildings: (1) It detects double-bounce regions and reconstructs box-like models based on plane sweeping and region growing. (2) It reconstructs box-like models based on multi-plane fitting and optimization for non-double-bounce regions. (3) It regularizes box-like models based on building layout priors (e.g., collinearity and proximity). Experimental results on two datasets show that the proposed method can efficiently produce reliable results and outperforms several existing methods both qualitatively and quantitatively.