Building reconstruction from Worldview DEM using image information

Kurzfassung

In this paper an algorithm is proposed for extraction of 3D models corresponding to the buildings from Digital elevation Models (DEM) produced from Worldview–2 stereo satellite images. The edge information extracted from orthorectified images are used as additional information for 3D reconstruction algorithm. Particularly the complex buildings containing several smaller building parts are discussed. For this purpose, a model driven approach based on the analysis of the 3D points of DEM in a 2D projection plane is proposed. Accordingly, a building region is divided into smaller parts according to the direction and the number of ridge lines for parametric building reconstruction. The 3D model is derived for each building part and finally, a complete parametric building model is formed by merging the 3D models of the building parts and adjusting the nodes after the merging process. For remaining areas which do not contain ridge lines, a prismatic model by approximation of the corresponding polygon is derived and merged to the parametric models to shape the final model of the building.