Automated 3d Building Geometrical Modeling from Dsm

This study focuses on building modeling from DSM. The objective is to develop a highly automatic system of 3D modeling. 3D reconstruction of buildings has been an active research topic in digital city and GIS applications. Various data types have been used in the researches, including multi-image, image integrated with GIS map or planning map, image integrated with DSM, etc. There are hardly commercial automatic systems for reconstruction of buildings due to the complexities of the reconstruction itself. In our study, the reconstruction algorithm is based on the polyhedral model because of the complex structure and shape of most of the modern buildings. The building modeling includes preprocessing, building detection, roof modeling and wall modeling. Edge preserved adaptive smoothing is employed to enhance the jump edges and outline of the buildings and remove the height noise within smooth regions. Outline and jump edge detection and Hough line extraction are carried out to the DSM to segment the ortho-roof plane. With DSM the 3D roof plane can be obtained. From the lines and relationships of lines and roofs the walls can be created and merged. The roofs and walls of a building are described as polygons with the vertices in anti-clockwise order. A case study is implemented to a DSM of a region of Tsukuba, Japan.