Profile-based 3D modeling of urban underground space

At present, the utilization of the urban underground space is not only an important component of the urban construction, but also a useful means to expand the development in many cities. Profile, as an important result map of the underground space exploration, plays a significant role in the 3D modeling in the urban underground space. To solve the current abstraction and inaccessibility of the information of the urban underground space, the paper puts forward the 3D modeling based on the existing 2D profile to construct the urban underground space, explores the process of 3D modeling and analyzes the correspondence and the connection constraints of the polygons of the profile section. At last, the connection arithmetic on the constrained section polygons is realized and the 3D modeling simulation is achieved.