Method for Three-Dimensional Abstraction and Description of City

ion method and expression mode. According to the above, the authors put forward several new concepts and methods that are 3D geographic element system, spatial granularity for 3D description (3DSG), 3D partition of building and urban model databases. By applying the above methods, the authors reconstruct the 3D digital city of Weihai, and the practice proves that these methods are suitable for the reconstruction of 3D city scene.