Abstract: The paper elaborates on the technical route for rapid construction of terrain level realistic 3D models, developes a multi-source feature fusion based urban level realistic 3D reconstruction technology,improves model method of point cloud feature extraction and topological construction of building tops and stereotypes,automatic matching of tilted images and top surface models,realizes 3D reconstruction of complex roofs,improves the refinement and geometric accuracy of model textures,describes the process of component level realistic 3D automated modeling,indicating the real-life 3D model application under the public security emergency management,national spatial planning,natural resource management and other service scenarios of Ningbo, and the next steps of thinking.

Key words: oblique photography, realistic 3D, multi-source heterogeneous, 3D cadastra