Abstract: The real 3D model of UAV will be distorted and deformed when the data is missing, the precision of the model is not high,and it can not be directly used in the management application of smart cities due to the modeling mechanism and other reasons. This paper takes the fine modeling of the 100 square kilometers central urban area of Jiangning district, Nanjing as the research object, use multi-source heterogeneous data to build a 3D model of large scenes,completed the fine modeling and 3D visualization of various infrastructure based on the 3D model. The results show that the constructed refined model has high mathematical accuracy, exquisite model expression and excellent integrity,the 3D visualization system can carry the rapid loading and operation of massive 3D model data, and can provide services and applications for the management of smart cities,The research provides certain reference value for the construction of large-scale 3D refined city models.

Key words: oblique photogrammetry, fine modeling, 3D city model, 3D visualization