Abstract: The technology of automatic production of real 3D model by tilt photogrammetry has been developed and mature gradually, and it has the characteristics of high efficiency, low cost, good accuracy and simple operation. In order to make the real 3D model more refined and available, this paper firstly analyzes the automatic construction methods and processes of the 3D model, including preprocessing, aerial triangulation and 3D model generation. Then, the fine processing of 3D model is studied, including model modification and monomer model construction, the former mainly includes suspension deletion, road leveling, water surface mending and elevation texture modification. The latter mainly uses DP modeler professional software to reconstruct the monomer model. Finally, the specific application of the fine 3D model in planning, cultural relic protection and real estate registration is discussed.

Key words: tilt photogrammetry, 3D model, monomeric, model modification, aerial triangulation