Hybrid Organization and Visualization of the DSM Combined with 3D Building Model

Aiming at the geometric deformation of city buildings at the most sophisticated LOD of digital surface model(DSM) derived from oblique photogrammetry automatic modeling, we have proposed a method of organizing and visualizing the DSM combined with fine building model on the virtual globe based on WebGL and 3D Tiles. This method has resolved the problems of correlated organization of the DSM with manual model, and unified scheduling and rendering of the hybrid models. We have visualized the hybrid models by some data processing works, including flattening the mesh which presented building model and pruning redundant triangular patches at most precise tiles of LOD in the DSM, computing inserting node and associating metadata information of the fine building model with the spatial data structure of the DSM. This method can effectively solve the multi-level organization and scheduling of the hybrid models and enhance the visualization effect.