An Adaptive Organization Method for Complex 3D City Models Considering User Experience

The traditional method for visualization of 3D city models based on a“Layer-Object" doesnot consider the granularity differences in different data type and in different levels of detail，which recults in the low transmission efficiency in the network environment and does not satisfy the need forsmooth visualization with multi-user concurrent accesses. This paper analyzes the characteristics of anuser experience including roaming over a wide range and focusing on small range，and proposes amethod of using an index metadata to coordinate the organization and scheduling of model objects，which delivers instant responses to user requests，and at the same time，by decomposing model obsects，decreases invalid data transmission. This paper describes the design of unified object ID strumsture to implicitly store the relationships of LoD models and decomposed objects to support distributedmanagement. Finally，the validity and feasibility of this method are demonstrated through experi-menu on the platform of a distributed database MongoDB.