Abstract
Efficient visualization of three-dimensional (3D) city models at various scales is one of the pivotal techniques to support 3D applications in mobile and Internet environments. In this paper, a framework is proposed to visualize 3D city models online using Internet browsers without plugins. City Geography Markup Language (CityGML) and Extensible 3D (X3D) are used to represent and present 3D city models. Then, generalization methods are studied and tailored to create 3D city scenes at block and building levels; multiple representation structures are designed to preserve the generalization results at different scales. Finally, the quality of generalized 3D city models is evaluated in a case study. The experiment results show that the proposed generalization method can reduce the number of visualized buildings dramatically, which is essential for online applications.
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