So the construction, organization and management of 3d model data is a critical issue to be solved urgently in virtual geographical environment system.
因此虚拟地理场景中三维模型数据的构建、组织与管理是目前虚拟地理环境建设亟需解决的核心问题之一。
The distributed integration of geographical models is one of the main objectives of the virtual geographical environment.
地理模型分布式集成是虚拟地理环境研究的主要内容之一。
The flexible and efficient viewpoint control mechanism is the base of interaction between human and virtual geographical environment. Its capability influence work efficiency of human directly.
灵活、高效的视点控制机制是人与虚拟地理环境进行交互的基础，它的性能直接影响人的工作效率。
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