As one of the key technologies of the virtual city construction, virtual GIS has been a hot study area in the current research field of GIS.

虚拟GIS作为虚拟城市建设的关键技术之一，已经成为当前GIS研究领域的研究热点。

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Virtual Navigation is the specific application of virtual reality technology under Digital City construction, it is also a important problem in Digital City research.

虚拟导航是虚拟现实技术在数字城市建设上的具体应用，是数字城市研究中的重要问题。

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