To build a realistic Virtual GIS environment on the Internet is quite meaningful but difficult.
在Internet上创建逼真的虚拟GIS环境是相当有意义的，同时其难度也相当大。
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。
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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