GIS系统可获得并处理描述地球表面的空间数据。
GIS systems acquire and process spatial data describing the Earth's surface.
为了提高空间数据的表示和处理能力，对空间对象进行准确的描述是非常必要的。
To improve the spatial data representation for their subsequent processing, a description for spatial objects is indispensable.
描述地球表面的基础地理信息数据是国家空间数据基础设施建设中的重要组成部分。
National Digital Geospatial data Framework is the important component of National spatial data infrastructure, and will serve widely to ITS.
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