As the foundation of "the digital city", the geo-spatial data sharing mechanism is one of the main bottlenecks of "digital city" or its associated works.
地理空间数据共享机制是“数字城市”的基础，也是“数字城市”或其相关工程开展的主要瓶颈之一。
Geo Spatial data Transfer Standard is an important part of "National Spatial data Infrastructure (NSDI)", as well as a necessary means for data sharing.
空间数据交换标准是国家空间数据基础设施的一个重要组成部分，也是目前实现空间数据共享的一个必要手段。
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