SAGE系统采用来自国家地理空间情报局的国土安全基础设施计划的地理空间数据。
SAGE USES geospatial data from the National geospatial Intelligence Agency's Homeland Security Infrastructure Program.
空间数据模型是地理信息系统设计的核心和基础。
Spatial data model is the core and base of three dimensional geographic information system design.
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。
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.
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