Analyzing the source of spatial data and improving the quality of spatial data are the precondition of building GIS.
分析空间数据来源、提高空间数据质量是建立地理信息系统的前提。
The basic spatial database is the core of the digital City, and the quality of spatial data is the key factor in database construction.
基础空间数据库是数字城市的核心，而数据质量的高低又是数据库建设成功与否的关键。
The basic spatial database is the core of the digital City, and the quality of spatial data is the key factor in database construction.
基础空间数据库是数字城市的核心，而数据质量的高低又是数据库建设成功与否的关键。
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