As the main form of national Spatial Data Infrastructure, 4d is widely used in many national economic fields in place of traditional maps.
作为国家基础地理空间框架数据的主产品形式，4d产品正逐步替代传统的模拟地图，在国民经济的众多领域得到广泛应用。
National Digital Geospatial data Framework is the important component of National spatial data infrastructure, and will serve widely to ITS.
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。
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。
DEM has been one of basic contents of National Special Data Infrastructure (NSDI) in various countries and integrated by Numeric Spatial Data Frame (NGDF) to produce in large scale.
DEM已成为世界各国空间数据基础设施(NSDI)的基本内容之一，被纳入数字化空间数据框架(NGDF)进行规模化生产。
DEM has been one of basic contents of National Special Data Infrastructure (NSDI) in various countries and integrated by Numeric Spatial Data Frame (NGDF) to produce in large scale.
DEM已成为世界各国空间数据基础设施(NSDI)的基本内容之一，被纳入数字化空间数据框架(NGDF)进行规模化生产。
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