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。
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