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。
Ideally, a variety of smaller scale spatial data can be automatically derived from a large scale spatial database. That requires model generalization technology in the GIS environment.
理想的情况是能够从大比例尺空间数据库自动衍生各种小比例尺空间数据，即实施GIS环境下的模型综合。
The object spatial database stores the small-scale 2D object graph, object attribute data and multi-media data, large-scale object 3D data and so on.
目标空间数据库中存储有小比例尺二维目标图、目标属性数据以及多媒体数据、大比例尺目标三维视景数据等多种类型数据。
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