According to the requirement of enterprises, we designed the structure and database of a PDM prototype system, researched the data memory model and built the basic frame of the prototype system.

根据企业调研，本文设计了PD M原型系统的系统结构和数据库，研究了数据的存储模型，建立了PD M原型系统的基本框架。

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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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