This paper introduces the basic operating principle of 3r Datum System, and describes its working process with an example of production.

本文介绍了3 R基准系统的基本工作原理，并通过生产实例描述了它的工作过程。

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Often, it is something global like WGS-84 (World Geodetic System 1984, used by all GPS devices), or a regional datum like NAD-83 (North American Datum 1983).

它常常是全球大地基准点（比如 WGS-84，即 World Geodetic System 1984，由所有 GPS 设备使用），或地区性大地基准点（比如 NAD-83，即 North American Datum 1983）。

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The final ERD (entity relationship model diagram) and system datum dictionary are given through data sheets normalization during logic design and physical design.

在逻辑设计与物理设计过程中通过数据规范化后得出最终的ER模型图并给出系统数据字典。

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