本文作为“设备管理系统中三维数字地图的研究”子课题，将三维模型应用于设备管理中。
This text is regarded as the sub subject of "Research on three-dimension digital map in the equipment administrative system ", apply the three-dimensional model to the management of the equipment.
通过误差来源的分析和误差模型的建立，提出了一种车辆导航中gps定位测量与数字地图实时配准的地图匹配算法。
According to the given source and mathematic model of matching error, a algorithm for real time matching of GPS positioning results and digital maps is put forward.
作者通过变焦数据模型原理，探讨如何建立多层存贮结构，将数字地图中的大比例尺地图数据库自动导出小比例尺图形。
This paper discusses how to establish multilayer storage structure and automatically reduce small scale graph from large scale mapping database by theory of changed-focuses Datum Model.
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