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.
其次，从地图信息结构特点出发，定义了数字地图实体、整体、聚合体，并在此基础上给出了数字地图实体的数据模型。
Then, the entity, entirety and entirety set (or polymer) of digital map are defined and the data model of digital map is discussed.
针对由数字地图等以均匀网格形式给出的高程数据生成真实三维地形的仿真需求，提出了一种基于加权外推算法的地形几何模型。
For the requirements of creating 3d terrain based on the elevation data which is in the form of regular grid, a kind of modeling method based on weighted average algorithm is proposed.
针对由数字地图等以均匀网格形式给出的高程数据生成真实三维地形的仿真需求，提出了一种基于加权外推算法的地形几何模型。
For the requirements of creating 3d terrain based on the elevation data which is in the form of regular grid, a kind of modeling method based on weighted average algorithm is proposed.
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