在栅格数据模型中,地图的准确性还依赖于地图的比例。
In the raster data model, the map's accuracy also depends on the map's scale.
在此基础上,提出了开放式地图出版数据模型的研究体系。
Then, the research architecture about open map publishing data model is ascertained.
因此,本文就如何利用特征数据模型对地图集中的南极数据进行描述作了阐述。
Therefore, this paper expatiates how to describe Antarctic data of the Atlas by feature-based data model.
分析了矢量电子地图的现状,对采用面向对象的数据模型和数据结构实现矢量电子地图进行了研究。
This paper analyzes the current situation of vector electronic map and investigates the realization of vector electronic map with object-oriented data model and structure.
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.
本文讨论我们设计并实现的地图数据库管理系统MDB的体系结构、数据模型、数据类型及其实现技术。
This paper discusses the architecture, data model and implementation techniques of our map data base management system MDB.
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.
当今的GIS系统的空间数据模型,主要反映地图制图领域的点、线、面对象管理与操作的几何知识。
However, the spatial data model of main GIS systems only reflect knowledge of management and manipulation objects in field of cartography, such as point, line and poly geometry objects.
本文在分析GIS、CAD以及通用出版软件数据模型的基础上提出了面向地图出版的数据模型,具体包括几何对象模型、地图模型和拓扑模型以及它们的数据库存储方案。
The data model is drive from the analysis of the data model of GIS , CAD and DTP system. It include the geometry model, the map model, the topology model and their database schema.
该文针对用于GIS的可扩充数据模型存在的问题。构造了一个适合地图数据库应用的可扩充数据模型。它以嵌套关系模型为基础.引入高阶算子定义操作。
To attack the problems on the extensible data model for GIS applications, we propose an extensible data model for map database applications in this paper.
该文针对用于GIS的可扩充数据模型存在的问题。构造了一个适合地图数据库应用的可扩充数据模型。它以嵌套关系模型为基础.引入高阶算子定义操作。
To attack the problems on the extensible data model for GIS applications, we propose an extensible data model for map database applications in this paper.
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