简言之，矢量数据利用最简单的拓扑实体—点、线和多边形，并在二维笛卡尔坐标系统中固定它们来描述地理特征。
In short, vector data take the simplest topological entities — points, lines, and polygons — and anchor them within a 2-d Cartesian coordinate system to describe geographical features.
空间、属性、时间是地理现象的三个基本特征或地理信息系统数据库的三种基本数据成分。
Space, thematic attribute and time are the three basic characteristics of geographical phenomena or the essential data types of GIS database.
与地形数据综合一样，专题数据综合需要依据一定的综合规则来保障数据综合围绕应用的需求、反映主要地理特征。
As the generalization of topographic data, thematic data generalization needs the support of generalization knowledge to satisfy the use requirements and reflect the main geographic nature.
地理特征对象是时空数据组织的基本单元，而事件是导致时空数据发生变化的根本原因。
The feature is an essential element that comprises spatiotemporal data information and the event is a fundamental factor that result in changing spatiotemporal data.
采用语义数据模型的方法，提出利用地理特征这一概念作为建模的基本概念。
The GIS semantic data modeling approach has been used as a tool to design the needed conceptual model.
遥感图像为地理信息系统数据的更新和应用提供了有利条件，遥感图像的特征提取是其中的关键问题。
Remote sensing image provides the condition for Updates and application of GIS and edge extraction is important in the process.
本文探讨了能更好表达地理特征的数据模型。
This pap er describes a feature -based model that enhances the representation of geographical feature.
在GIS支持下， 以建立的数据库为基础研究了我国红线保护植物的地理分布特征；
On the platform of GIS, the distribution of redline protected plants was studied on the basis of high precision database.
介绍了动态分段技术在交通地理信息系统中应用的基本原理和方法，分析了其对线性特征进行管理时的数据模型和数据结构，在实际项目中实现了其应用。
This paper presents a traffic information system based on wireless mesh network, which uses probe vehicles to collect traffic information and transmits the information through wireless mesh network.
现有的基础地理空间数据库大都利用关系数据库来存储和管理空间地理信息，是具有相同特征的空间数据的有序集合。
The existing geospatial databases are mainly use relational database to store and manage spatial information, and it is orderly spatial data set with the same characteristics.
主要结论如下：（1）构建了大理河流域地理空间数据库，阐明了流域土壤侵蚀空间分布的下垫面特征。
The main conclusions are as follows:(1)Dalihe River Geospatial Database was constructed, and the characteristics of the underlying surface in which was studied.
主要结论如下：（1）构建了大理河流域地理空间数据库，阐明了流域土壤侵蚀空间分布的下垫面特征。
The main conclusions are as follows:(1)Dalihe River Geospatial Database was constructed, and the characteristics of the underlying surface in which was studied.
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