本文着重讨论底图数字化、对话窗、多边形拓扑等关键问题。
The paper is focused the discussion on the problems of background map digitization, dialog box, polygon topology etc.
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.
如果一个点击拓扑不是任何情况下的正确答案，你可以直观的曲线重新拓扑的过程控制，协助确定多边形流。
If one-click topology isn't the right answer for every situation, you can intuitively take control of the re-topology process with curves to assist in determining polygon flow.
本文基于拓扑理论和多边形图的性质，提出了基于区域的二维边坡地层建模方法。
Based on the topological theory and the property of polygon graph, a region-based stratum modeling method in slope stability analysis has been developed.
通过依次抽取外接凸多边形，将凹多边形表达为仅由凸多边形组成的多层拓扑结构。
Next, by extracting convex polygons consecutively, the noconvex polygon is described as topological structure made of convex polygons at defferent layers.
本文通过分析遥感分类图栅格像元之间的关系，快速自动地提取矢量数据点及其连接信息，进而利用连接信息快速生成弧段，由弧段自动组建多边形并建立完整的拓扑关系。
In this paper, we analyzed the relations between pixel and pixel in the classified raster map. Based on the relations, all vector points and the connection information between them can be extracted.
本文通过分析遥感分类图栅格像元之间的关系，快速自动地提取矢量数据点及其连接信息，进而利用连接信息快速生成弧段，由弧段自动组建多边形并建立完整的拓扑关系。
In this paper, we analyzed the relations between pixel and pixel in the classified raster map. Based on the relations, all vector points and the connection information between them can be extracted.
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