在GPS测量中，往往需要计算三角形、多边形闭合差，以便及时发现观测粗差、衡量GPS观测精度。
In GPS surveying, we usually need to compute closure difference of triangle or polygon, so as to search surveying gross errors and estimate GPS observing precision.
对于平面多边形的闭合集空间合成算法，本文详细讨论了实现的理论基础、各个步骤的处理规则等。
Forthe spatial synthetic operations algorithms about the closed set of polygons in the plane, this dissertation discusses the theory of the implementation and processing rules of each step in detail.
多边形的自动搜索是GIS空间分析的基本算法之一，同时也在地籍拆宗、导线网闭合环的闭合差计算等领域有着重要的作用。
Automatic searching polygon is one of essential algorithm in GIS spatial analysis and important used in cadastral treatment and closing error of traverse network calculation.
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