摘要
点与多边形拓扑关系判断是空间拓扑分析的重要内容之一,基于以往算法不可靠和过于复杂的缺点,本文提出了面积判断法,很好地解决了上述问题,且对于含有孤岛的多边形仍然有效。矢量多边形坐标存储顺、逆时针的判断是数据验证、数据转换必不可少的一项,但对于此种算法少有提及,为此本文提出了外围判断法,可以较为简单地完成此项任务,填补了此类算法的空白。
Analysis of topological relation between point and polygon is an important component of topological analysis. Because the old algorithm is too uncertain and complicate to use, this paper proposes area-judgement method to solve those problems. That algorthm is suitable to polygon with isolated islands too. It is necessary to determine whether a polygong coordinates are stored in clockwise or anti-clockwise order for data check and data transformation. But there only a small quality of such algorithm is shown. Therefore, this paper proposes the periphery judgement method and such analysis will be finished easily. It is a supplement of such algorithm.
出处
《测绘与空间地理信息》
2007年第1期84-86,共3页
Geomatics & Spatial Information Technology
关键词
拓扑判断
面积判断法
外围判断法
数据转换
topological analysis
area-judgement
periphery judgement
data transformation
