摘要
点线之间的相互关系是GIS空间分析中的基本内容。通常可通过计算两点或点到线的距离来加以判断。然而,由于点及线都不可避免的存在定位误差,使得点与点或点与线即使相互重合,其间的距离也不一定为零。对此常规的应用软件均采用设定阈值的方法加以判断。因此应用误差理论的基本知识,估计了间距计算的中误差,给出了判断点线关系阈值大小的计算公式。
<Abstrcat> The relations among points and lines are the basic contents. We can usually judge them by calculating the distance between two points or a point and a line. However, owing to existing position errors which can't avoid, the distance isnt always zero, even if one point cover another or it lies on the line. It is usually solved by giving a limited value in infernet application.Based on error theory, the mean square error of this distance are estimated and some calculating formulas of limited value of judging relations about points and lines are given in this paper.
出处
《西安工程学院学报》
2002年第2期62-64,共3页
Journal of Xi'an Engineering University
基金
.NULL.
关键词
阈值
定位误差
判断
距离
limited value
position error
judge
distance
