摘要
本文针对绘制雨量等值线的特点,指出了其他算法对等值线追踪完成后进行光滑时存在的缺点。介绍了张力样条函数的数学原理及其在等值线光滑应用上的优点。经过研究可知,张力样条函数可根据追踪等值线过程中节点的疏密程度自动调整张力系数,解决了光滑邻近等值线时相交这一个棘手的问题。在绘制北京市平谷地区雨量等值线图过程中,应用张力样条函数算法光滑后的雨量等值线图达到了很好的效果。
This paper pointed out the shortcomings of other algorithms in the process of isoline smoothing after completing isoline tracking for the features of drawing rainfall isoline. The mathematical theory and merit of tension spline function in rainfall isoline smoothing were also introduced. The study shows that the tension spline function can adjust the coefficients automatically in terms of the node generating in the isoline tracking process, which resolves the intractable intersecting problem of the adjacent isoline smoothing. The rainfall isoline smoothed by the tension spline function algorithm in the process of making rainfall isoline map of Beijing Pinggu District has much better effects.
出处
《水文》
CSCD
北大核心
2007年第1期22-25,共4页
Journal of China Hydrology
基金
国家科技攻关计划项目"城市规划
建设
管理与服务数字化工程"(2002BA107B03)
关键词
张力样条函数
等值线
曲线光滑
张力系数
雨量
GIS
tension spline function
isoline
curve smoothing
tension coefficient
rainfall
GIS
