基于8点法的等值线图自动绘制方法

Automatic Drawing for Contour Map Based on Eight-Point Method

在通用的等值线追踪方法基础上,展开了开、闭等值线的追踪算法。并在追踪过程中针对多个出口情况下的选择问题,提出了特殊的处理方法——8点法扩张判断。该方法考虑了地形地貌特征,从根本上解决了等值线追踪时的随机性,使得等值线不割裂整体地貌,不在山谷、山脊地区出现错误小圆,可还原真实地貌特征。本算法简单明了,便于用计算机进行处理,能够为坡向坡度、地形自动提取提供支撑。

Based on the general contour tracking method,this paper develops a tracking algorithm for open and closed contours.Aiming at the selection problem in the case of multiple exits,the eight-point method expansion judgment-a special treatment method is proposed.This method takes into account the topographical features.Solves fundamentally the randomness of contour tracking and does not split the overall landscape.Thus,there are no small circles in the valley or ridge and real landscape features can be restored.The algorithm is simple and clear,and is easy to be processed by computer.It can provide support for slope and automatic terrain extraction.