根据地性线绘制等高线的研究

A Research on Contour Plotting Based on Bone Lines

根据地形特征点和地性线绘制等高线是测绘大比例尺地形图等高线的主要方法，本文在分析现有自动绘制等高线方法的基础上，提出了一种根据地性线及其拓扑关系直接求取和跟踪等高线的方法。针对利用各种传统曲线光滑算法所绘相邻等高线间常常出现不协调现象的缺点，首次提出并详细讨论了相邻等高线通过点间的抛物线双向加权平均光滑算法。大量实践表明，利用本文所提出的跟踪和光滑方法所绘等高线的光滑性和协调性是令人满意的。

It is the main way to plot contours on large scale topographic maps with topographic characteristic points and bone lines. On the basis of analyzing the existed methods of plotting contours, we put forward a new approach to tracing and potting contours in this paper. In order to overcome the inharmony between adjacent contours processed with kinds of traditional curve smoothing algorithms, the half parabola dual direction weighted average smoothing algorithm is put forward for the first time and discussed in detail. Experiments show that the smooth and harmony of the contours traced and plotted with the proposed method is satisfactory.