一种面向复杂桥梁对象的自动符号化方法

An Automatic Symbolization Method on Irregular Bridge Feature Based on Mathematical Morphology

针对现有复杂面状对象无法实现自动符号化的问题,本文以复杂桥梁为例,提出了一种基于数学形态学的自动符号化方法。该方法首先对原始数据进行预处理,然后采用Rosenfeld细化算法,提取原始面状桥梁对象的矢量骨架中心线,进而通过后处理工序,借助交点搜索算法、交角判断准则确定候选节点、候选桥爪线,最终通过缓冲区相交判断确定桥爪线,绘制桥梁边线。实验证明,该算法可以将传统算法无法实现的复杂面状桥梁按国家标准进行自动符号化,大大降低了人工干预的工作量。

Irregular or complex features on digital mapping couldn’t be automatic symbolization by traditional symbolization methods.A new method is presented based on mathematical morphology with a case study of irregular bridge feature.Firstly,original data should be pre-processing.Then the skeleton centerline of original data would be extracted by Rosenfeld Thinning Algorithm.In terms of intersection searching,angle judgment of intersection,candidate notes and sidelines of bridge feature could be found.At last,based on buffer analysis method,the angle of bridge symbol and sidelines of bridge feature could be determined.