摘要
境界跳绘处理是地图制图中比较特殊的一个制图步骤。本文在分析境界线属性的基础上,提出了将跳绘境界线分为跳绘符号段和跳绘间隔段两部分,通过计算各个跳绘符号段中点来确定跳绘符号段坐标串的方法。在计算符号段中点时,首先分别计算境界线的明显拐弯点和距离两端半个符号段长度的点作为跳绘符号段中点,将这些中点进行一定的合并与删除后,再计算两两中点间可能存在的其余符号段中点。实验证明该方法可行有效。
Boundary Jump-Drawing has been regarded as a special step in map making.Based on analysis of property of boundary,a method is proposed in this paper for solving boundary Jump-Drawing problems.Firstly,boundary is split into two parts,the drawing symbol section and the drawing gap section.In this way,coordinates of each drawing symbol section can be determined by calculating the middle point of each section.Then,to find the middle point,obvious inflexions and points which have an equal distance from any end point of the drawing symbol section,are first detected as candidate for middle points in our program,and then those other possible points are calculated after merging and deleting these former middle points.Finally,this approach turns out effective in our experiment.
出处
《测绘科学》
CSCD
北大核心
2007年第2期49-50,56,共3页
Science of Surveying and Mapping
基金
国家测绘局基金项目(1469990324231)
关键词
制图
境界线
跳绘
弯曲识别
mapping
boundary
jump-drawing
curve detection
