摘要
高程点是地形图上的重要内容之一,不同尺度的地形图需要选取不同密度的高程点。本文提出了一种顾及上下文特征及重要性的高程点分类与选取方法,首先将高程点分为重要高程点、次要高程点和一般高程点三类高程点;然后,根据重要性总结并提出了一种选取原则;接着,基于该原则,逐类按上下文特征选取高程点,得到抽稀后的高程点结果;最后,经实际数据验证表明:该方法自动识别出各类高程点,抽稀后的高程点分布可视化效果好。
Elevation points are one of the important contents in a topographic map.A topographic map with different scale has a different elevation points selection result.This paper proposed a method of classification and selection for elevation points considering context characteristics and importance.Firstly,elevation points were divided into important elevation points,secondary elevation points and general elevation points;Then,a selection principle according to the importance of the summary was proposed;Next,based on this principle,elevation points were selected class-by-class according to the context characteristics,and the result of elevation points after thinning was obtained;Finally,the experimental results showed that this method could automatically identify all kinds of elevation points,and the elevation points distribution after thinning had a well visualization.
作者
方登茂
杨健男
张彦平
FANG Dengmao;YANG Jiannan;ZHANG Yanping(Xi′an Institute of Prospecting and Mapping,Xi′an Shaanxi 710054,China;Institute of Geographic Information and Mapping,Chinese Academy of Surveying&Mapping,Beijing 100036,China)
出处
《北京测绘》
2023年第7期959-963,共5页
Beijing Surveying and Mapping
基金
新型基础测绘国家试点项目(H2212/2243/2245)
中国测绘科学研究院基本科研业务项目(AR2201)。
关键词
上下文特征
高程点
自动抽稀
制图综合
context characteristics
elevation points
automatic thinning
map generalization
作者简介
方登茂(1983-),男,安徽望江人,高级工程师,从事测绘地理信息工作。E-mail:94030238@qq.com;通信作者:杨健男,E-mail:784807960@qq.com。
