似大地水准面拟合计算中精度检核点的自动选取  

An automatic checking point selection algorithm for quasi-geoid fitting

作　　者：刘晓云 田婕 刘小鹏 聂建亮 郭鑫伟 LIU Xiaoyun;TIAN Jie;NIK Jianliang;GUO Xinwei(Geodetic Data Processing Centre of Ministry of Natural Resources,Xi'an 710054,China)

机构地区：[1]自然资源部大地测量数据处理中心,陕西西安710054 [2]自然资源部第二地形测量队,陕西西安710054

出　　处：《测绘科学与工程》2021年第2期1-5,共5页Geomatics Science and Engineering

摘　　要：似大地水准面拟合计算中一般采用外符合精度进行检验,检核点的选取须分布均匀、避开特征点又顾及GNSS/水准点的分布密度,实际生产中一般依靠人工选取检核点。为了提升似大地水准面精化生产项目的工作效率与自动化水平,提出一种基于格网抽稀原理的检核点自动选取算法,采用四个典型区域似大地水准面精化数据验证算法,结果表明选点效果良好,可用于生产。The external coincidence accuracy is generally used to check the performance ol quasi-geoid filling.The checking points should be evenly distributed and away from feature points,and the distribution density of GNSS/leveling points should also he considered.Therefore,the checking points are mainly selected by hand in practice.To improve the efficiency and automation of quasi-geoid determination,an automatic checking point selection algorithm based on grid thinning is proposed.The refined quasi-geoid data collected from four typical regions are employed to verify the algorithm,and the results show that the effect is good and the algorithm can be applied to actual production.

关 键 词：似大地水准面 拟合 精度 检核点 离散点抽稀 

分 类 号：P223[天文地球—大地测量学与测量工程]