摘要
与传统测量方式比较,全球定位系统(global positioning system,GPS)测量具有定位精度高、测量时间短、操作简单、全天候作业等优势,利用GPS观测得到的大地高拟合成正常高可以大大提高测绘效率。研究了二次曲面法拟合似大地水准面模型,以豫北某区域为研究区,分别作整体区域二次曲面拟合和分区二次曲面拟合,并进行精度分析,结论如下:通过提高GPS测量的大地高精度和选用高精度的联测水准点,能够有效提高拟合后的高程精度;测区面积较大和测区地形起伏较大时,采用分区拟合高程的精度相对于整体区域拟合的精度会大大提高。
Compared with traditional measurement methods,GPS has the advantages of high positioning accuracy,short measurement time,simple operation and all-weather operation.Using GPS observations to fit the geodetic height to normal height can greatly improve surveying efficiency.The fit geoid model of quadratic surface method is studied in this paper.The quadric surface fitting of the whole and part area are performed separately in the north of Henan,and the precision analysis is performed.The conclusions included:The fitting height can be effectively improved by improving the accuracy of GPS measurements and the use of high-precision joint measurement standards.When the surveying area is larger and the topography is undulating,the accuracy of using the partitioned fitting elevation will be greatly improved relative to the accuracy of the whole area fitting.
作者
乔怡凡
汪静怡
杨明明
李长春
QIAO Yifan;WANG Jingyi;YANG Mingming;LI Changchun(School of Survering and Land Information Engineering,Henan Polytechnic University,Jiaozuo 454000,China)
出处
《测绘地理信息》
2020年第2期116-119,共4页
Journal of Geomatics
基金
河南省科技攻关项目(182102110186)。
关键词
大地高
正常高
二次曲面法
整体区域拟合
分区拟合
geodetic height
normal height
quadratic surface method
integral region fitting
partition fitting
