区域似大地水准面再精化精度影响因素分析  

Analysis of Influencing Factors on the Precision of Regional Quasi-Geoid Re-refinement

作　　者：安艳辉[1] AN Yanhui(Jiangsu Province Surveying and Mapping Engineering Institute,Nanjing 210013,China)

机构地区：[1]江苏省测绘工程院,江苏南京210013

出　　处：《测绘地理信息》2020年第4期75-78,共4页Journal of Geomatics

基　　金：江苏省测绘地理信息局项目(JSCHKY201923)。

摘　　要：介绍区域似大地水准面再精化方法,以江苏省域内不同精度的重力似大地水准面及试验区全球导航卫星系统(global navigation satellite system,GNSS)/水准数据为例,计算分析了GNSS/水准点数、初始重力似大地水准面精度和内插拟合方法对再精化水准面的影响。结果表明,初始重力似大地水准面精度优于10 cm时,其再精化水准面结果精度与初始重力水准面精度关系不大,但其离散程度和初始重力水准面精度相关;平面/二次拟合与反距离平方加权内插结合使用效果更优,三次拟合与Shepard内插结合使用效果最优。结论对今后区域似大地水准面再精化工作中方案的选择、成本的节约等方面有一定的指导意义。This paper introduces the method of regional quasi-geoid re-refining.Taking the GNSS(global navigation satellite system)/leveling data of different precision gravity quasi-geoid and test area in Jiangsu Province as an example,the effects of GNSS/leveling points,initial gravity quasi-geoid accuracy and interpolation fitting method on the re-refining leveling are calculated and analyzed.Several conclusions have been drawn as follows:When the accuracy of the initial gravity quasi-geoid is better than 10 cm,the accuracy of the results of the re-refined level is not related to the accuracy of the initial gravity level.However,its dispersion is always related to the accuracy of the initial gravity level.The combination of plane/quadratic fitting and inverse distance square weighted interpolation is more effective,while the combination of cubic fitting and Shepard interpolation is the best.The conclusion of the paper has certain guiding significance for the selection of scheme and cost saving in the future regional quasi-geoid re-refining work.

关 键 词：区域似大地水准面再精化 全球导航卫星系统/水准 初始重力似大地水准面 拟合和内插方法 精度分析 

分 类 号：P223[天文地球—大地测量学与测量工程] P228[天文地球—测绘科学与技术]