基于格网模型的GPS水准拟合方法研究  

Study on GPS level fitting methods based on grid model

作　　者：李春华[1,2] 罗志才[3] 邓芳[2] 黄丁发[1] 

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]成都市勘察测绘研究院,成都610081 [3]武汉大学测绘学院,武汉430079

出　　处：《测绘科学》2009年第S2期38-40,共3页Science of Surveying and Mapping

基　　金：成都市似大地水准面精化项目资助(200703066)

摘　　要：本文结合成都市1′×1′和2′30″×2′30″格网似大地水准面模型,利用110个高精度GPS水准点数据,分析了采用加权平均、Shepard曲面、多项式和移动曲面等拟合方法进行GPS高程转换的精度。结果表明,二次曲面拟合法略优于其他三种方法,1′×1′格网似大地水准面模型的精度明显优于2′30″×2′30″格网似大地水准面模型的精度,以WDM94和EGM96为参考重力场模型分别构建的成都市似大地水准面模型的精度并无显著差异。Weighting average method,Shepard surface fitting method and moving surface fitting method were compared with polynomial fitting method in the interpolation precision of height anomaly in Chengdu,P.R.China,based on Chengdu quasi-geoid grid with resolutions 1'×1' and 2'30″×2'30″,and 110 high precision GPS/leveling points.Test results show that the quadratic surface fitting method is better than others,and the interpolation accuracy of Chengdu quasi-geoid grid with the higher resolution 1'×1' is notably better than another,and it has no obvious difference between the quasi-geoid models constructed using WDM94 and EGM96 as reference gravity field model respectively.

关 键 词：似大地水准面格网 高程异常 拟合方法 

分 类 号：P228.4[天文地球—大地测量学与测量工程]