基于EGM2008的二次曲面模型精度分析  

Accuracy Analysis of Quadric Surface Model Based on EGM2008

作　　者：葛步月 李瑞芳 GE Buyue;LI Ruifang(Chengbang Surveying and Mapping Information Technology(Zhejiang)Co.,Ltd.,Ningbo 315800,China)

机构地区：[1]诚邦测绘信息科技(浙江)有限公司,浙江宁波315800

出　　处：《测绘与空间地理信息》2022年第4期209-210,214,共3页Geomatics & Spatial Information Technology

摘　　要：提高高程异常拟合精度是大地测量工作领域长期以来的研究热点,但常规数学模型的拟合精度比较有限,常常不能满足四等水准的精度要求。通过EGM2008重力场模型的3种插值方法分别计算高程异常的中长波,然后将剩余部分进行拟合,可以获得精度较高的高程异常拟合值。经过实例计算验证,EGM2008模型的插值方法中双二次插值法精度更高,平均误差为3.27 cm,优于其他两种方法的3.63 cm和3.39 cm。Improving the fitting accuracy of elevation anomaly is a hot topic in the field of geodetic work for a long time.However,the fitting accuracy of conventional mathematical models is limited,and it cannot meet the accuracy requirements of the fourth level.The middle and long wave of elevation anomaly is calculated by three interpolation methods of EGM2008 gravity field model,and then the rest part is fitted to obtain the fitting value of elevation anomaly with high precision.The results show that the accuracy of the double quadratic interpolation method is higher and the average error is 3.27 cm,which is better than 3.63 cm and 3.39 cm of the other two methods.

关 键 词：高程异常 EGM2008重力场模型 二次曲面模型 双二次插值法 

分 类 号：P224[天文地球—大地测量学与测量工程]