利用Python编程实现基于EGM2008模型的高程异常计算  

Realization of Height Anomaly Calculation Based on EGM2008 Model Using Python Programming

作　　者：吴勇 常燕敏 WU Yong;CHANG Yan-min(Surveying and Mapping Team,Sichuan Geological and Mineral Exploration and Development Bureau,Chengdu Sichuan 610017,China)

机构地区：[1]四川省地质矿产勘查开发局测绘队,四川成都610017

出　　处：《地矿测绘》2022年第2期21-25,共5页Surveying and Mapping of Geology and Mineral Resources

摘　　要：在实际测量工作中,高程异常的计算是大地高转正常高的关键步骤。据此,文章提出了基于“移去-拟合-恢复”的思想,利用全球重力场模型计算高程异常的长波分量,结合已知GNSS水准点的数据来拟合高程异常的短波分量和残余部分,从而计算出高程异常值。通过实例验证高程异常值的计算精度,得出实测高程异常值与拟合恢复后的高程异常值较差的中误差为2.56 cm,说明本文所述方法具有较高精度,且具有较好的实用性。In actual surveying work,the calculation of height anomaly is the key to converting the geodetic height to normal height.Based on Remove-Interpolate-Restore Arithmetic,the global gravity model is used to calculate the long-wave component of height anomaly,and its short-wave component and residual part are fitted with the data of known GNSS level points,so as to calculate the height anomaly.The calculation accuracy of height anomaly value is verified by an example,and the mean square error between the measured height anomaly value and the fitting recovered height anomaly value is 2.56 cm,which shows that the method described in this paper has high precision and good practicability.

关 键 词：高程异常 PYTHON EGM2008 曲面拟合 

分 类 号：P223[天文地球—大地测量学与测量工程]