摘要
重力异常作为地球重力场的一种基本指标,广泛应用于大地测量、地球物理、地质、地震与海洋领域。为了快速获取高精度的未知点重力异常,本文基于EIGEN-6C4重力场模型解算某110 km×110 km区域内重力异常,构建5′×5′的重力异常格网模型,结合格网节点数据采用6种不同的插值算法拟合未知点的重力异常,最后使用外部检核的方法评价插值算法的精度。实验结果表明,6种插值算法的拟合精度均达到4 mgal以内,自然三次样条法和反距离加权插值法拟合精度最高,得到精度达到2.7 magl的重力异常。
Gravity anomaly, as a basic index of the earth gravity field, is widely used in geodesy, geophysics, geology, seismology and oceanology. In order to obtain high-precision gravity anomalies with unknown points quickly, gravity anomalies in a 110 km×110 km area are calculated based on the EIGEN-6C4 gravity field model. By constructing a 5′× 5′ gravity anomaly grid model, combined with the grid node data, 6 different interpolation algorithms are used to fit the gravity anomaly of unknown points. Finally, the accuracy of interpolation algorithm is evaluated by external checking method. The experimental results show that the fitting accuracy of the 6 interpolation algorithms is within 4 mgal . The fitting accuracy of Natural Cubic Spline and Inverse Distance to a Power is the highest, and the gravity anomaly with accuracy of 2.7 magl is obtained.
作者
李剑
王顺宏
戴陈超
杨奇松
张蓓
LI Jian;WANG Shunhong;DAI Chenchao;YANG Qisong;ZAHNG Bei(College of Operational Support, Rocket Force University of Engineering, Xi'an Shaanxi 710025, China;Xi'an Yuechuang surveying and Mapping Technology Company Limited, Xi'an Shaanxi 710048, China)
出处
《北京测绘》
2019年第4期410-414,共5页
Beijing Surveying and Mapping
