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Abstract
We improved the surface spline method to make the centers of the base functions fixed. This improvement makes it meaningful to analyze the time series of coefficients. Based on the revised surface spline (RSS) method and 2382 geomagnetic data measured in mainland China, we built Chinese Geomagnetic Reference Field 2020 (CGRF2020) to describe the spatial distribution of the geomagnetic field in most of China and surrounding areas. The root mean square residual is 0.1318 degrees for D, 0.0857 degrees for I, 93.70 nT for F, 73.94 nT for X, 65.02 nT for Y, and 97.82 nT for Z. The values of F, X, Y, and Z are about 20 nT less than those by the SCH method and IGRF13. We also preliminarily analyzed the correlation between geomagnetic anomalies and geological structures.
Highlights
As a standard geomagnetic product, the geomagnetic reference field provides a higherprecision geomagnetic description field of the region
According to Equation (2), the main parameters that determine the accuracy of the revised surface spline model include the truncation order K and the number of grid lattice distribution positions N
We obtained the fitting coefficients using the ordinary least squares method based on all four parts of the geomagnetic data, we focused on the geomagnetic field distribution in China
Summary
As a standard geomagnetic product, the geomagnetic reference field provides a higherprecision geomagnetic description field of the region. A geomagnetic reference field can provide the geomagnetic normal reference value of the target location so as to help identify whether the measurement data are abnormal and the magnitude of the anomaly. In the field of energy and mineral resources, geomagnetic reference fields are needed to provide the normal distribution of the geomagnetic field so as to help accurately estimate the geomagnetic anomaly morphology and predict the mineral locations and reserves. The high-precision geomagnetic reference field provides accurate and undisturbed navigation information for archaeological and environment investigations, military aviation, and other fields [1,2,3,4,5]. To describe the global geomagnetic field and its secular variation, the International Association of Geomagnetism and Aeronomy (IAGA) has issued the International Geomagnetic Reference
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