Surface spline based constructing method for geomagnetic reference map

Precise geomagnetic reference map is needed for geomagnetic matching navigation and surface spline method is used in this paper to construct small-scale geomagnetic reference map. Of all the pretreated data, a part of them are used to construct the surface spline model, and the remain are used to validate the model, and then the data needed for the geomagnetic reference map are calculated by the surface spline model. Interpolation methods based on Kriging and radial basis function are also used to compare with the method based on surface spline. Results show that the constructing method of geomagnetic reference map based on surface spline is feasible.