有关地球表面磁场的一个小程序，并不复杂．希望大家多给意见多指教．-Magnetic field of the Earth' s surface, a small procedure, not complicated. Hope that we give the views of more than advice. Thanks

利用12阶12次勒让德球谐函数准确计算地球表面及近地空间的地磁场信息，输入参数：三维地理位置（纬度、经度、海拔高度（以千米为单位））和时间（小数年），输出：地磁场的7个量，包括：地磁场总强度F、地磁场水平分量H、北向分量X、东向分量Y、垂直分量Z以及地磁偏角D和磁倾角I。-The use of the order of 12 12 Legendre spherical harmonics geomagnetic information to accurately calculate the Ea

有32种常规算法的介绍和matlab实现，BP神经网络的源码，地球磁场的matlab仿真，磁线的仿真(The introduction of 32 conventional algorithms and the matlab implementation, the source code of the BP neural network, the MATLAB simulation of the earth's magnetic field, and the simulation of the