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 Earth s surface and near-Earth space, the input parameters: three-dimensional location (latitude, longitude, altitude (in kilometers)) and time (decimal years ), output: 7 amount of the geomagnetic field, including: geomagnetic total intensity F, the horizontal component of the geomagnetic field H, northward component X, east component Y, Z, and the vertical component of magnetic declination D and inclination I.