GSSA Fowler TotalMagneticIntensity grid geodetic
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Total magnetic intensity (TMI) data measures variations in the intensity of the Earth's magnetic field caused by the contrasting content of rock-forming minerals in the Earth...
总磁场强度（Total Magnetic Intensity, TMI）数据用于测定由地球造岩矿物含量差异所导致的地球磁场强度变化……
