Ashton mag

Total magnetic intensity data measures variations in the intensity of the Earth's magnetic filed caused by the contrasting content of rock-forming minerals in the Earth's crust. The data are collected on airborne geophysical surveys conducted by Commonwealth, State & NT Governments and the private sector.

总磁强度数据（total magnetic intensity data）用于测量地球磁场强度的变化，此类变化由地壳中造岩矿物含量的差异所致。该数据通过联邦、州及北领地政府与私营部门开展的航空地球物理测量（airborne geophysical surveys）收集获取。