GSWA Devils Creek Magnetic Grid Geodetic

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 crust. Magnetic anomalies can be either positive (field stronger than normal) or negative (field weaker) depending on the susceptibility of the rock. The data are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.This GSWA Devils Creek Magnetic Grid Geodetic has a cell size of 0.00083 degrees (approximately 84m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 1999 by the WA Government, and consisted of 3935 line-kilometres of data at 300m line spacing and 70m terrain clearance.

总磁强度（Total Magnetic Intensity, TMI）数据用于表征由地壳内造岩矿物成分差异所引发的地球磁场强度变化。磁异常可分为正异常（磁场强度高于正常水平）与负异常（磁场强度低于正常水平），具体取决于岩石的磁化率。该数据通过标准化流程进行处理，以确保所记录的响应仅源于地下岩石。处理后得到的数据集可通过解译，揭示地下地质结构。经处理的数据已由GA地球物理学家开展质量核查，以确保GA发布的最终数据符合使用要求。本GSWA Devils Creek磁网格大地测量数据集的单元格大小为0.00083度（约84米），数据单位为纳特斯拉（nanoTesla, nT）。用于生成该网格的数据由西澳政府（WA Government）于1999年采集，数据总长3935测线千米，测线间距为300米，地形离地高度为70米。