Cobar P5009 Main total magnetic intensity grid

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 Cobar P5009 Main total magnetic intensity grid has a cell size of 0.00039074 degrees (approximately 40m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 2021 by the NSW Government, and consisted of 53617 line-kilometres of data at 200m line spacing and 60m terrain clearance.

总磁强度（Total magnetic intensity, TMI）数据用于测量由地壳中造岩矿物含量差异引起的地球磁场强度变化。根据岩石的磁化率，磁异常可分为正异常（磁场强于正常值）或负异常（磁场弱于正常值）。数据通过标准方法处理，以确保记录的响应仅来源于地下岩石。处理结果生成的数据集可通过解释揭示地下地质结构。GA的地球物理学家会对处理后的数据进行质量检查，确保GA发布的最终数据符合预期用途。该Cobar P5009主总磁强度网格的单元格大小为0.00039074度（约40米）。单位为纳特斯拉（nanoTesla，nT）。生成该网格所用的数据由新南威尔士州政府（NSW Government）于2021年采集，包含53617线公里的数据，线间距为200米，地形净空高度为60米。