Cobar P5009 EXT 2 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 EXT 2 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）数据用于表征地壳内造岩矿物组分差异所引发的地球磁场强度变化。磁异常可分为正异常（磁场强度高于基准值）与负异常（磁场强度低于基准值），具体取决于岩石的磁化率。该数据已通过标准处理流程进行处理，以确保所记录的磁场响应仅来源于地下岩石。处理后得到的数据集可通过地质解译揭示地下地质构造。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实际应用需求。本Cobar P5009 EXT 2总磁强度网格数据的网格单元尺寸为0.00039074度（约合40米），数据单位为纳特斯拉（nanoTesla, nT）。用于生成该网格的原始数据由新南威尔士州政府（NSW Government）于2021年采集，总测线长度达53617线公里，测线间距为200米，飞行离地高度为60米。