Cobar magnetic and radiometric survey, NSW, 2021 (P5009), Extension 2, magnetic line data

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. These line dataset from the Cobar Magnetic and Radiometric Survey, 2021 survey were acquired in 2021 by the NSW Government, and consisted of line-kilometres of data at 200m line spacing and 60m terrain clearance.

总磁场强度（Total Magnetic Intensity, TMI）数据用于表征地壳内造岩矿物成分差异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），其类型取决于岩石的磁化率。本数据集通过标准化流程开展处理，以确保所记录的响应仅由地下岩石引起。经处理得到的数据集可通过解译揭示地下地质结构。处理后的数据会由GA地球物理学家进行质量核验，以保障GA发布的最终数据满足使用需求。本次所用的线数据集源自2021年科巴磁测与放射性测量调查项目，该项目于2021年由新南威尔士州政府（NSW Government）实施，采集了按200米测线间距、60米地形离地高度获取的测线公里级数据。