Cobar magnetic and radiometric survey, NSW, 2021 (P5009), Main Area, 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.

总磁强度（Total Magnetic Intensity, TMI）数据可量化由地壳中成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（磁场强度高于正常值）与负异常（磁场强度低于正常值）两类，具体取决于岩石的磁化率。该数据集通过标准流程完成预处理，以确保所记录的响应仅来源于地下岩石。经处理后的数据集可通过解译揭示地下地质结构。经处理的数据将由GA地球物理学家开展质量核查，以确保GA发布的最终数据集符合使用要求。本次测线数据集源自2021年科巴磁测与放射性测量调查项目，由新南威尔士州政府于2021年采集，包含测线间距200米、作业离地高度60米的测线公里数据。