Coonabarabran Airborne Magnetic Radiometric and DEM Survey, NSW, 2017 (P1290), 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 Coonabarabran Airborne Magnetic Radiometric and DEM Survey, NSW, 2017 survey were acquired in 2017 by the NSW Government, and consisted of 50961 line-kilometres of data at 250m line spacing and 60m terrain clearance.

总磁场强度（Total Magnetic Intensity, TMI）数据用于量化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（磁场强度高于正常水平）与负异常（磁场强度低于正常水平），其类型取决于岩石的磁化率。该数据通过标准化处理流程进行加工，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地质解译揭示地下地质构造。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发布的最终数据符合使用需求。本次测线数据集源自2017年新南威尔士州（New South Wales, NSW）库纳巴拉布兰航空磁辐射测量与数字高程模型（Digital Elevation Model, DEM）调查项目，由新南威尔士州政府于2017年完成采集，总测线里程达50961测线公里，测线间距为250米，飞行离地高度为60米。