Tallaringa North ? magnetic line data (AWAGS)

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 Tallaringa North Airborne Magnetic Radiometric and DEM Survey, SA, 2017 survey were acquired in 2017 by the SA Government, and consisted of 98230 line-kilometres of data at 200m line spacing and 60m terrain clearance. To constrain long wavelengths in the data, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey data. This survey data is essentially levelled to AWAGS.总磁场强度（Total Magnetic Intensity, TMI）数据用于衡量由地壳中成岩矿物含量差异引发的地球磁场强度变化。磁异常可分为正异常（磁场强度高于正常值）与负异常（磁场强度低于正常值），具体取决于岩石的磁化率。该数据通过标准处理流程开展预处理，以确保记录的磁场响应仅源于地下岩石。处理后得到的数据集可通过地质解译揭示地下地质结构。经处理的数据由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要求。本次2017年南澳大利亚州塔拉里加北航空磁测、放射性测量与数字高程模型（Digital Elevation Model, DEM）调查所产出的测线数据集，由南澳大利亚州政府于2017年采集完成，总测线长度达98230公里，测线间距为200米，飞行离地高度为60米。为约束数据中的长波长分量，本次调查采用独立数据集——全澳航空地球物理调查（Airborne Geophysical Survey, AWAGS）航空磁测数据——来校准本次调查数据的基准水平。本次调查数据实质上已与AWAGS数据集完成平差校正。