TEISA - Area A8, SA, 1999 (P2008), magnetic line data, AWAGS levelled

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 TEISA - Area A8, SA, 1999 survey were acquired in 1999 by the SA Government, and consisted of 1350 line-kilometres of data at 400m line spacing and 80m 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）数据用于测量地壳内造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（磁场强度高于正常水平）与负异常（磁场强度低于正常水平），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质控，以确保记录的磁场响应仅源于地下岩石。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发布的最终数据满足使用需求。本次采用的测线数据集源自1999年开展的TEISA-A8区（SA）航磁测量，由南澳州政府于1999年完成数据采集，测线总长1350测线千米，线间距为400米，飞行离地高度为80米。为约束数据中的长波长区域场分量，项目引入独立数据集——全澳航空地球物理调查（Airborne Geophysical Survey, AWAGS）航磁数据，对本次测量数据的基准水平进行校正。本次测量数据已基于AWAGS完成基准平差。