SMMSP - MagSpec - Angas Bremer Plains, SA, 2002 (2002/01) (P909), 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 SMMSP - MagSpec - Angas Bremer Plains, SA, 2002 (2002/01) survey were acquired in 2002 by the SA Government, and consisted of 7535 line-kilometres of data at 100m 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.

总磁强度（Total Magnetic Intensity, TMI）数据可用于测量由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），具体取决于岩石的磁化率。该数据集通过标准化方法开展处理，以确保记录的响应仅源自地下岩石。经处理得到的数据集可通过解译揭示地下地质结构。经处理的数据由GA地球物理学家进行质量核查，以确保GA发布的最终数据符合使用要求。本次航带数据集由南澳大利亚州（South Australia, SA）政府于2002年采集，源自SMMSP-MagSpec-Angas Bremer Plains航空测量项目（2002/01），共包含7535航带公里的航磁数据，航带间距为100米，地形离地高度为60米。为约束数据中的长波长分量，本次测量采用独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——对航测数据的基准水平进行校正。本次航测数据已基本匹配AWAGS基准。