Trayning, WA, 1997 (P1068), 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 Trayning, WA, 1997 survey were acquired in 1997 by the WA Government, and consisted of 12657 line-kilometres of data at 150m line spacing and 50m 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（磁场强度高于正常背景场）与负异常（磁场强度低于正常背景场），其类型取决于岩石的磁化率。该数据已通过标准处理流程开展校正，以确保记录的响应仅源于地下岩体。处理后得到的数据集可通过解译揭示地下地质构造。经处理的数据已由GA地球物理学家完成质量核查，以确保GA发布的最终数据符合使用要求。
本次1997年西澳大利亚州特雷宁（Trayning, WA）调查获取的测线数据集，由西澳大利亚州政府于1997年采集完成，总测线长度达12657线公里，测线间距为150米，航空测量离地高度为50米。为约束数据中的长波成分，研究人员采用澳大利亚全域航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）的航空磁测数据作为独立参考数据集，对本次调查数据的基准面进行校正。本次调查数据实质上已参照AWAGS数据完成基准面平差。