Amadeus West, NT, 1999 (P1007), 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 Amadeus West, NT, 1999 survey were acquired in 1999 by the NT Government, and consisted of 105340 line-kilometres of data at 400m 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）数据用于测量地壳中成岩矿物含量差异所引发的地球磁场强度波动。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），其类型取决于岩石的磁化率。该数据采用标准流程进行处理，以确保记录的磁场响应仅源自地下岩石。处理后得到的数据集可通过解译揭示地下地质构造。经处理的数据由GA的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需求。本次1999年开展的北领地阿玛迪乌斯西部（Amadeus West, NT）测线调查数据集由北领地政府于1999年完成采集，总测线长度达105340千米，测线间距为400米，飞行离地高度为60米。为约束数据中的长波成分，研究人员采用独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——对本次测线数据的基准水平进行校正。本次测线数据实质上已基于AWAGS数据完成了水准校正。