Tanami,The Granites, NT, 1962 (P255), 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 Tanami,The Granites, NT, 1962 survey were acquired in 1962 by the NT Government, and consisted of 24345 line-kilometres of data at 1600m line spacing and 150m 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）数据用于表征地壳中成岩矿物组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。该数据集通过标准处理流程进行处理，以确保记录的响应仅来源于地下岩石；经处理后得到的数据集可通过解译，揭示地下地质构造。经处理的数据由澳大利亚地质调查局（Geoscience Australia, GA）的地球物理学家开展质量核验，确保GA发布的最终数据符合使用要求。
本次测线数据集源自1962年北领地（Northern Territory, NT）塔纳米花岗岩（The Granites）地区的航磁调查，由北领地政府于1962年采集，总测线长度达24345测线公里，测线布设间距为1600米，飞行离地高度为150米。为约束数据中的长波长分量，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——对本次航磁数据的基准水平进行校正。本次调查数据实质上已基于AWAGS数据完成基准统一平差。