Alice Springs Region - Simpson Desert North 1, NT, 2003 (P1024), 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 Alice Springs Region - Simpson Desert North, NT, 2003 survey were acquired in 2003 by the NT Government, and consisted of 52000 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.

总磁强度（Total Magnetic Intensity, TMI）数据用于测量由地壳内造岩矿物含量差异所引发的地球磁场强度变化。磁异常可分为正异常（磁场强度高于正常值）与负异常（磁场强度低于正常值），具体取决于岩石的磁化率。该数据集通过标准流程进行处理，以确保所记录的磁场响应仅由地下岩石引起。经处理后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的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要求。
本次测线数据集源自2003年北领地（NT）艾丽斯斯普林斯地区——辛普森沙漠北部的航磁测量项目，由北领地政府于2003年采集完成，涵盖52000测线公里的数据，测线间距为400米，飞行离地高度为80米。为约束数据中的长波长分量，项目采用独立数据集——澳大利亚全域航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——对本次航磁测量数据的基准值进行校正。本次测量数据已基本校准至AWAGS基准。