Alcoota/Alice Springs, NT, 1997 (P1003), 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 Alcoota/Alice Springs, NT, 1997 survey were acquired in 1997 by the NT Government, and consisted of 132674 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）数据用于量化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（磁场强度高于正常值）与负异常（磁场强度低于正常值）两类，其类型取决于岩石的磁化率。本数据集通过标准处理方法完成处理，确保记录的场响应仅源于地下岩石。经处理后得到的数据集可用于解译，以揭示地下地质构造。GA地球物理学家已对处理后的数据开展质量核查，确保GA发布的最终数据符合使用要求。这套1997年北领地（NT）阿尔库塔/爱丽斯泉测线数据集由北领地政府于1997年采集，包含132674线公里的实测数据，测线间距为400米，地形离地高度为60米。为抑制数据中的长波长信号，本次研究采用独立数据集——全澳航空物探调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据，作为本次测线数据的基准面控制依据。本次测线数据本质上已校准至AWAGS基准。