Alcoota/Alice Springs h, 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.

总磁强度（Total Magnetic Intensity, TMI）数据用于测量地壳内造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（磁场强度高于正常水平）与负异常（磁场强度低于正常水平），具体取决于岩石的磁化率。该数据经标准流程处理，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地质解译揭示地下地质结构。GA的地球物理学家会对经处理的数据开展质量核验，以确保GA发布的最终数据满足应用需求。
本次1997年澳大利亚北领地（Northern Territory, NT）Alcoota/Alice Springs地区的测线数据集，由北领地政府于1997年采集完成，总测线长度达132674线公里，测线间距为400米，飞行地形离地高度为60米。为约束数据中的长波长分量，研究人员采用了独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）的航空磁测数据，对本次调查数据的基准水平进行校正。本次调查数据实质上已基于AWAGS数据完成平差校正。