Sturt - Dry River, NT, 2001 (P1021), 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 Sturt, NT, 2001 survey were acquired in 2001 by the NT Government, and consisted of 45990 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（磁场强度高于正常背景）与负异常（磁场强度低于正常背景），具体取决于岩石的磁化率。该数据经标准处理流程加工，以确保记录的响应仅来源于地下岩石。经处理得到的数据集可通过解译，揭示地下地质结构。相关成果经GA（Geoscience Australia）地球物理学家开展质量核查，确保GA发布的最终数据符合使用要求。该批测线数据集源自2001年北领地（Northern Territory, NT）Sturt地区的航空磁测项目，由北领地政府于2001年完成采集，包含总长度45990线公里的测线数据，测线布设间距为400米，飞行离地高度为80米。为约束数据中的长波长成分，本次调查采用独立数据集——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——来控制本次测线数据的基准面，本项目采集的数据已基本匹配AWAGS基准。