Darling Basin (Menindee), NSW, 1980 (P459), 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 Darling Basin (Menindee), NSW, 1980 survey were acquired in 1980 by the NSW Government, and consisted of 14780 line-kilometres of data at 1500m 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.

总磁场强度（Total Magnetic Intensity, TMI）数据用于表征地壳中成岩矿物组分差异所引发的地球磁场强度变化。磁异常可分为正异常（场强高于正常背景）与负异常（场强低于正常背景），其类型取决于岩石的磁化率。该数据集通过标准流程处理，以确保记录的响应仅源自地下岩石。经处理的数据集可用于解译地下地质构造。本数据集由GA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需求。本测线数据集源自新南威尔士州（New South Wales, NSW）达令盆地（梅林迪）地区1980年航磁测量项目，由新南威尔士州政府于1980年采集，数据总长14780线公里，测线间距1500米，飞行离地高度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）的航磁数据作为基准，对本次测量数据的基准面进行校正，本次测量数据已基本平差至AWAGS基准。