Southern Darling Basin Airborne Survey, NSW, 2005 (P1104), 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 Southern Darling Basin Airborne Survey, NSW, 2005 survey were acquired in 2005 by the NSW Government, and consisted of 18763 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）数据可量化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），具体取决于岩石的磁化率。该数据通过标准流程处理，以确保记录的磁场响应仅由地下岩石引起。处理后得到的数据集可通过解译揭示地下地质构造。经处理的数据由GA的地球物理学家开展质量校验，确保GA发布的最终数据满足实际应用需求。本次测线数据集源自2005年新南威尔士州（New South Wales, NSW）达令盆地南部航空测量项目，由新南威尔士州政府于2005年采集完成，涵盖18763测线公里的数据，测线间距为400米，地形离地高度为60米。为约束数据中的长波长分量，项目采用独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据，对本次测量数据的基准水平进行校正。本次测量数据实质上已与AWAGS数据集完成平差校正。