NSW DMR, Discovery 2000, 1994-95, AREA A3, Bancannia Trough (P730), 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 NSW DMR, Discovery 2000, 1994-95, AREA A3, Bancannia Trough survey were acquired in 1995 by the NSW Government, and consisted of 21000 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）数据用以表征地壳中成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），其分类取决于岩石的磁化率。该数据集采用标准方法进行处理，以确保记录的磁场响应仅由地下岩石引起。经处理后得到的数据集可通过解译揭示地下地质构造。所有经处理的数据均由GA地球物理学家开展质量核查，以确保GA发布的最终数据满足使用需求。
本次测线数据集源自新南威尔士州矿产资源局（NSW DMR）1994-1995年“Discovery 2000”项目A3区班坎尼亚海槽调查任务，由新南威尔士州政府于1995年采集完成，总测线长度达21000线公里，测线间距为400米，地形离地高度为80米。为约束数据中的长波长分量，项目采用独立数据集——澳大利亚全域航空地球物理调查（Airborne Geophysical Survey, AWAGS）航空磁数据——对本次调查数据的基准水平进行校正。本次调查数据已基本匹配AWAGS基准。