Arthur-Pieman Area, NW Tasmania, TAS, 1996 (P652), 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 Arthur-Pieman Area, NW Tasmania, TAS, 1996 survey were acquired in 1996 by the TAS Government, and consisted of 17093 line-kilometres of data at a line spacing between 100m and 100m, and 90m 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中成岩矿物含量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进行处理，以确保所记录的响应仅源于地下岩石。经处理得到的数据集可通过解译揭示地下地质构造。经处理后的数据集需由GA的地球物理学家开展质量核查，以确保GA发布的最终数据符合使用需求。

本次航线数据集源自塔斯马尼亚州西北部亚瑟-皮耶曼地区（Arthur-Pieman Area）1996年的科考项目，于1996年由塔斯马尼亚州政府（TAS Government）采集完成，总航线覆盖长度达17093千米，航线间距为100米至100米，飞行地形净空高度为90米。为约束数据中的长波长成分，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——对本次科考数据的基准水平进行校正。本次科考数据实质上已与AWAGS数据集完成平差处理。