NETGOLD - Lisle, NE Tasmania 1983 (P780), 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 NETGOLD - Lisle, NE Tasmania 1983 survey were acquired in 1983 by the TAS Government, and consisted of 1073 line-kilometres of data at 200m line spacing and 70m 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），其类型取决于岩石的磁化率。该数据已通过标准处理流程进行校准，以确保记录的响应仅源于地下岩石。经处理后得到的数据集可通过解译揭示地下地质结构。经处理的数据已由澳大利亚地质调查局（Geoscience Australia, GA）的地球物理学家开展质量核查，以确保GA发布的最终数据满足使用要求。本次测线数据集源自1983年开展的、位于塔斯马尼亚州东北部利斯尔的NETGOLD调查项目，由塔斯马尼亚州政府于1983年采集，总测量长度达1073线公里，测线布设间距为200米，飞行离地高度为70米。为约束数据中的长波长分量，研究人员采用全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）的航空磁测数据作为独立基准数据集，对本次调查数据的基准面进行管控。本调查数据已基本与AWAGS的基准水准对齐。