NETGOLD - Pipers River, TAS, 1993 (P783), 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 - Fingal, Pipers River, Mt.Horror, TAS, 1993 survey were acquired in 1993 by the TAS Government, and consisted of 16797 line-kilometres of data at 200m 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.

总磁场强度（Total magnetic intensity, TMI）数据用于表征由地壳内造岩矿物组分差异引发的地磁场强度变化。依据岩石磁化率的差异，磁异常可分为正异常（场强高于正常地磁场）与负异常（场强低于正常地磁场）两类。本数据集通过标准流程开展处理，以确保记录的响应仅源于地下岩石，最终生成可用于解译地下地质结构的数据集。GA地球物理学家会对处理后的数据进行质量核查，以确保GA发布的最终数据符合使用要求。本次测线数据集源自1993年在塔斯马尼亚州芬加尔、派珀斯河、霍勒山开展的NETGOLD调查，由塔斯马尼亚州政府于1993年采集，总测线长度达16797线公里，测线间距为200米，地形净空高度为80米。为约束数据中的长波长分量，研究采用了独立数据集——全国航空地球物理调查（Airborne Geophysical Survey, AWAGS）的航空磁测数据，对本次调查数据的基准面进行控制，本调查数据已基本平差至AWAGS基准。