Goulburn, NSW, 1996 (P650), 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 Goulburn, NSW, 1996 survey were acquired in 1996 by the NSW Government, and consisted of 69424 line-kilometres of data at 250m 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）数据用于测量由地壳内造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（磁场强度高于常规水平）与负异常（磁场强度低于常规水平），其类型取决于岩石的磁化率。该数据通过标准流程处理，以确保记录的响应仅源自地下岩石。处理后得到的数据集可通过解译揭示地下地质结构。经处理的数据会由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要求。本次测线数据集采自1996年新南威尔士州（New South Wales, NSW）古尔本地区的航空磁测项目，由新南威尔士州政府于1996年完成采集，包含69424线公里的数据，测线间距为250米，飞行离地高度为80米。为约束数据中的长波长分量，研究人员采用独立数据集——全澳航空物探调查（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。