Albany-Fraser Block (Collie, Pemberton), WA, 1980 (P456), 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 Albany-Fraser Block (Collie, Pemberton), WA, 1980 survey were acquired in 1980 by the WA Government, and consisted of 18835 line-kilometres of data at 1500m line spacing and 150m 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（磁场强度高于正常值）与负异常（磁场强度低于正常值），其分类取决于岩石的磁化率。该数据集通过标准流程处理，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构造。经处理的数据将由GA地球物理学家开展质量核查，以确保GA发布的最终数据符合使用要求。
本批测线数据集源自西澳大利亚州（Western Australia, WA）政府于1980年开展的奥尔巴尼-弗雷泽地块（科利、彭伯顿）科考调查，共包含18835测线公里的数据，测线间距为1500米，飞行离地高度为150米。为约束数据中的长波长成分，研究人员采用独立数据集——澳大利亚全国航空地球物理调查（Airborne Geophysical Survey, AWAGS）航空磁测数据——对本次调查数据的基准水平进行校正。本次调查数据实质上已与AWAGS数据集完成平差校正。