Hodgkinson-Georgetown Block A, QLD, 1999, Prospectivity Plus Init. (P797), 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 Hodgkinson-Georgetown Block A, QLD, 1999, Prospectivity Plus Init. survey were acquired in 1999 by the QLD Government, and consisted of 93258 line-kilometres of data at a line spacing between 200m and 200m, 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）数据用于表征地壳内造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（磁场强度高于背景值）与负异常（磁场强度低于背景值），其类型取决于岩石的磁化率。该数据通过标准化流程开展处理，以确保记录的磁场响应仅源于地下岩石。处理后生成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地球物理学家进行质量核查，以确保GA发布的最终数据满足使用需求。本次测线数据集源自1999年昆士兰州（QLD）霍奇金森-乔治敦A区块（Hodgkinson-Georgetown Block A）的"远景增效计划（Prospectivity Plus Init.）"航空物探调查，由昆士兰州政府于1999年采集完成，总测线长度达93258线公里，测线间距固定为200米，地形净空高度为80米。为抑制数据中的长波长信号，项目采用独立数据集——全澳航空物探调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——对本次调查数据的基准水平进行校正。本次调查数据已基本基于AWAGS数据完成平差校正。