Texas, Qld, 1996,AIRDATA (P792), 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 Texas, Qld, 1996,AIRDATA survey were acquired in 1996 by the QLD Government, and consisted of 38986 line-kilometres of data at 400m 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.

总磁强度（Total Magnetic Intensity, TMI）数据可表征由地壳内造岩矿物组分差异引发的地球磁场强度变化。根据岩石磁化率的差异，磁异常可分为正异常（磁场强度高于正常背景值）与负异常（磁场强度低于正常背景值）两类。本数据集通过标准流程开展处理，确保记录的地球物理响应仅源于地下岩石，处理后生成的数据集可用于解译地下地质结构。经GA地球物理学家开展质量核查，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1996年得克萨斯州、昆士兰州（Queensland, Qld）的AIRDATA航空调查，由昆士兰州政府于1996年采集完成，涵盖38986测线公里的数据，测线间距为400米，飞行离地高度为80米。为约束数据中的长波长分量，研究采用独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）的航空磁测数据，对本次调查数据的基准面进行校正控制，本次调查数据已基本基于AWAGS完成基准面平差校正。