Georgina SE, NT, 2002 (P1022), 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 Georgina, NT, 2002 survey were acquired in 2002 by the NT Government, and consisted of 108159 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（磁场强度高于正常背景）与负异常（磁场强度低于正常背景），其类型取决于岩石的磁化率。本数据集通过标准处理流程开展处理，以确保所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。经处理的数据已由GA地球物理学家完成质量核查，确保GA发布的最终数据完全满足使用需求。该套测线数据集源自2002年北领地乔治金地区的磁测项目，由北领地政府于2002年采集完成，总测线长度达108159测线公里，测线间距为400米，采集时地形离地高度为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——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据，对本次调查数据的基准电平进行校正。本次调查数据已基本平差至AWAGS基准。