East Mount Isa - North, Qld, 2007 (P1144), 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 East Mount Isa - North, Qld, 2007 survey were acquired in 2007 by the QLD Government, and consisted of 112910 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（TMI）数据可测量由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），其类型取决于岩石的磁化率。该数据已采用标准方法进行处理，以确保记录的响应仅由地下岩体产生。处理后生成的数据集可通过解译揭示地下地质结构。经处理的数据已由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应用需求。本次测线数据集源自2007年开展的东芒特艾萨北部，昆士兰州（Qld）调查，由昆士兰州政府于2007年采集，数据总长为112910测线千米，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成分，本次调查采用澳大利亚全域航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）的航空磁数据作为独立数据集，以调控本次调查数据的基准面。本次调查数据已基本调平至AWAGS基准面。