Wiso Basin trav03, NT, 2000 (P1015), 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 Wiso Basin, NT, 2000 survey were acquired in 2000 by the NT Government, and consisted of 113520 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）数据用于表征地壳中成岩矿物含量差异所引发的地球磁场强度变化。磁异常可分为正异常（磁场强度高于正常水平）与负异常（磁场强度低于正常水平），其类型取决于岩石的磁化率。本数据集经标准处理流程处理，确保记录的地球磁场响应仅源自地下岩体。经处理得到的数据集可用于解译地下地质构造。经处理后的数据需由GA地球物理学家开展质量核验，以确保GA发布的最终数据符合使用要求。本次测线数据集源自北领地（Northern Territory, NT）威索盆地（Wiso Basin）2000年航空磁测项目，由北领地政府于2000年采集完成，总测线长度达113520线公里，测线间距为400米，地形离地高度为80米。为约束数据中的长波长成分，研究人员采用全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁数据作为独立参考数据集，对本次测线数据的基准面进行校正，本次调查数据已基本匹配AWAGS的基准面。