Kulgera West 1, NT, 1986 (P581), 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 Kulgera West, NT, 1986 survey were acquired in 1986 by the NT Government, and consisted of 14037 line-kilometres of data at 500m line spacing and 100m 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）数据用于测量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（磁场强度高于正常值）与负异常（磁场强度低于正常值），其分类取决于岩石的磁化率。该数据集已通过标准流程处理，确保所记录的磁场响应仅由地下岩石引起。处理后得到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的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使用需求。本次测线数据集源自澳大利亚北领地（Northern Territory, NT）库尔加西地区1986年的航磁调查项目，由北领地政府于1986年采集，总测线长度达14037线千米，测线间距为500米，飞行离地高度为100米。为约束数据中的长波长成分，项目采用了独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——对本次航磁数据的基准水平进行校正。本次航磁数据已基本校正至与AWAGS数据集一致的基准水平。