Southern Yilgarn (Newdegate), WA, 2004 (P1067), 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 Southern Yilgarn (Newdegate, Ravensthorpe, Bremer Bay), WA, 2004 survey were acquired in 2004 by the WA Government, and consisted of 99719 line-kilometres of data at 400m line spacing and 60m 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）数据用于测量地壳中造岩矿物含量差异引起的地球磁场强度变化。磁异常根据岩石的磁化率可分为正异常（磁场强于正常水平）和负异常（磁场弱于正常水平）。数据通过标准方法处理，以确保记录的响应仅来源于地下岩石。处理结果生成的数据集可通过解释揭示地下地质结构。GA地球物理学家会对处理后的数据进行质量检查，确保GA发布的最终数据符合预期用途。

这些来自西澳大利亚州（WA）2004年南伊尔加恩（Southern Yilgarn，含Newdegate、Ravensthorpe、Bremer Bay区域）调查的测线数据集由西澳大利亚州政府于2004年获取，包含99719测线公里的数据，测线间距为400米，地形净空高度为60米。为约束数据中的长波长成分，研究使用了独立的澳大利亚全国航空地球物理调查（AWAGS）航空磁测数据来控制本次调查数据的基准面。本次调查数据本质上已与AWAGS数据进行了水准化处理。