Adavale Qld, (Geomap 2005) GDI 1997/1998 (P795), 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 Adavale Qld, (Geomap 2005) GDI 1997/1998 survey were acquired in 1998 by the QLD Government, and consisted of 174490 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.

总磁场强度（Total Magnetic Intensity, TMI）数据用于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），其分类取决于岩石的磁化率。该数据集通过标准流程进行处理，以确保记录的响应仅源于地下岩石。处理后得到的数据集可用于解译，以揭示地下地质构造。经处理的数据由GA地球物理学家开展质量检查，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昆士兰州（Queensland, QLD）阿达瓦利地区的《Geomap 2005》及GDI 1997/1998科考项目，由昆士兰州政府于1998年完成采集，总测线长度达174490线公里，测线间距为400米，离地高度为80米。为压制数据中的长波长信号，研究人员采用澳大利亚全国航空地球物理调查（Airborne Geophysical Survey, AWAGS）的航空磁测数据作为独立数据集，对本次科考数据的基准面进行校正。本次科考数据实质上已匹配AWAGS数据集完成平差处理。