Tasmanian Tiers Airborne Magnetic, Radiometric and Digital Elevation Survey, TAS, 2021, (P5003), Block 2, magnetic line data

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 Tasmanian Tiers Magnetic and Radiometric Survey, 2021 survey were acquired in 2021 by the TAS Government, and consisted of 32951 line-kilometres of data at 200m line spacing and 80m terrain clearance.

总磁强度（Total Magnetic Intensity, TMI）数据用于表征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（磁场强度高于正常水平）与负异常（磁场强度低于正常水平），具体取决于岩石的磁化率。该数据采用标准流程进行处理，以确保所记录的磁场响应仅由地下岩石引起。处理后生成的数据集可通过解译，用以揭示地表下的地质结构。经处理的数据会由GA地球物理学家开展质量核验，以确保GA发布的最终数据满足使用要求。本批测线数据集源自2021年塔斯马尼亚地带磁测与放射性测量项目，由塔斯马尼亚州政府（TAS Government）于2021年采集完成，涵盖32951测线公里的数据，测线间距为200米，飞行离地高度为80米。