TEISA - Area D (D1-D3), SA, 1999 (P853), 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 TEISA - Area D (D1-D3), SA, 1999 survey were acquired in 1999 by the SA Government, and consisted of 52087 line-kilometres of data at 400m line spacing and 80m terrain clearance.

总磁强度（Total Magnetic Intensity, TMI）数据用于测量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。该数据通过标准流程处理，以确保所记录的响应仅源于地下岩石。处理后得到的数据集可通过解译揭示地下地质构造。经处理的数据将由GA的地球物理学家开展质量核查，以确保GA发布的最终数据符合使用要求。本次1999年勘测的测线数据集源自TEISA-D区（D1-D3）、南澳（SA），由南澳州政府于1999年采集，总测线长度达52087线千米，测线间距为400米，飞行离地高度为80米。