SA Exploration Initiative 1995 - Area B17 (P705), 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 SA Exploration Initiative 1995 - Area B17 survey were acquired in 1995 by the SA Government, and consisted of 36821 line-kilometres of data at 400m line spacing and 80m terrain clearance.

总磁强度（Total Magnetic Intensity，TMI）数据测量地壳中造岩矿物含量差异引起的地球磁场强度变化。磁异常可分为正异常（磁场强于正常水平）或负异常（磁场弱于正常水平），具体取决于岩石的磁化率。数据通过标准方法处理，以确保记录的响应仅源于地下岩石。处理结果生成的数据集可通过解释揭示地下地质结构。处理后的数据由GA地球物理学家进行质量检查，以确保GA发布的最终数据符合预期用途。这些来自1995年SA勘探计划-B17区域调查的测线数据集由SA政府于1995年获取，包含36821测线公里的数据，测线间距为400米，地形净空高度为80米。