Curnamona magnetic grid geodetic

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.This Curnamona magnetic grid geodetic has a cell size of 0.00083 degrees (approximately 86m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 1995 by the SA Government, and consisted of 62542 line-kilometres of data at a line spacing between 100m and 400m, and 60m terrain clearance.

总磁强度（Total Magnetic Intensity, TMI）数据用于测量由地壳中成岩矿物含量差异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。该数据通过标准化流程进行处理，以确保记录的响应仅源自地下岩石。处理后得到的数据集可通过解译揭示地下地质构造。经处理的数据由GA的地球物理学家进行质量核验，以确保GA发布的最终数据符合使用要求。本次发布的库纳莫拉（Curnamona）大地测量磁网格数据的单元尺寸为0.00083度（约86米）。数据单位为纳特斯拉（nanoTesla, nT）。用于生成该网格的数据由南澳大利亚政府于1995年采集，总测线长度达62542线公里，测线间距介于100米至400米之间，飞行离地高度为60米。