Broken Hill Detail 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 Broken Hill Detail magnetic grid geodetic has a cell size of 0.00021 degrees (approximately 21m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 1994 by the NSW Government, and consisted of 56310 line-kilometres of data at a line spacing between 100m and 400m, and 60m terrain clearance.

总磁场强度（Total Magnetic Intensity, TMI）数据可量化表征由地壳内造岩矿物成分差异引发的地磁场强度变化。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），其类型取决于岩石的磁化率。该数据已通过标准流程处理，确保记录的响应仅由地下岩石产生。处理后生成的数据集可通过解译揭示地下地质构造。经GA地球物理学家开展质量核验，GA发布的最终数据符合使用要求。
本次布罗肯希尔细节大地磁测网格的格网分辨率为0.00021度（约21米），数据单位为纳特斯拉（nanoTesla, nT）。用于生成该网格的数据由新南威尔士州政府于1994年采集，涵盖56310测线公里的实测数据，测线间距介于100米至400米之间，观测离地高度为60米。