Taltingan 1 100k 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 Taltingan 1 100k 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.

总磁强度（Total Magnetic Intensity, TMI）数据用于测量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（磁场强度高于基准值）与负异常（磁场强度低于基准值），其类型取决于岩石的磁化率。该数据通过标准流程进行处理，以确保记录的响应仅源于地下岩石。处理后生成的数据集可通过解译揭示地下地质构造。经处理的数据会由GA的地球物理学家开展质量核验，以确保GA发布的最终数据符合使用要求。本Taltingan 1 100k磁测网格大地测量数据集的网格单元尺寸为0.00021度（约21米），数据单位为纳特斯拉（nanoTesla，简称nT）。本网格的数据由新南威尔士州政府于1994年采集，总测线长度达56310千米，测线间距介于100米至400米之间，地形离地高度为60米。