MRTAS Flinders Island 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 MRTAS Flinders Island magnetic grid geodetic has a cell size of 0.00042 degrees (approximately 41m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 2007 by the TAS Government, and consisted of 18426 line-kilometres of data at 200m line spacing and 90m terrain clearance.

总磁场强度（Total magnetic intensity, TMI）数据用于表征地壳内造岩矿物成分差异引发的地磁场强度变化。磁异常可依据磁场强弱分为正异常（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。本数据集通过标准流程完成处理，确保记录的磁场响应仅由地下岩石引起。经处理后的数据可通过解译揭示地下地质构造。GA地球物理学家会对处理后的数据进行质量核查，以保障GA发布的最终数据满足使用需求。
本MRTAS弗林德斯岛大地测量磁网格的格网单元尺寸为0.00042度（约合41米），数据单位为纳特斯拉（nanoTesla, nT）。该网格的数据由塔斯马尼亚州政府于2007年采集，原始数据涵盖总长度18426公里的测线数据，测线间距为200米，地形离地高度为90米。