GSQ Charters Towers Clermont 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 GSQ Charters Towers Clermont magnetic grid geodetic has a cell size of 0.00083 degrees (approximately 89m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 1987 by the QLD Government, and consisted of 40255 line-kilometres of data at 400m line spacing and 60m terrain clearance.总磁强度（Total Magnetic Intensity, TMI）数据用于量化地壳中成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（磁场强度高于正常值）与负异常（磁场强度低于正常值），具体取决于岩石的磁化率。该数据已通过标准处理流程进行处理，以确保记录的磁场响应仅由地下岩石引起。经处理得到的数据集可通过解译揭示地下地质构造。处理后的数据已由澳大利亚地球科学局（Geoscience Australia, GA）的地球物理学家开展质量核查，以确保GA发布的最终数据符合使用要求。 本昆士兰州地质调查局（Geological Survey of Queensland, GSQ）查特斯堡-克莱蒙磁网格大地测量数据集的网格单元大小为0.00083度（约89米），数据单位为纳特斯拉（nanoTesla, nT）。 用于生成该网格的数据由昆士兰州（Queensland, QLD）政府于1987年采集，总测线长度达40255线公里，测线间距为400米，地形离地高度为60米。