Kidson AreaB 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 Kidson AreaB 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 1996 by the WA Government, and consisted of 128005 line-kilometres of data at 400m line spacing and 60m terrain clearance.总磁场强度（Total Magnetic Intensity, TMI）数据用于表征地壳中成岩矿物成分差异引发的地球磁场强度变化。磁异常可分为正异常（磁场强度高于正常背景场）与负异常（磁场强度低于正常背景场），分类依据为岩石的磁化率。该数据通过标准流程完成预处理，以确保记录的响应仅源于地下岩石的影响。经处理得到的数据集可用于解译，以揭示地下地质结构。经处理的数据将由GA地球物理学家开展质量核查，确保GA发布的最终数据满足应用需求。本次公开的Kidson AreaB磁测网格大地测量数据，其格网单元尺寸为0.00083度（约89米），数据单位为纳特斯拉（nanoTesla, nT）。用于生成该网格的原始数据由WA Government于1996年采集，总测线里程达128005线公里，测线间距为400米，飞行离地高度为60米。