GSQ Northern Bowen Basin Qld 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 Northern Bowen Basin Qld magnetic grid geodetic has a cell size of 0.00096 degrees (approximately 103m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 2002 by the QLD Government, and consisted of 59476 line-kilometres of data at 400m line spacing and 80m terrain clearance.

总磁场强度（Total Magnetic Intensity, TMI）数据用于衡量由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（磁场强度高于正常水平）与负异常（磁场强度低于正常水平），其分类取决于岩石的磁化率。该数据经标准流程处理，以确保记录的磁场响应仅源自地下岩石。处理后得到的数据集可通过地质解译揭示地下地质构造。经处理的数据会由GA地球物理学家开展质量核查，以确保GA发布的最终数据满足使用需求。本数据集为昆士兰州地质调查局（Geological Survey of Queensland, GSQ）北鲍恩盆地大地测量磁网格，其格网单元尺寸为0.00096度（约103米）。数据单位为纳特斯拉（nanoTesla, 简称nT）。本网格所用数据由昆士兰州政府于2002年采集，总测线长度达59476测线公里，测线间距为400米，地形离地高度为80米。