GSQ Central Bowen Basin Qld magnetic vd1 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 Central Bowen Basin Qld magnetic vd1 grid geodetic is a first vertical derivative of the Total Magnetic Intensity grid for the Central Bowen Basin, Qld, 2003.This grid has a cell size of 0.00096 degrees (approximately 102m). The grid has units of nanoTesla per km (or nT/km). The data used to produce the TMI grid was acquired in 2003 by the QLD Government, and consisted of 65476 line-kilometres of data at 400m line spacing and 80m terrain clearance. A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid.

总磁场强度（Total Magnetic Intensity, TMI）数据用于量化表征地壳内造岩矿物组分差异所引发的地球磁场强度波动。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）两类，具体取决于岩石的磁化率。该数据通过标准化处理流程进行加工，以确保记录的磁场响应仅源于地下岩石的影响。经处理得到的数据集可通过解译揭示地下地质构造。处理后的数据将由GA地球物理学家开展质量核验，以保障GA发布的最终数据符合使用要求。本GSQ昆士兰州中央鲍恩盆地磁学vd1大地测量网格，为2003年昆士兰州中央鲍恩盆地总磁场强度网格的一阶垂直导数产品。该网格的单元格分辨率为0.00096度（约102米），单位为纳特斯拉每千米（nT/km）。用于生成该总磁场强度网格的原始数据由昆士兰州政府于2003年采集，涵盖65476线千米的航磁数据，测线间距为400米，地形离地高度为80米。研究人员通过快速傅里叶变换（Fast Fourier Transform, FFT）算法对原始总磁场强度网格进行处理，计算得到本次发布的一阶垂直导数网格。