GSQ Munduberra 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 Munduberra Qld magnetic vd1 grid geodetic is a first vertical derivative of the Total Magnetic Intensity grid for the Rockhampton 1 & 2, Monto & Munduberra, 1994-1995, Qld,AIRDATA.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 1994 by the QLD Government, and consisted of 156236 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（磁场强度高于正常值）与负异常（磁场强度低于正常值）两类，其分类依据为岩石的磁化率。该数据已通过标准化流程处理，以确保所记录的磁场响应仅源自地下岩石。经处理得到的数据集可通过解译揭示地下地质构造。GA地球物理学家会对经处理后的数据开展质量核查，以确保GA发布的最终数据符合使用要求。本GSQ昆士兰州蒙杜贝拉磁一阶垂直导数大地测量网格，是1994-1995年昆士兰州洛坎普顿1号、2号区块及蒙托与蒙杜贝拉区域航空航磁数据（AIRDATA）对应的总磁场强度网格的一阶垂直导数产品。该网格的单元尺寸为0.00096度（约合102米），单位为纳特斯拉每千米（nT/km）。生成该总磁场强度网格所用的原始数据由昆士兰州政府于1994年采集，数据总测线长度达156236千米，测线间距为400米，飞行离地高度为80米。研究人员对原始总磁场强度网格应用快速傅里叶变换（Fast Fourier Transform，FFT）流程，以计算得到该一阶垂直导数网格。