GSNSW Exploration NSW Area T Moree magnetic first vd 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 GSNSW Exploration NSW Area T Moree magnetic first vd grid geodetic is a first vertical derivative of the Total Magnetic Intensity grid for the NSW DMR, Discovery 2000, AREA T, MOREE, NSW 2001.This grid has a cell size of 0.00077 degrees (approximately 80m). The grid has units of nanoTesla per km (or nT/km). The data used to produce the TMI grid was acquired in 2001 by the NSW Government, and consisted of 29063 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）数据用于测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。依据岩石的磁化率差异，磁异常可划分为正异常（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）。该数据经标准化流程处理，以确保记录得到的响应仅源自地下岩石。经处理所得数据集可通过解译工作揭示地下地质构造。经处理的数据由GA地球物理学家开展质量核验，以确保GA发布的最终数据满足使用要求。
本数据集为新南威尔士州地质调查局（GSNSW）莫里地区T勘探区的磁学一阶垂直导数大地测量网格，系针对新南威尔士州矿产资源部（NSW DMR）2001年莫里地区"Discovery 2000"项目T区域的总磁场强度网格计算得到的一阶垂直导数网格。
该网格的单元尺寸为0.00077度（约合80米）。
该网格的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数据由新南威尔士州政府于2001年采集，涵盖29063线千米的观测数据，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）流程对原始网格进行处理，以计算得到该一阶垂直导数网格。