GSNSW Exploration NSW Area Q Wagga Wagga 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 GSNSW Exploration NSW Area Q Wagga Wagga magnetic grid geodetic has a cell size of 0.00049 degrees (approximately 50m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 2000 by the NSW Government, and consisted of 31696 line-kilometres of data at 250m line spacing and 70m terrain clearance.

总磁强度（Total Magnetic Intensity, TMI）数据用于量化表征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（磁场强度高于常规水平）与负异常（磁场强度低于常规水平），其类型取决于岩石的磁化率。该数据通过标准化流程开展处理，以确保记录的响应仅来源于地下岩石。处理后得到的数据集可通过地质解译揭示地下地质构造。经处理的数据由GA地球物理学家进行质量核查，以保障GA发布的最终数据满足使用需求。本数据集为GSNSW新南威尔士州勘探区Q沃加沃加大地磁网格数据，其格网单元尺寸为0.00049度（约50米），数据单位为纳特斯拉（nanoTesla, nT）。本网格数据由新南威尔士州（NSW）政府于2000年采集获取，原始数据总长31696线公里，线间距为250米，地形离地高度为70米。