GSWA Merredin Bruce Rock South 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 GSWA Merredin Bruce Rock South magnetic grid geodetic has a cell size of 0.00038 degrees (approximately 39m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 1997 by the WA Government, and consisted of 27533 line-kilometres of data at a line spacing between 150m and 200m, and 50m terrain clearance.

总磁场强度（Total Magnetic Intensity, TMI）数据用于测量由地壳中造岩矿物含量差异引起的地球磁场强度变化。磁异常根据岩石的磁化率可分为正异常（磁场强于正常）或负异常（磁场弱于正常）。数据通过标准方法处理，以确保记录的响应仅由地下岩石引起。处理结果生成的数据集可通过解释揭示地下地质结构。GA地球物理学家会对处理后的数据进行质量检查，确保GA发布的最终数据符合预期用途。

本GSWA Merredin Bruce Rock South地磁格网的像元大小为0.00038度（约39米），单位为纳特斯拉（nanoTesla，nT）。生成该格网所用的数据由西澳大利亚州政府（WA Government）于1997年采集，包含27533线公里的数据，线间距为150米至200米，地形净空高度为50米。