Merlinleigh 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 Merlinleigh magnetic grid geodetic has a cell size of 0.001 degrees (approximately 106m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 1995 by the WA Government, and consisted of 45278 line-kilometres of data at 500m line spacing and 80m terrain clearance.

总磁场强度（Total Magnetic Intensity, TMI）数据用于测量由地壳内造岩矿物成分差异所引发的地球磁场强度变化。根据岩石磁化率的不同，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。该数据已通过标准流程处理，确保记录的响应仅来源于地下岩石。经处理后得到的数据集可通过解译揭示地下地质构造。GA地球物理学家已对处理后的数据开展质量核查，以确保GA发布的最终数据满足使用要求。
本次的梅林莱大地测量磁网格（Merlinleigh magnetic grid geodetic）格网单元尺寸为0.001度（约合106米），数据单位为纳特斯拉（nanoTesla, nT）。用于生成该网格的数据由西澳大利亚州政府于1995年采集，涵盖总计45278线公里的测线数据，测线间距为500米，地形离地高度为80米。