GSNSW Exploration NSW Area P Narrabri 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 P Narrabri magnetic grid geodetic has a cell size of 0.00096 degrees (approximately 100m). 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 43190 line-kilometres of data at 400m line spacing and 80m terrain clearance.

总磁场强度（Total magnetic intensity, TMI）数据用于表征地壳内造岩矿物成分差异所引发的地磁场强度变化。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），其类型取决于岩石的磁化率。该数据集通过标准处理流程进行加工，以确保记录的响应仅源于地下岩石。处理后得到的数据集可通过解译揭示地下地质结构。所有处理后的数据均由澳大利亚地球科学局（GA）的地球物理学家开展质量核验，以保障GA发布的最终数据符合使用要求。本次的新南威尔士州地质调查局（Geological Survey of New South Wales, GSNSW）勘探区P纳拉布里磁大地测量网格，其网格单元尺寸为0.00096度（约100米），数据单位为纳特斯拉（nanoTesla, nT）。用于生成该网格的数据由新南威尔士州政府于2000年采集，总测线长度达43190线公里，测线间距为400米，采集时的地形离地高度为80米。