GSWA Lake Grace thorium grid geodetic

This GSWA Lake Grace thorium grid geodetic is an airborne-derived radiometric thorium window countrate grid for the Lake Grace, WA, 1995 survey. The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of thorium (K), uranium (U) and thorium (Th). The data collected 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 Lake Grace thorium grid geodetic has a cell size of 0.00042 degrees (approximately 43m). The data are in units of counts per second (or cps). The data used to produce this grid was acquired in 1995 by the WA Government, and consisted of 4847 line-kilometres of data at 200m line spacing and 60m terrain clearance.

本GSWA莱格雷斯钍网格大地测量数据集是针对西澳大利亚州（WA）莱格雷斯地区1995年勘测项目生成的机载辐射测量钍窗口计数率网格。辐射测量法，亦称伽马射线能谱法，用于测量地球表面附近探测到的伽马射线的自然变化，该变化由钍、钾（K）、铀（U）和钍（Th）的自然放射性衰变产生。所采集的数据将通过标准流程进行处理，以确保记录的响应仅源自地下岩石。最终生成的数据集可通过解译揭示地下地质构造。经处理的数据将由GA的地球物理学家开展质量检查，以确保GA发布的最终数据满足使用需求。
本GSWA莱格雷斯钍网格大地测量数据集的网格单元尺寸为0.00042度（约合43米）。该数据的单位为每秒计数（cps）。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4847线公里的测量数据，测线间距为200米，飞行离地高度为60米。