GSV Maffra VIMP Vic pot tho ura totg 4band radiometric grid geodetic

This GSV Maffra VIMP Vic pot tho ura totg 4band radiometric grid geodetic is an airborne-derived radiometric Potassium, Thorium and Uranium data over a sun shaded total count radiometric data for the Maffra, Vic, 2000 VIMP Survey (GSV3170). 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 uranium (K), uranium (U) and uranium (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 GSV Maffra VIMP Vic pot tho ura totg 4band radiometric grid geodetic has a cell size of 0.0005 degrees (approximately 49m). The data used to produce this grid was acquired in 2000 by the VIC Government, and consisted of 12489 line-kilometres of data at 200m line spacing and 80m terrain clearance. The grid was produced by applying the colours red to the Potassium ground concentration, green to the Thorium concentration and blue to the Uranium concentration. The colours were clipped to a 99% linear scale. These colours were transparent over a shaded Total Count. This clipping will necessarily introduce some artefacts into the ratio grids in areas of very low radioelement concentrations. The 3-band image was superposed on the sun shaded TC grid of the same survey to produce the final image.

本数据集为维多利亚州马弗拉（Maffra）地区2000年VIMP航空物探测量（编号GSV3170）的4波段放射测量大地网格数据，涵盖航空获取的钾（K）、钍（Th）、铀（U）放射能数据，并叠加了阴影化的总计数放射能图层。放射测量即伽马射线能谱法，通过探测地表附近的伽马射线自然变化量，反映钾（K）、钍（Th）和铀（U）的天然放射性衰变产生的辐射信号。所采集的数据均通过标准流程处理，以确保记录的响应仅源于地下岩石的辐射信号。处理后得到的数据集可用于解译，以揭示地下地质构造。经处理的数据会由澳大利亚地质调查局（Geoscience Australia，GA）的地球物理学家开展质量检查，确保GA发布的最终数据符合使用要求。本数据集的像元尺寸为0.0005度（约合49米）。本网格数据由维多利亚州政府于2000年采集获取，总测线长度达12489测线公里，测线间距为200米，飞行离地高度为80米。该网格采用红、绿、蓝三色分别对应钾、钍、铀的地面浓度进行配色，配色范围被限定在99%的线性拉伸区间内。上述配色在阴影化的总计数图层上设置为透明叠加。该范围限定操作会在放射元素浓度极低的区域，在比值网格中引入一定伪影。将该3波段图像叠加至同次测量的阴影化总计数网格图层上，即可得到最终成果图像。