GSV Pitfield Plains Vic pot tho ura totg 4band radiometric grid geodetic

This GSV Pitfield Plains 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 Pitfield Plains, Vic, 1987 (GSV1759). 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 Pitfield Plains 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 1987 by the VIC Government, and consisted of 1295 line-kilometres of data at 250m 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.

本数据集为编号GSV1759的维多利亚州皮特菲尔德平原（Pitfield Plains, Vic）四波段放射能网格大地测量数据（其中pot代指钾（Potassium）、tho代指钍（Thorium）、ura代指铀（Uranium）、totg代指总计数（Total Count）），数据源自1987年该区域航空探测获取的钾、钍、铀放射能数据，以及日照阴影总计数放射能数据。
放射能测量法（radiometric method），又称伽马射线能谱测量法（gamma-ray spectrometric method），可探测地表附近因钾（K）、铀（U）和钍（Th）自然放射性衰变产生的伽马射线的自然变化。所采集的数据将通过标准流程处理，以确保记录的响应仅源于地下岩石的放射性衰变。经处理得到的数据集可通过解译揭示地下地质构造。经处理的数据将由澳大利亚地球科学局（GA）的地球物理学家开展质量检查，以确保GA发布的最终数据符合使用要求。
本GSV皮特菲尔德平原四波段放射能网格大地测量数据的网格单元尺寸为0.0005度（约49米）。本网格的数据由维多利亚州政府于1987年采集，共包含1295线公里的探测数据，测线间距为250米，飞行离地高度为80米。该网格采用红色对应钾地面浓度、绿色对应钍地面浓度、蓝色对应铀地面浓度的配色方案。配色范围被裁剪至99%线性比例尺区间，且该配色在日照阴影总计数图层上设置为透明效果。这种裁剪操作会在放射性元素浓度极低的区域，于比值网格中引入一定的人工伪影。将该三波段影像叠加至同次测量的日照阴影总计数网格图层，即可得到最终成果影像。