GSV Murray Basin Numurkah Vic pot tho ura totg 4band radiometric grid geodetic

This GSV Murray Basin Numurkah 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 Bendigo East (Burrumbeet, Numurkah), Vic, 1980 (GSV0188). 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 Murray Basin Numurkah Vic pot tho ura totg 4band radiometric grid geodetic has a cell size of 0.0005 degrees (approximately 50m). The data used to produce this grid was acquired in 1980 by the VIC Government, and consisted of 16417 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1980年维多利亚州（VIC）本迪戈东区（伯拉米比特、努默卡）区域的航空衍生钾（Potassium）、钍（Thorium）、铀（Uranium）放射测量数据集，配套带阴影渲染的总计数放射测量数据，编号GSV0188。
放射测量法即伽马射线能谱法（gamma-ray spectrometric method），可探测地表附近的伽马射线自然变化，该变化源于钾（Potassium）、铀（Uranium）、钍（Thorium）的天然放射性衰变。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。经处理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（GA）的地球物理学家开展质量核查，确保GA发布的最终数据符合使用要求。
本GSV穆雷盆地努默卡维多利亚州四波段（钾、钍、铀、总计数）放射测量大地网格的像元大小为0.0005度（约50米）。
用于生成该网格的数据由维多利亚州（VIC）政府于1980年采集，总测线长度达16417线公里，测线间距为250米，飞行离地高度为80米。
该网格通过色彩映射生成：将钾（Potassium）的地面浓度映射为红色，钍（Thorium）的地面浓度映射为绿色，铀（Uranium）的地面浓度映射为蓝色。色彩范围被裁剪至99%线性刻度，且该彩色图层在阴影渲染的总计数（Total Count）图层上呈透明状态。
该裁剪操作必然会在放射性元素浓度极低的区域，给比值网格引入部分伪影。本次最终成果图像由三波段影像叠加在同次测量的阴影渲染总计数（Total Count，简称TC）网格上生成。