State radiometric concentration grids were created by merging the data recorded across many airborne radiometric surveys. This was an update to previous State grids to include recent surveys such as the extensive Gawler Craton Airborne Survey. Data was levelled using a combination of the AWAGS2 (Australia Wide Airborne Geophysical Survey) and vehicle-borne streaming radiometric tie-lines. Additional levelling procedures were employed using software routines developed by Geoscience Australia. Grids were low-pass filtered using a 7-point, degree-3 Savitzky-Golay filter (Savitzky, A. and Golay, Analytical Chemistry, 36: 1627-1639). In some regions grid resolution was improved using an upward continuation of one cell size. Concentration grids Potassium (K), Thorium (Th), Uranium (U) and Total Count (TC) grids were created using Intrepid grid merge with open file surveys. The previous state grid (2016) was used as the base map and merged with new or reprocessed grids. - SA_RAD_K_2024 - Potassium (%K), 57 new or reprocessed grids - SA_RAD_Th_2024 - Thorium (equivalent (e) ppm eTh), 118 new or reprocessed grids - SA_RAD_U_2024 - Uranium (equivalent (e) ppm eU), 162 new or reprocessed grids - SA_RAD_TC_2024 – Total Count (cps), 139 new or reprocessed grids Ternary Grid (SA_RAD_KThU_RGB_2024) A ternary (3 band) ERMapper raster consisting of the concentration grids: - Red – Potassium (SA_RAD_K_2024) - Green – Thorium (SA_RAD_Th_2024) - Blue –Uranium (SA_RAD_U_2024) U2 / Th (SA_RAD_U2Th_2024) A single band ERMapper grid of uranium squared divided by thorium. Most values are between 0 – 20 but outliers are extreme so best viewed with quantiles colour stretch rather than intervals. Log Normalised Scaled (SA_RAD_LNS_RGB_2024) A technique published by Mark Grujic1 for increasing contrast in areas dominated by extreme low or high values for one element. The grid has been named LNS to reflect the general process and was produced using WinDisp™. Log Normalised Scaled (LNS) 1. Log transform K,Th and U grids 2. Normalise log grids to between 0 and 1 3. Divide normalised values by sum of the three normalised values. An ESRI .lyr file has been created for each GDA94 & GDA2020 raster which includes an overlay of Total Count as a sunshade layer. 1: https://www.linkedin.com/pulse/visualising-regional-radiometics-data-mark-grujic/ Please note that the Hillshade does not always automatically load into ArcMap and ArcGIS Pro projects. If this happens, please load the SA_RAD_TC_2024_GDA2020_DD.ers (or SA_RAD_TC_2024_GDA94_DD.ers) into your project first, then reload the other layer.