b'Geophysics in the surveysNewsGeological Survey of South Australia: Full sets of merged GCAS grids nowavailableFigure 1.The GCAS community information package contains an interactive map illustrating the survey area.In 2017 the Government of South Australia, in partnership with Geoscience Australia began the worlds largest airborne geophysical and terrain imaging program, the Gawler Craton Airborne Survey (GCAS)\x08 GCAS captured approximately 1 660 000 line kilometres of new magnetic, radiometric and digital elevation data over an area of 295 000 km2\x08The GCAS was divided into 16 regions (Figure 1) and a series of products for each region have been released\x08 These include new magnetic, radiometric and elevation data and images, as well as value-added magnetic data products and models of depth to prospective rocks\x08The latest products to be released are a series of magnetic, radiometric, laser and radar elevation datasets\x08 These have been meticulously merged to provide seamless, internally consistent sets of gridded data across the entire GCASFigure 2.The merged TMI grid shown above has a variable reduction to pole (VRTP) filter applied and is area\x08 one of 22 TMI and enhanced TMI grids available in the TMI download package.APRIL 2021 PREVIEW 18'