Data files in formats specific to Geosoft software Zipped components are available in the zip directory. High-resolution imagery is available in the map_images directory. gdb: Geosoft database format Alaska EastCentUS EasternUS WestCentUS WesternUS grd: Geosoft grid format NAMrad_K.grd NAMrad_K.grd.gi NAMrad_Th.grd NAMrad_Th.grd.gi NAMrad_U.grd NAMrad_U.grd.gi NAMrad_exp.grd NAMrad_exp.grd.gi map: Geosoft map format CosmicDose NAM_CCM NAM_K NAM_Th NAM_U NAM_exp