The Geosoft Grid filter imports Geosoft .GRD or .GGF grid version 2 format in compressed and uncompressed format and exports in .GRD or .GGF format.
Geosoft grid is a binary format for storing raster data typically used for geophysical and elevation data. Two files describe each grid (.GRD and .GI). Technical information on this file format is reportedly available in the manual for Geosoft’s Montaj software application.
Sometimes there is an associated .GI projection file that comes with the binary .GRD file.
File Name Extensions
.GI, .GRD, .GGF
The .GI file contains information about the coordinate reference system.
Choose the File | Import command.
Select a lattice or image module and choose the File | Save Data command to export .GRD or .GGF files.
File Format Chart
File | Import
File | Save Data