Geosoft Grid .GRD and .GGF File Description

Surfer can import and export Geosoft .GRD grid version 2 format in compressed and uncompressed format and export .GGF format. Sometimes there is an associated .GI projection file that comes with the binary .GRD file.

File Description

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.

Loading .GRD Files

Geosoft .GRD files can be loaded to create a grid based map (i.e. Home | New Map | Contour) with the Open Grid dialog, or when using the functions in the Grid menu.

Import Options Dialog

No import options dialog is displayed.

Import Automation Options

No import options are available.

Saving Files

Use the Grids | Edit | Convert command in the plot document, or File | Save As in the Grid Editor to export .GRD or .GGF files. Alternatively, the Geosoft .GRD or .GGF file format is available when prompted to save a grid file.

Export Options Dialog

When the input grid is georeferenced, see Spatial References

Export Automation Options

No export options are available.

See Also

File Format Chart

Export Options - Spatial References