Expand Grid

Use the Grid and Image > Utilities > Expand Grid menu option (geogxnet.dll(Geosoft.GX.GridUtils.GridExpand;Run)*) to expand a grid by adding dummies to the new expanded region beyond the edges of the old grid. This is designed mainly to provide a bordering area to be filled by GRIDFILL in preparation for MAGMAP.

Expand Grid dialog options

Input grid file	Input Grid file name.(.grd file) Script Parameter: GRIDXPND.GRDIN
Expanded output grid	Output Expanded Grid file name.(.grd file) Script Parameter: GRIDXPND.GRDOUT
Minimum % to expand the grid	Minimum percentage to expand the grid.(Default = 10.0) Script Parameter: GRIDXPND.MINPER
Shape of the output grid	Shape of the output grid.(Can be 'SQUARE' or 'RECTANGLE'. default is 'SQUARE') Script Parameter: GRIDXPND.SHAPE
Expand X dimension to	Dimension in X direction which the input grid is expanded to. Script Parameter: GRIDXPND.XDIM
Expand Y dimension to	Dimension in Y direction which the input grid is expanded to. Script Parameter: GRIDXPND.YDIM

Application Notes

*The GX.NET tools are embedded in the geogxnet.dll file located in the \Geosoft\Desktop Applications\bin folder. To run this GX interactively (outside the menu), first navigate to the bin directory and provide the GX.NET tool in the specified format. See the Run GX topic for more guidance.

GRIDXPND.XDIM and GRIDXPND.YDIM will default to input grid dimension values if they are not specified, or if they are set to 0.

The default dimensions are chosen to be compatible with the Wynograd FFT used by MAGMAP.