Merge Grids

Merge Grids merges all grids in the input directory by patching them onto the merged grid in a reverse priority order (i.e. the worst grids are placed at the bottom, the best on top). This is a simple and fast solution used for quality control. There is no limit on the size of the grids that can be merged using this tool.

Quick Link: See Using GridMerge With Large Grids for an explanation of memory management in GridMerge.

The aliases and parameters that must be set for this process (via the Set Aliases and Parameters menu) are shown in the table below.

Control File Keyword	Type	Description
inputGridDirectoryMerge	string	The input grid directory. This is a sub-directory of the Working Directory.
outputGridDirectoryMerge	string	The output grid directory.
outputGridMerge	string	The output grid name.
priorityOrderFileMerge	string	The grid Priority Order File.
cellSizeMerge	float	The desired cell size (degrees or metres, depending on the projection of the input grids).
topLeftXMerge*	float	The top-left X coordinate of the output grid (this is also the X origin).
topLeftYMerge*	float	The top-left Y coordinate of the output grid (this is also the Y origin).
bottomRightXMerge*	float	The bottom-right X coordinate of the output grid.
bottomRightYMerge*	float	The bottom-right Y coordinate of the output grid.

* optional. If left unspecified, GridMerge will calculate the grid extents from the input grids.