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grdpaste - Paste together two .grd files along a common edge.
grdpaste file_a.grd file_b.grd -Goutfile.grd [ -V ]
grdpaste will combine file_a.grd and file_b.grd into outfile.grd by pasting them together along their common edge. Files file_a.grd and file_b.grd must have the same dx, dy and have one edge in common. If in doubt, check with grdinfo and use grdcut and/or grdsample if necessary to prepare the edge joint. file_a.grd One of two files to be pasted together. file_b.grd The other of two files to be pasted together. -Goutfile.grd The name for the combined output.
-V Selects verbose mode, which will send progress reports to stderr [Default runs "silently"].
Suppose file_a.grd is 150E - 180E and 0 - 30N, and file_b.grd is 150E - 180E, -30S - 0, then you can make outfile.grd which will be 150 - 180 and -30S - 30N by: grdpaste file_a.grd file_b.grd -Goutfile.grd -V