grdcut(1) Extract a subregion out of a .grd file


grdcut input_file.grd -Goutput_file.grd -Rwest/east/south/north[r] [ -V ]


grdcut will produce a new output_file.grd file which is a subregion of input_file.grd. The subregion is specified with -Rwest/east/south/north as in other programs; the specified range must not exceed the range of input_file.grd. If in doubt, run grdinfo to check range. Complementary to grdcut there is grdpaste, which will join together two grdfiles along a common edge.
this is the input .grd format file.
this is the output .grd format file.
west, east, south, and north specify the Region of interest. To specify boundaries in degrees and minutes [and seconds], use the dd:mm[:ss] format. Append r if lower left and upper right map coordinates are given instead of wesn. This defines the subregion to be cut out.


Selects verbose mode, which will send progress reports to stderr [Default runs "silently"].


Suppose you have used surface to grid ship gravity in the region between 148E - 162E and 8N - 32N, and you do not trust the gridding near the edges, so you want to keep only the area between 150E - 160E and 10N - 30N, then:

grdcut grav_148_162_8_32.grd -Ggrav_150_160_10_30.grd -R150/160/10/30 -V