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       grdcut - 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.

       -R     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.


       -V     Selects verbose mode, which will send progress  reports  to  stderr  [Default  runs


       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


       grdpaste(1gmt), grdinfo(1gmt), gmt(1gmt)

                                            1 Jan 2004                                  GRDCUT(l)