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 "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


      grdpaste, grdinfo, gmt

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