NAME

     grdcut - Extract a subregion out of a .grd file


SYNOPSIS

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


DESCRIPTION

     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.

     input_file.grd
          this is the input .grd format file.

     -Goutput_file.grd
          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.


OPTIONS

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


EXAMPLES

     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


SEE ALSO

     grdpaste(l), grdinfo(l), gmt(l)