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, grdinfo, gmt

REFERENCES

     Wessel, P., and W. H. F. Smith, 1995,  The  Generic  Mapping
     Tools  (GMT)  version  3.0  Technical  Reference & Cookbook,
     SOEST/NOAA.
     Wessel, P., and W. H. F. Smith, 1995,  New  Version  of  the
     Generic Mapping Tools Released, EOS Trans. AGU, 76, p. 329.
     Wessel, P., and W. H. F. Smith, 1995,  New  Version  of  the
     Generic           Mapping           Tools          Released,
     http://www.agu.org/eos_elec/95154e.html, Copyright  1995  by
     the American Geophysical Union.
     Wessel, P., and W. H. F. Smith, 1991,  Free  Software  Helps
     Map and Display Data, EOS Trans. AGU, 72, p. 441.