NAME

     grdclip - Clipping of range in grdfiles.

SYNOPSIS

     grdclip input_file.grd -Goutput_file.grd [ -Ahigh/above ]  [
     -Blow/below ] [ -V ]

DESCRIPTION

     grdclip will set values < low to below and/or values >  high
     to  above.   Useful  when  you want all of a continent or an
     ocean to fall into one color or grayshade in image  process-
     ing,  or  clipping  of the range of data values is required.
     above/below can be any number or NaN (Not  a  Number).   You
     must choose at least one of -A or -B.

     input_file.grd
          The input 2-D binary grdfile.

     -G    output_file.grd is the modified output grdfile.

OPTIONS

     -A    Set all data[i] > high to above.

     -B    Set all data[i] < low to below.

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

EXAMPLES

     To set all values > 70 to NaN and all values <  0  to  0  in
     file data.grd, try:

     grdclip data.grd -Gnew_data.grd -A70/NaN -B0/0 -V

SEE ALSO

     gmt, grdlandmask, grdmask, grdmath, grd2xyz, xyz2grd

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.