NAME

      mgd77togmt - Convert an MGD-77 ascii file to a binary gmt file


SYNOPSIS

      mgd77togmt [ -Llist ] [ mgd77file ] -Flegid -Ystart_year [
      -Ainformation ] [ -Itime_increment ] [ -V ]


DESCRIPTION

      mgd77togmt reads an ASCII MGD-77 format file [or standard input] and
      creates a binary gmt file.  The 16 header records specified in the
      MGD-77 documentation may or may not be present.  If two-way travel
      times are available, mgd77togmt will convert those to corrected depths
      using the Carter tables.  Both old and new (Y2K-compiant) MGD-77 files
      are supported.

      -L   Name of file with several records of the format mgd77file legid
           start_year.  For multiple files, use this option rather than the
           -F -Y combination.  -F Leg id that will be used in file name
           (legid.gmt).

      -Y   The year of the first data point in the file


OPTIONS

      No space between the option flag and the associated arguments.

      -A   Set an optional 10 character information string to be stored in
           the header  [Default is blank].

      -I   Used for files where time is missing.  The increment is used to
           calculate fake times.

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


EXAMPLES

      To create a gmt file from the ASCII file c2104.mgd77, try

      mgd77togmt c2104.mgd77 -Y1977 -Fc2104

      To create new gmt files from all the mgd77-file listed in list.d, try

      mgd77togmt -Llist.d -V


SEE ALSO

      dat2gmt, gmt


REFERENCES

      Wessel, P., and W. H. F. Smith, 1999, The Generic Mapping Tools (GMT)
      version 3.2 Technical Reference & Cookbook, SOEST/NOAA.
      Wessel, P., and W. H. F. Smith, 1998, New, Improved Version of Generic
      Mapping Tools Released, EOS Trans., AGU, 79 (47), p. 579.
      Wessel, P., and W. H. F. Smith, 1995, New Version of the Generic
      Mapping Tools Released, EOS Trans., AGU, 76 (33), 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 (41), p. 441.

      MGD77 Task Group, 1977, The Marine Geophysical Data Exchange Format -
      'MGD77', Key to Geophysical Records documentation No. 10, National
      Geophysical and Solar-Terrestrial Data Center, Boulder, CO.

      Carter, D. J. T., Echo Sounding Correction Tables: Formerly Matthews'
      Tables, 150 pp, Hydrographic Department, Ministry of Defense, Taunton,
      Somerset, England, 1980.





































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