NAME

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

SYNOPSIS

       mgd77togmt  [  -Llist ] [ mgd77file ] -Flegid -Ystart_year [ -Ainforma-
       tion ] [ -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-compliant)  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, run

       mgd77togmt c2104.mgd77 -Y1977 -Fc2104

       To create new gmt files from all the mgd77 files listed in list.d:

       mgd77togmt -Llist.d -V

SEE ALSO

       dat2gmt(GMTMANSECTION), gmt(GMTMANSECTION)

REFERENCES

       Wessel, P., and W. H. F. Smith, 2004, The Generic Mapping  Tools  (GMT)
       version 4 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  Map-
       ping Tools Released, EOS Trans., AGU, 76 (33), p. 329.
       Wessel,  P.,  and W. H. F. Smith, 1995, New Version of the Generic Map-



GMT4.0                            1 Oct 2004         MDG77TOGMT(GMTMANSECTION)