mgd77togmt

       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 argu­
       ments.

       -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,
       sion  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: 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 doc­
       umentation  No. 10, National Geophysical and Solar-Terres­
       trial Data Center, Boulder, CO.

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