1MDG77TOGMT(1)                Generic Mapping Tools               MDG77TOGMT(1)
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NAME

6       mgd77togmt - Convert an MGD-77 ASCII file to a binary gmt file
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SYNOPSIS

9       mgd77togmt  [  -Llist ] [ mgd77file ] -Flegid -Ystart_year [ -Ainforma‐
10       tion ] [ -Itime_increment ] [ -V ]
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DESCRIPTION

13       mgd77togmt reads an ASCII MGD-77 format file [or  standard  input]  and
14       creates  a  binary  gmt  file.   The 16 header records specified in the
15       MGD-77 documentation may or may not  be  present.   If  two-way  travel
16       times  are available, mgd77togmt will convert those to corrected depths
17       using the Carter tables.  Both old and new (Y2K-compliant) MGD-77 files
18       are supported.
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20       -L     Name  of file with several records of the format mgd77file legid
21              start_year.  For multiple files, use this option rather than the
22              -F -Y combination.
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24       -F     Leg id that will be used in file name (legid.gmt).
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26       -Y     The year of the first data point in the file.
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OPTIONS

29       No space between the option flag and the associated arguments.
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31       -A     Set  an optional 10 character information string to be stored in
32              the header  [Default is blank].
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34       -I     Used for files where time is missing.  The increment is used  to
35              calculate fake times.
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37       -V     Selects verbose mode, which will send progress reports to stderr
38              [Default runs "silently"].
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EXAMPLES

41       To create a gmt file from the ASCII file c2104.mgd77, run
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43       mgd77togmt c2104.mgd77 -Y1977 -Fc2104
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45       To create new gmt files from all the mgd77 files listed in list.d:
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47       mgd77togmt -Llist.d -V
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SEE ALSO

50       dat2gmt(1), GMT(1)
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REFERENCES

53       Wessel, P., and W. H. F. Smith, 2005, The Generic Mapping  Tools  (GMT)
54       version 4.1 Technical Reference & Cookbook, SOEST/NOAA.
55       Wessel,  P., and W. H. F. Smith, 1998, New, Improved Version of Generic
56       Mapping Tools Released, EOS Trans., AGU, 79 (47), p. 579.
57       Wessel, P., and W. H. F. Smith, 1995, New Version of the  Generic  Map‐
58       ping Tools Released, EOS Trans., AGU, 76 (33), p. 329.
59       Wessel,  P.,  and W. H. F. Smith, 1995, New Version of the Generic Map‐
60       ping Tools Released, http://www.agu.org/eos_elec/95154e.html, Copyright
61       1995 by the American Geophysical Union.
62       Wessel,  P., and W. H. F. Smith, 1991, Free Software Helps Map and Dis‐
63       play Data, EOS Trans., AGU, 72 (41), p. 441.
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65       MGD77 Task Group, 1977, The Marine Geophysical Data Exchange  Format  -
66       MGD77,  Key  to Geophysical Records documentation No. 10, National Geo‐
67       physical and Solar-Terrestrial Data Center, Boulder, CO.
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69       Carter, D. J. T., Echo Sounding Correction Tables:  Formerly  Matthews'
70       Tables,  150 pp, Hydrographic Department, Ministry of Defense, Taunton,
71       Somerset, England, 1980.
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75GMT 4.3.1                         15 May 2008                    MDG77TOGMT(1)
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