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<title>MDG77TOGMT</title>
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<h1 align="center">MDG77TOGMT</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#OPTIONS">OPTIONS</a><br>
<a href="#EXAMPLES">EXAMPLES</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<a href="#REFERENCES">REFERENCES</a><br>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">mgd77togmt
− Convert an MGD-77 ASCII file to a binary gmt
file</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>mgd77togmt</b>
[ <b>−L</b><i>list</i> ] [ <i>mgd77file</i> ]
<b>−F</b><i>legid</i> <b>−Y</b><i>start_year</i>
[ <b>−A</b><i>information</i> ] [
<b>−I</b><i>time_increment</i> ]
[<b>−T</b>[<i>offset</i>]]
[<b>−W</b>[<i>cable_length</i>]] [ <b>−V</b>
]</p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>mgd77togmt</b>
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, <b>mgd77togmt</b> will
convert those to corrected depths using the Carter tables.
Both old and new (Y2K-compliant) MGD-77 files are
supported.</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−L</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Name of file with several records of the format
<i>mgd77file legid start_year</i>. For multiple files, use
this option rather than the <b>−F −Y</b>
combination.</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−Y</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>The year of the first data point in the file. If not
provided and -L option not used, it tries to get it from a
header file. The header file must be in the same directory
of the main file and must have a name equal to the main but
with a .h77 extension.</p></td></tr>
</table>
<h2>OPTIONS
<a name="OPTIONS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">No space
between the option flag and the associated arguments.</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em"><b>−A</b></p></td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em">Set an optional 10 character
information string to be stored in the header [Default is
blank].</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−F</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Leg id that will be used in file name
(<i>legid</i>.gmt). If not given, it will be constructed
from the mgd77file name plus the .gmt extension.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−I</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Used for files where time is missing. The increment is
used to calculate fake times.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−T</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Extracts Total field instead of anomaly. Since F does
not hold in a 2 byte signed variable we subtract a constant
[default = 40000] but you can provide another value in
<i>offset</i>.</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−W</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Take into account that the magnetometer is not at
ship’s position. <i>cable_length</i> is magnetometer
tow distance [default = 200 meters]. If <b>−W</b> only
is given (e.g., no <i>cable_length</i>) and like with the
<b>−Y</b> option, we try to get the tow distance from
the header file. Failing, defaults to 200 meters. Note that
this option will throw away the first points whose
accumulated. distance since the start of magnetic
acquisition is less than <i>cable_length</i>, and likewise
for the end of the mag profile.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−V</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Selects verbose mode, which will send progress reports
to stderr [Default runs "silently"].</p></td></tr>
</table>
<h2>EXAMPLES
<a name="EXAMPLES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">To create a gmt
file from the ASCII file c2104.mgd77, run</p>
<p style="margin-left:11%; margin-top: 1em"><b>mgd77togmt</b>
c2104.mgd77 <b>−Y</b> 1977</p>
<p style="margin-left:11%; margin-top: 1em">To create new
gmt files from all the mgd77 files listed in
<i>list.d</i>:</p>
<p style="margin-left:11%; margin-top: 1em"><b>mgd77togmt
−L</b> list.d <b>−V</b></p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b><i><A HREF="dat2gmt.html">dat2gmt</A></i></b>(1),
<i><A HREF="GMT.html">GMT</A></i>(1)</p>
<h2>REFERENCES
<a name="REFERENCES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">Wessel, P., and
W. H. F. Smith, 2014, The Generic Mapping Tools (GMT)
version 4.5.12 Technical Reference & Cookbook,
SOEST/NOAA. <br>
Wessel, P., and W. H. F. Smith, 1998, New, Improved Version
of Generic Mapping Tools Released, EOS Trans., AGU, 79 (47),
p. 579. <br>
Wessel, P., and W. H. F. Smith, 1995, New Version of the
Generic Mapping Tools Released, EOS Trans., AGU, 76 (33), p.
329. <br>
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. <br>
Wessel, P., and W. H. F. Smith, 1991, Free Software Helps
Map and Display Data, EOS Trans., AGU, 72 (41), p. 441.</p>
<p style="margin-left:11%; margin-top: 1em">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.</p>
<p style="margin-left:11%; margin-top: 1em">Carter, D. J.
T., <i>Echo Sounding Correction Tables: Formerly
Matthews’ Tables</i>, 150 pp, Hydrographic Department,
Ministry of Defense, Taunton, Somerset, England, 1980.</p>
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