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<title>X_INIT</title>
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<h1 align="center">X_INIT</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#BEWARE">BEWARE</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"><b>x_init</b>
− Initialization of Cross-Over Data Bases.</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>x_init
−I</b></p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">The purpose of
<b>x_init</b> is to create two key files that will be
holding all the cross-over information for all the cruises
tested. These files are called <i>xx_base.b</i> and
<i>xx_legs.b</i>, and they will contain data for each
cross-over and totals for each leg, respectively.
<b>x_init</b> will create these two files in the current
directory, and write out the fileheader with a 1 as the next
record number in the case of xx_base.b. NB! Any previous
files with the same names in the current directory will be
erased, so use with caution.</p>
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<p><b>−I</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Must be present form initialization to take effect.</p></td></tr>
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<h2>BEWARE
<a name="BEWARE"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">Both files are
binary and have fixed record lengths. The formats of the
files are as follows: <b><br>
xx_base.b:</b></p>
<p style="margin-left:22%;">Record length = 40 bytes. <br>
Rec # 1: fileheader <br>
Rec # 2: pairheader <br>
Next n recs: crossover-structure <br>
Rec # n+3: pairheader etc. <br>
The fileheader is a 40 byte character string where the last
10 bytes contains the record number of the last record in
the file. The pairheader is a 40 byte character string which
contains the names of the two legs in question and the
number of COEs generated between them. The
crossover-structure contains all the information for one
COE, that is lat, lon, time along leg values of gravity,
magnetics, and bathymetry at the cross-over point, the
heading of track #1, and the heading of track #2. See
program listing for more details on formats. The file is
sequential in that new data are appended at the end of the
file.</p>
<p style="margin-left:11%;"><b>xx_legs.b:</b></p>
<p style="margin-left:22%;">Record length = 204 bytes.</p>
<p style="margin-left:22%; margin-top: 1em">Each record
contains the complete information for each leg that has been
checked. The leg-structure contains fields like year of
cruise, number of internal/external COEs for gravity,
magnetics, and bathymetry, their means and standard
deviations, and the best fitting regression lines, i.e., the
dc-shifts and drift-rates computed from the time/error data
points. See program listing for complete description of
record format.</p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><i><A HREF="GMT.html">GMT</A></i>(1),
<i><A HREF="x_system.html">x_system</A></i>(1)</p>
<h2>REFERENCES
<a name="REFERENCES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">Wessel, P.
XOVER: A Cross-over Error Detector for Track Data,
<i>Computers & Geosciences, 15</i>, 333-346.</p>
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