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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>
<a name="NAME"></a>
<h2>NAME</h2>
<p style="margin-left:11%; margin-top: 1em"><b>x_init</b>
− Initialization of Cross-Over Data Bases.</p>
<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
<p style="margin-left:11%; margin-top: 1em"><b>x_init
−I</b></p>
<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</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>
<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" valign="top"><b>−I</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Must be present
form initialization to take effect.</p></td>
<td width="0%">
</td>
</table>
<a name="BEWARE"></a>
<h2>BEWARE</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>
<table width="100%" border=0 rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
<td width="8%"></td>
<td width="8%">
<p valign="top">Record length = 40 bytes.</p></td>
<td width="7%"></td>
<td width="8%"></td>
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</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%">
</td>
<td width="8%"></td>
<td width="8%">
<p valign="top">Rec # 1:</p></td>
<td width="7%"></td>
<td width="8%">
</td>
<td width="54%">
<p valign="top">fileheader</p></td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%">
</td>
<td width="8%"></td>
<td width="8%">
<p valign="top">Rec # 2:</p></td>
<td width="7%"></td>
<td width="8%">
</td>
<td width="54%">
<p valign="top">pairheader</p></td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%">
</td>
<td width="8%"></td>
<td width="8%">
<p valign="top">Next n recs:</p></td>
<td width="7%"></td>
<td width="8%"></td>
<td width="54%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
<td width="8%"></td>
<td width="8%"></td>
<td width="7%"></td>
<td width="8%"></td>
<td width="54%">
<p valign="top">crossover-structure</p></td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%">
</td>
<td width="8%"></td>
<td width="8%">
<p valign="top">Rec # n+3:</p></td>
<td width="7%"></td>
<td width="8%"></td>
<td width="54%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
<td width="8%"></td>
<td width="8%"></td>
<td width="7%"></td>
<td width="8%"></td>
<td width="54%">
<p valign="top">pairheader etc.</p></td>
</table>
<p style="margin-left:22%;">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>
<table width="100%" border=0 rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
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<p valign="top">Record length = 204 bytes.</p></td>
</table>
<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>
<a name="SEE ALSO"></a>
<h2>SEE ALSO</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>
<a name="REFERENCES"></a>
<h2>REFERENCES</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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