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<title>X_UPDATE</title>
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<h1 align=center>X_UPDATE</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_update</b>
− Archiving of Cross-Over Information</p>
<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
<p style="margin-left:11%; margin-top: 1em"><b>x_update</b>
<i>cross-overfile</i> [ <b>−X</b><i>xbase</i> ] [
<b>−L</b><i>legbase</i> ] [ <b>−V</b> ] [
<b>−W</b><i>max</i> ]</p>
<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
<p style="margin-left:11%; margin-top: 1em"><b>x_update</b>
reads the ASCII file produced by <b><A HREF="x_over.html">x_over</A></b> and writes
the information to the database files <i>xx_base.b</i> and
<i>xx_legs.b</i> (unless other filenames are specified on
the command line) using a compact, binary format. The
options recognized are:</p>
<table width="100%" border=0 rules="none" frame="void"
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<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−X</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Indicate alternate
<i>xx_base.b</i> file.</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−L</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Indicate alternate
<i>xx_legs.b</i> file.</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−V</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Selects verbose
mode, which will send progress reports to stderr [Default
runs "silently"]. Reports the pair currently being
processed.</p> </td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−W</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Prints a warning if
the number of COEs generated by any pair of legs exceed
<i>max</i>.</p> </td>
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<a name="BEWARE"></a>
<h2>BEWARE</h2>
<p style="margin-left:11%; margin-top: 1em">For security
reasons the <i>xx_legs.b</i> are first renamed to
<i>xx_legs.b_old</i>, to prevent loss of information if a
black-out or system crash should occur during writing of the
new <i>xx_legs.b</i> file. It is recommended that the old
file is left on the disk in case of other disasters. Note
that <b>x_update</b> does not check if a pair of legs
already exist in the <i>xx_base.b</i> file. It is the
user’s responsibility to ensure that duplication of
information does not occur. Should some pairs already in the
database need to be re-examined, then run <b><A HREF="x_remove.html">x_remove</A></b>
which will wipe out all traces of the specified cruises from
the x_system data base files. Now we can pass the pairs that
need to be redone through <b>x_over/x_update</b> again.</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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