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<title>X2SYS_GET</title>
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<h1 align="center">X2SYS_GET</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="#NOTE">NOTE</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">x2sys_get
− Get track listing from the x2sys track index
databases</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>x2sys_get
−T</b><i>TAG</i> [ <b>−C</b> ] [ <b>−D</b>
] [ <b>−E</b> ] [ <b>−F</b><i>flags</i> ] [
<b>−L</b>[<i>list</i>] ] [ <b>−N</b><i>flags</i>
] [ <b>−Qe</b>|<b>i</b> ] [
<b>−R</b><i>west</i>/<i>east</i>/<i>south</i>/<i>north</i>[<b>r</b>]
] [ <b>−V</b> ] ]</p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>x2sys_get</b>
will return the names of the track data files in the x2sys
data base for this TAG that match the given requirements.
You may choose a specific region and optionally ask only for
tracks that meet certain data criteria. Finally, you may
select an option to list all possible pairs that might
generate crossovers.</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>−T</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Specify the x2sys <i>TAG</i> which tracks the attributes
of this data type.</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>−C</b></p></td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em">Instead of reporting the track
names, just output the coordinates of the center of each bin
that has at least one track with the specified data.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−D</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Only report the track names [Default adds the
availability of data for each field].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−E</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Append the file extension to all reported tracks [no
extension].</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>Give a comma-separated list of column names (as
described in the definition file) that should all be present
within the selected region. [Default selects all data
columns]. A track will be included in the returned list if
at least one bin reports that the track has all of the
listed columns.</p></td></tr>
<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>Crossover mode. Return a list of track pairs that should
be checked for possible crossovers. The list is determined
from the bin-index data base on the assumption that tracks
occupying the same bin are very likely to intersect. By
default we return all possible pairs in the data base.
Append the name of a file with a list of tracks if you want
to limit the output to those pairs that involve at least one
of the track names in your list. The output is suitable for
the <b>−K</b> option in <b><A HREF="x2sys_cross.html">x2sys_cross</A></b>.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−N</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Give a comma-separated list of column names (as
described in the definition file) that all must be absent. A
track will be excluded from the returned list if at least
one bin reports that the track some all of the listed
columns.</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−Q</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Append <b>e</b> for external COEs only, and <b>i</b> for
internal COEs only [Default is all COEs]. This applies to
the crossover setup only and requires <b>−L</b>.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−R</b></p></td>
<td width="8%"></td>
<td width="78%">
<p><i>west, east, south,</i> and <i>north</i> specify the
Region of interest, and you may specify them in decimal
degrees or in [+-]dd:mm[:ss.xxx][W|E|S|N] format. Append
<b>r</b> if lower left and upper right map coordinates are
given instead of w/e/s/n. The two shorthands
<b>−Rg</b> and <b>−Rd</b> stand for global
domain (0/360 and -180/+180 in longitude respectively, with
-90/+90 in latitude). Alternatively, specify the name of an
existing grid file and the <b>−R</b> settings (and
grid spacing, if applicable) are copied from the grid. For
Cartesian data just give <i>xmin/xmax/ymin/ymax</i>. This
option limits the tracks to those that fall at least partly
inside the specified domain.</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 find all the
tracks associated with the tag MGD77, restricted to occupy a
certain region in the south Pacific, and have at least free
air anomalies and bathymetry, try</p>
<p style="margin-left:11%; margin-top: 1em"><b>x2sys_get
−V −T</b> MGD77 <b>−R</b> 180/240/-60/-30
<b>−F</b> faa,depth</p>
<p style="margin-left:11%; margin-top: 1em">To find all the
tracks associated with the tag MGD77 that have depth but not
twt, try</p>
<p style="margin-left:11%; margin-top: 1em"><b>x2sys_get
−V −T</b> MGD77 <b>−F</b> depth
<b>−N</b> twt</p>
<p style="margin-left:11%; margin-top: 1em">To find all the
pairs associated with the tag MGD77 that might intersect
each other, but only those pairs which involves tracks in
your list new.lis, try</p>
<p style="margin-left:11%; margin-top: 1em"><b>x2sys_get
−V −T</b> MGD77 <b>−L</b> new.lis >
xpairs.lis</p>
<h2>NOTE
<a name="NOTE"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">The tracks that
are returned all have the requested data (<b>−F</b>)
within the specified region (<b>−R</b>). Furthermore,
the columns of Y and N for other data types also reflect the
content of the track portion within the selected region.</p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><i><A HREF="x2sys_binlist.html">x2sys_binlist</A></i>(1),
<i><A HREF="x2sys_cross.html">x2sys_cross</A></i>(1), <i><A HREF="x2sys_datalist.html">x2sys_datalist</A></i>(1),
<i><A HREF="x2sys_init.html">x2sys_init</A></i>(1), <i><A HREF="x2sys_list.html">x2sys_list</A></i>(1),
<i><A HREF="x2sys_put.html">x2sys_put</A></i>(1), <i><A HREF="x2sys_report.html">x2sys_report</A></i>(1),
<i><A HREF="x2sys_solve.html">x2sys_solve</A></i>(1)</p>
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