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<title>File Aggregation</title>
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<H1>Aggregating Data Files</H1>
<p>Autoplot allows data from multiple files to be combined into one dataset
through an aggregation specification. Data must be time-ordered,
and each file must have time as the first data dimension.
</p>
<p>For example,
<code>vap:http://cdaweb.gsfc.nasa.gov/istp_public/data/ace/swe/$Y/ac_k0_swe_$Y$m$d_v...cdf?Np&timerange=2009+Apr"</code>
loads each if the files covering the interval April 2009 and combines them.
</p>
<p>The text field in this GUI is for specifying the time range. Most
human-readable formats should be parsed correctly, but here are some
examples:
<ul>
<li>2009-Apr: The month of April 2009.
<li>2009-4-11: April 11, 2009.
<li>2009: The entire year of 2009.
<li>2009-095: three-digit day of year (April 5, 2009)
<li>2009-4-5 to 2009-4-11: the time range covering the interval. Note 2009-4-11
is excluded from the interval, "through" includes it.
</ul>
</p>
<p>This component will attempt to show what data is available for
the given specification. The droplist components can be used to select
a year, month or date, and then "Copy" will copy the selection to the
Time Range text field. Note the keywords "to" and "through" allow for
arbitrary ranges.
</p>
<p>Here field codes:</p>
<ul>
<li>$Y four-digit year
<li>$y two-digit year
<li>$j three-digit day of year
<li>$m two-digit month
<li>$d two-digit day of month
<li>$H two-digit hour
<li>$M two-digit minute
<li>$S two-digit second
<li>$v version number, numerical sort $(v,alpha) $(v,sep) for "x.y.z"
<li>$(milli) three digit milliseconds
<li>$(micro) three digit microseconds
</ul>
<a href="http://autoplot.org/help#aggregator_main">this page in the wiki</a>
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