 latitude is approximately 100 km, so the
default value of 6 for <code>ll_digits</code> is equivalent to about 10 cm.</p></dd>

</dl></div>
    <div id="value">
    <h2>Value</h2>
    <p>A <code>data.frame</code> filtered to only retain observations from sites with
the allowed number of observations within the period of closure. The
results will be sorted such that sites are together and in chronological
order. The following variables are added to the data frame:</p><ul><li><p><code>site</code>: a unique id