d="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
    <p>an edge list <code>data.frame</code> object, with the following columns:</p><ul><li><p><code>feature</code>: feature name.</p></li>
<li><p><code>from.X</code>: longitude of the origin (source).</p></li>
<li><p><code>from.Y</code>: latitude of the origin (source).</p></li>
<li><p><code>to.X</code>: longitude of the destination (target).</p></li>
<li><p><code>to.Y</code>: latitude of the destination (target).</p></li>
<li><p><