 visits UID.</p></td>
    </tr>
    <tr>
      <th>spdf</th>
      <td><p>spatial object of dat.</p></td>
    </tr>
    <tr>
      <th>minPts</th>
      <td><p>minimum number of points, default to 3.</p></td>
    </tr>
    </table>

    <h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>

    <p>a <code>data.frame</code> with summarized data per visit:</p><ul>
<li><p>&#8220;effortDiam&#8221;: the 2 times the maximum of the distances between
  the centroid of all observation point