digits").</p></td>
    </tr>
    </table>
    
    <h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>

    <p>data.frame containing the aggregated od flows.</p>
    
    <h2 class="hasAnchor" id="details"><a class="anchor" href="#details"></a>Details</h2>

    
    <p>Origin-destination ('OD') flow data is often provided
in the form of 1 line per flow with zone codes of origin and destination
centroids. This function aggregates OD flows between polygon geometries
allocating the 