r of line segments to use to approximate a quarter
circle. Parameter passed to buffer functions, default is 5 for sp and
30 for sf.</p></td>
    </tr>
    </table>

    <h2 class="hasAnchor" id="details"><a class="anchor" href="#details"></a>Details</h2>

    

<p>Calculates the catchment area of a facility (e.g., cycle path) using
straight-line distance as well as summary statistics from variables
available in a SpatialPolygonsDataFrame with census tracts or other
zones. Assumes that the frequency of the v