 which the
catchment area is being calculated. If the object contains more than one
facility (e.g., multiple cycle paths) the aggregate catchment area will be
calculated.</p></td>
    </tr>
    <tr>
      <th>calccols</th>
      <td><p>A vector of column names containing the variables in the
polygonlayer to be used in the calculation of the summary statistics for
the catchment area. If dissolve = FALSE, all other variables in the
original SpatialPolygonsDataFrame for zones that fall partly or entirely
withi