p>The point to compare this point with</p>
                                </div>
                              </td>
                            </tr>
                          </tbody>
                        </table>
                      </div>
                      <div>
                        <h4>Return Value</h4>
                        <p><code>unknown</code> if the altitude is the same (very, very unlikely), <code>down</code> if the provided point is below this point and <code>up</code> if the pro