atures, then the argument to <code>zones</code> should
be a <code>list</code> of <code>matrix</code> or <code>Matrix</code> objects that shows the
specific scheme for each feature using the conventions described above.
The default argument to <code>zones</code> is an identity
matrix (i.e., a matrix with ones along the matrix diagonal and zeros
elsewhere), so that planning units are only considered connected if they
are both allocated to the same zone.</p></dd>


<dt id="arg-data">data<a class="anchor" aria-