op">=</span> <span class="cn">NULL</span>,</span>
<span>  keep <span class="op">=</span> <span class="cn">FALSE</span>,</span>
<span>  list_columns <span class="op">=</span> <span class="cn">NULL</span></span>
<span><span class="op">)</span></span></code></pre></div>
    </div>

    <div id="arguments">
    <h2>Arguments</h2>
    <dl><dt>obj</dt>
<dd><p>sorted matrix or data.frame</p></dd>


<dt>x</dt>
<dd><p>x geometry column</p></dd>


<dt>y</dt>
<dd><p>y geometry column</p></dd>


<dt>z</dt>
<dd><p>z geo