metry column</p></dd>


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


<dt>linestring_id</dt>
<dd><p>column of ids for linestrings</p></dd>


<dt>keep</dt>
<dd><p>logical indicating if the non-geometry and non-id columns should be kept.
if TRUE you must supply the geometry and id columns, and only the first row of
each geometry is kept. See Keeping Properties.</p></dd>


<dt>list_columns</dt>
<dd><p>vector of column names to turn into a list.</p></dd>

</dl></div>
    <div id="value">
    <h2>Value</h2>
   