stating from which surface the smallest
overlapping polygon is kept. By default set to 0 square kilometer
(meaning that by default the smallest islands will be conserved).</p></dd>


<dt id="arg-area-th-mainland">area_th_mainland<a class="anchor" aria-label="anchor" href="#arg-area-th-mainland"></a></dt>
<dd><p>When two polygons overlap, the smallest or the
biggest one can be kept. When the surface of the smallest polygon exceeds
this number, the smallest polygon is kept. Otherwise, we keep the bigg