ate system.
        </p>
<p>
          The box is not one of the basic types in Boost.Geometry (point, linestring,
          polygon) but it is a <span class="emphasis"><em>helper type</em></span>. The main reasons
          for the box existance are its usefulness for indexing (a spatial index,
          or splitting a geometry into monotonic sections) and it is the output of
          the <a class="link" href="../algorithms/envelope.html" title="envelope">envelope</a>
          algorithm.
        </p>
<p>