ometries having
            a surface, namely box, polygon, ring, multipolygon. The units are the
            square of the units used for the points defining the surface. If subject
            geometry is defined in meters, then area is calculated in square meters.
          </p>
<p>
            The area calculation can be done in all three common coordinate systems,
            Cartesian, Spherical and Geographic as well.
          </p>
<h6>
<a name="geometry.reference.algorithms.area.area_1.h1"></a>
   