docs: function(projection) {
          var area = 0.0;
          if(this.components && (this.components.length > 0)) {
              area += Math.abs(this.components[0].getGeodesicArea(projection));
              for(var i=1, len=this.components.length; i<len; i++) {
                  area -= Math.abs(this.components[i].getGeodesicArea(projection));
              }
          }
          return area;
      }