public function getArea(): float {
        $event = new MeasurementOpEvent($this);
        $this->fireOperationEvent(MeasurementOpEvent::AREA_EVENT, $event);
        return $event->getResults();
    }
public function getArea(): float {
        $event = new MeasurementOpEvent($this);
        $this->fireOperationEvent(MeasurementOpEvent::AREA_EVENT, $event);
        return $event->getResults();
    }
public function getArea ( ) : float { $ event = new MeasurementOpEvent ( $ this ) ; $ this -> fireOperationEvent ( MeasurementOpEvent :: AREA_EVENT , $ event ) ; return $ event -> getResults ( ) ; }
Gets the area of this MultiSurface, as measured in the spatial reference
system of this Surface.

@return float
Gets the area of this MultiSurface as measured in the spatial reference system of this Surface .