private void computeLonglat() {
		List<PictureObject> pictures = new LinkedList<PictureObject>();
		pictures = this.getPictures(pictures);
		double averageLongitude = 0.0;
		double averageLatitude = 0.0;
		for (PictureObject picture : pictures) {
			LocationObject loc = picture.getLocation();
			averageLongitude += loc.getLongitude();
			averageLatitude += loc.getLatitude();
		}
		averageLongitude = averageLongitude / pictures.size();
		averageLatitude = averageLatitude / pictures.size();
		this.longlat = new Point.Double(averageLongitude, averageLatitude);
	}