// Chiriin Map Standard 2013 (Overlay)
	function GSIStd2013OverlayedMapType() {

		GSIStd2013OverlayedMapType.prototype.tileSize = new google.maps.Size(256,256);
		GSIStd2013OverlayedMapType.prototype.minZoom = 15;
		GSIStd2013OverlayedMapType.prototype.maxZoom = 17;
		GSIStd2013OverlayedMapType.prototype.name = 'GSI Std 2013 (Overlay)';
		GSIStd2013OverlayedMapType.prototype.alt = 'Chiriin Map Standard 2013 (Overlay)';

		GSIStd2013OverlayedMapType.prototype.getTile = function( tileXY, zoom, ownerDocument ) {
			var tileImage = ownerDocument.createElement('img');

			var url= "http://cyberjapandata.gsi.go.jp/xyz/std/" 
						+ zoom.toString() + "/" + tileXY.x.toString() + "/" 
						+ tileXY.y.toString() + ".png";

			tileImage.src = url;
			tileImage.style.width  = this.tileSize.width  + 'px';
			tileImage.style.height = this.tileSize.height + 'px';
			
			tileImage.style.opacity = 0.4; // <=== Set Opacity

			return tileImage;
		};
	}