s._image.src;
        //console.log(src);
        var xhr = new XMLHttpRequest();
        xhr.open('GET', url, true);
        xhr.responseType = 'arraybuffer';
        xhr.onload = function(e) {
            tt = this.response;
//            var tiff = GeoTIFF.parse(this.response);
            var img  = UPNG.decode(tt);
            var rgba = UPNG.toRGBA8(img)[0];
            var h = img.height;
            var w = img.width;
            var ctype = img.ctype;
            var depth = img.depth;
            