ngth = item.length;
                    }
                    for (j = 0; j < item.length; j += 2) {
                        // var coord = trans.untransform(new maptalks.Point(Number(item[j]), Number(item[j + 1])),1);
                        //coordinates.push([coord.x,coord.y]);
                        var x = Number(item[j]) / 20037508.34 * 180;
                        var y = Number(item[j + 1]) / 20037508.34 * 180;
                        y = 180 / Math.PI * (2 * Math.atan(Math.exp(y * Math.PI / 180)) 