TileCook.GridSetFactory.SHPERICAL_MERCATOR C# (CSharp) Method

        private static IGridSet SHPERICAL_MERCATOR()
        {
            List<double> resolutions = new List<double>() {
                156543.03390625,
                78271.516953125,
                39135.7584765625,
                19567.87923828123,
                9783.93961914062,
                4891.96980957031,
                2445.98490478516,
                1222.99245239258,
                611.496226196289,
                305.7481130981445,
                152.874056549072,
                76.4370282745361,
                38.2185141372681,
                19.109257068634,
                9.55462853431702,
                4.77731426715851,
                2.38865713357925,
                1.19432856678963,
                0.597164283394814,
                0.298582141697407
            };

            return new GridSet(
                "SphericalMercator",
                "EPSG:900913",
                new Envelope(-20037508.34, -20037508.34, 20037508.34, 20037508.34),
                resolutions,
                256,
                256,
                .00028,
                false
            );
        }