/// <summary>
        /// Returns a <see cref="AngularUnit"/> given a piece of WKT.
        /// </summary>
        /// <param name="tokenizer">WktStreamTokenizer that has the WKT.</param>
        /// <returns>An object that implements the IUnit interface.</returns>
        private static IAngularUnit ReadAngularUnit(WktStreamTokenizer tokenizer)
        {
            tokenizer.ReadToken("[");
            string unitName = tokenizer.ReadDoubleQuotedWord();

            tokenizer.ReadToken(",");
            tokenizer.NextToken();
            double unitsPerUnit  = tokenizer.GetNumericValue();
            string authority     = String.Empty;
            long   authorityCode = -1;

            tokenizer.NextToken();
            if (tokenizer.GetStringValue() == ",")
            {
                tokenizer.ReadAuthority(ref authority, ref authorityCode);
                tokenizer.ReadToken("]");
            }
            return(new AngularUnit(unitsPerUnit, unitName, authority, authorityCode, String.Empty, String.Empty, String.Empty));
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="tokenizer"></param>
        /// <returns></returns>
        private static IPrimeMeridian ReadPrimeMeridian(WktStreamTokenizer tokenizer)
        {
            //PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]]
            tokenizer.ReadToken("[");
            string name = tokenizer.ReadDoubleQuotedWord();

            tokenizer.ReadToken(",");
            tokenizer.NextToken();
            double longitude = tokenizer.GetNumericValue();

            tokenizer.NextToken();
            string authority     = String.Empty;
            long   authorityCode = -1;

            if (tokenizer.GetStringValue() == ",")
            {
                tokenizer.ReadAuthority(ref authority, ref authorityCode);
                tokenizer.ReadToken("]");
            }
            // make an assumption about the Angular units - degrees.
            IPrimeMeridian primeMeridian = new PrimeMeridian(longitude, AngularUnit.Degrees, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);

            return(primeMeridian);
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="tokenizer"></param>
        /// <returns></returns>
        private static IProjectedCoordinateSystem ReadProjectedCoordinateSystem(WktStreamTokenizer tokenizer)
        {
            /*PROJCS[
             *      "OSGB 1936 / British National Grid",
             *      GEOGCS[
             *              "OSGB 1936",
             *              DATUM[...]
             *              PRIMEM[...]
             *              AXIS["Geodetic latitude","NORTH"]
             *              AXIS["Geodetic longitude","EAST"]
             *              AUTHORITY["EPSG","4277"]
             *      ],
             *      PROJECTION["Transverse Mercator"],
             *      PARAMETER["latitude_of_natural_origin",49],
             *      PARAMETER["longitude_of_natural_origin",-2],
             *      PARAMETER["scale_factor_at_natural_origin",0.999601272],
             *      PARAMETER["false_easting",400000],
             *      PARAMETER["false_northing",-100000],
             *      AXIS["Easting","EAST"],
             *      AXIS["Northing","NORTH"],
             *      AUTHORITY["EPSG","27700"]
             * ]
             */
            tokenizer.ReadToken("[");
            string name = tokenizer.ReadDoubleQuotedWord();

            tokenizer.ReadToken(",");
            tokenizer.ReadToken("GEOGCS");
            IGeographicCoordinateSystem geographicCS = ReadGeographicCoordinateSystem(tokenizer);

            tokenizer.ReadToken(",");
            IProjection projection = ReadProjection(tokenizer);
            IUnit       unit       = ReadLinearUnit(tokenizer);

            string authority     = String.Empty;
            long   authorityCode = -1;

            tokenizer.NextToken();
            List <AxisInfo> axes = new List <AxisInfo>(2);

            if (tokenizer.GetStringValue() == ",")
            {
                tokenizer.NextToken();
                while (tokenizer.GetStringValue() == "AXIS")
                {
                    axes.Add(ReadAxis(tokenizer));
                    tokenizer.NextToken();
                }
                if (tokenizer.GetStringValue() == "AUTHORITY")
                {
                    tokenizer.ReadAuthority(ref authority, ref authorityCode);
                    tokenizer.ReadToken("]");
                }
            }
            //This is default axis values if not specified.
            if (axes.Count == 0)
            {
                axes.Add(new AxisInfo("X", AxisOrientationEnum.East));
                axes.Add(new AxisInfo("Y", AxisOrientationEnum.North));
            }
            IProjectedCoordinateSystem projectedCS = new ProjectedCoordinateSystem(geographicCS.HorizontalDatum, geographicCS, unit as LinearUnit, projection, axes, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);

            return(projectedCS);
        }