/// <summary>
        /// 内容是否相等
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public override bool Equals(object obj)
        {
            CoordinateReferenceSystem other = obj as CoordinateReferenceSystem;

            if (other == null)
            {
                return(false);
            }

            bool val = CoordinateSystem.Equals(other.CoordinateSystem) &&
                       Datum.Equals(other.Datum);

            return(val);
        }