/// <summary>
        /// Delaunay三角网整体边长平均值(全局)
        /// </summary>
        /// <param name="tin"></param>
        /// <returns></returns>
        private double GlobalMean(ITin tin)
        {
            double       length      = 0;
            ITinAdvanced tinAdvanced = tin as ITinAdvanced;
            int          edgeCount   = tinAdvanced.EdgeCount;

            for (int i = 1; i <= edgeCount; i++)
            {
                if (tinAdvanced.GetEdge(i).IsInsideDataArea)
                {
                    length = length + tinAdvanced.GetEdge(i).Length;
                }
            }
            return(length / (double)tinAdvanced.DataEdgeCount);
        }
        /// <summary>
        /// 整体边长标准差(全局)
        /// </summary>
        /// <param name="tin"></param>
        /// <param name="globalMean"></param>
        /// <returns></returns>
        private double GlobalStDev(ITin tin, double globalMean)
        {
            double       a           = 0;
            ITinAdvanced tinAdvanced = tin as ITinAdvanced;
            int          edgeCount   = tinAdvanced.EdgeCount;

            //            int edgeCount = tinAdvanced.DataEdgeCount;
            for (int i = 1; i <= edgeCount; i++)
            {
                if (tinAdvanced.GetEdge(i).IsInsideDataArea)
                {
                    ITinEdge tinEdge = tinAdvanced.GetEdge(i);
                    a = a + (globalMean - tinEdge.Length) * (globalMean - tinEdge.Length);
                }
            }
            return(System.Math.Sqrt(a / (double)tinAdvanced.DataEdgeCount));
        }