C# 北东地和东北天坐标系转换

一、将正负180的值转成0-360

     /// <summary>
        /// 正负180， 0--->360
        /// </summary>
        /// <param name="p"></param>
        /// <returns></returns>
        public static double Conv_k(double p)
        {
            while (p > 180) 
            {
                p = p - 360;
            }
            while (p < -180)
            {
                p = p + 360;
            }

            if(p<=90)
            {
                return 90 - p;
            }
            if(p>90)
            {
                return 360 + (90 - p);
            }
            return 0;
        }        

 2、将北东地 0--->360，转换为东北天0--->正负180

        /// <summary>
        /// 将北东地 0--->360，转换为东北天0--->正负180
        /// </summary>
        /// <param name="p"></param>
        /// <returns></returns>
        public static double Conv_k_rev(double p)
        {
            //转换至0-360°
            while (p > 360)
            {
                p = p - 360;
            }
            while (p < 0)
            {
                p = p + 360;
            }
            //转换至±180°
            if (p <= 270)
            {
                return 90 - p;
            }
            if (p > 270)
            {
                return 360 + (90 - p);
            }
            return 0;
        }