[C#]火星坐标系 (GCJ-02)与百度坐标系 (BD-09) 转换帮助类

关键代码:

using System;

using YanZhiwei.DotNet2.Utilities.Models;

namespace YanZhiwei.DotNet2.Utilities.Common

{

    /// <summary>

    /// 火星坐标系 (GCJ-02)与百度坐标系 (BD-09) 转换帮助类

    /// </summary>

    public class BDGCJLatLonHelper

    {

        /*

         *参考：

         *BD09坐标系：即百度坐标系，GCJ02坐标系经加密后的坐标系。

         */

        #region 常量

        const double x_pi = 3.14159265358979324 * 3000.0 / 180.0;

        #endregion 

        #region 将GCJ-02坐标转换成BD-09坐标

        /// <summary>

        /// 将GCJ-02坐标转换成BD-09坐标

        /// </summary>

        /// <param name="gcjPoint">GCJ-02坐标</param>

        /// <returns>BD-09坐标</returns>

        public LatLngPoint GCJ02ToBD09(LatLngPoint gcjPoint)

        {

            LatLngPoint _bdPoint = new LatLngPoint();

            double _x = gcjPoint.LonX, y = gcjPoint.LatY;

            double _z = Math.Sqrt(_x * _x + y * y) + 0.00002 * Math.Sin(y * x_pi);

            double _theta = Math.Atan2(y, _x) + 0.000003 * Math.Cos(_x * x_pi);

            _bdPoint.LonX = _z * Math.Cos(_theta) + 0.0065;

            _bdPoint.LatY = _z * Math.Cos(_theta) + 0.006;

            return _bdPoint;

        }

        #endregion 

        #region 将BD-09坐标转换成GCJ-02坐标

        /// <summary>

        /// 将BD-09坐标转换成GCJ-02坐标

        /// </summary>

        /// <param name="bdPoint">BD-09坐标</param>

        /// <returns>GCJ-02坐标</returns>

        public LatLngPoint BD09ToGCJ02(LatLngPoint bdPoint)

        {

            LatLngPoint _gcjPoint = new LatLngPoint();

            double _x = bdPoint.LonX - 0.0065, _y = bdPoint.LatY - 0.006;

            double _z = Math.Sqrt(_x * _x + _y * _y) - 0.00002 * Math.Sin(_y * x_pi);

            double _theta = Math.Atan2(_y, _x) - 0.000003 * Math.Cos(_x * x_pi);

            _gcjPoint.LonX = _z * Math.Cos(_theta);

            _gcjPoint.LatY = _z * Math.Sin(_theta);

            return _gcjPoint;

        }

        #endregion 

    }

}