关于GPS定位经纬度到谷歌(google)坐标以及百度(百度)坐标的转换c#源码

2020年08月10日

阅读数：31

这篇文章主要向大家介绍关于GPS定位经纬度到谷歌(google)坐标以及百度(百度)坐标的转换c#源码,主要内容包括基础应用、实用技巧、原理机制等方面，希望对大家有所帮助。

using System;

namespace WindowsFormsApplication3

{

class EvilTransform

{

const double pi = 3.14159265358979324;

const double x_pi = 3.14159265358979324 * 3000.0 / 180.0;

public struct BDcoor

{

public double bd_lon { get; set; }

public double bd_lat { get; set; }

}

public struct HDCoor

{

public double gg_lon { get; set; }

public double gg_lat { get; set; }

}

//

// Krasovsky 1940

//

// a = 6378245.0, 1/f = 298.3

// b = a * (1 - f)

// ee = (a^2 - b^2) / a^2;

const double a = 6378245.0;

const double ee = 0.00669342162296594323;

//

// World Geodetic System ==> Mars Geodetic System

public void transform(double wgLat, double wgLon, out double mgLat, out double mgLon)

{

if (outOfChina(wgLat, wgLon))

{

mgLat = wgLat;

mgLon = wgLon;

return;

}

double dLat = transformLat(wgLon - 105.0, wgLat - 35.0);

double dLon = transformLon(wgLon - 105.0, wgLat - 35.0);

double radLat = wgLat / 180.0 * pi;

double magic = Math.Sin(radLat);

magic = 1 - ee * magic * magic;

double sqrtMagic = Math.Sqrt(magic);

dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);

dLon = (dLon * 180.0) / (a / sqrtMagic * Math.Cos(radLat) * pi);

mgLat = wgLat + dLat;

mgLon = wgLon + dLon;

}

static bool outOfChina(double lat, double lon)

{

if (lon < 72.004 || lon > 137.8347)

return true;

if (lat < 0.8293 || lat > 55.8271)

return true;

return false;

}

static double transformLat(double x, double y)

{

double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.Sqrt(Math.Abs(x));

ret += (20.0 * Math.Sin(6.0 * x * pi) + 20.0 * Math.Sin(2.0 * x * pi)) * 2.0 / 3.0;

ret += (20.0 * Math.Sin(y * pi) + 40.0 * Math.Sin(y / 3.0 * pi)) * 2.0 / 3.0;

ret += (160.0 * Math.Sin(y / 12.0 * pi) + 320 * Math.Sin(y * pi / 30.0)) * 2.0 / 3.0;

return ret;

}

static double transformLon(double x, double y)

{

double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.Sqrt(Math.Abs(x));

ret += (20.0 * Math.Sin(6.0 * x * pi) + 20.0 * Math.Sin(2.0 * x * pi)) * 2.0 / 3.0;

ret += (20.0 * Math.Sin(x * pi) + 40.0 * Math.Sin(x / 3.0 * pi)) * 2.0 / 3.0;

ret += (150.0 * Math.Sin(x / 12.0 * pi) + 300.0 * Math.Sin(x / 30.0 * pi)) * 2.0 / 3.0;

return ret;

}

///

///

///

///

///

///

public BDcoor bd_encrypt(double gg_lat, double gg_lon)

{

double x = gg_lon, y = gg_lat;

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);

BDcoor bd = new BDcoor();

bd.bd_lon = z * Math.Cos(theta) + 0.0065;

bd.bd_lat = z * Math.Sin(theta) + 0.006;

return bd;

}

///

///

///

///

///

///

public HDCoor bd_decrypt(double bd_lat, double bd_lon)

{

double x = bd_lon - 0.0065, y = bd_lat - 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);

HDCoor hd = new HDCoor();

hd.gg_lon = z * Math.Cos(theta);

hd.gg_lat = z * Math.Sin(theta);

return hd;

}

}

}