/**
* 坐标转换工具类
* WGS84坐标系：即地球坐标系，国际上通用的坐标系。Earth (GPS坐标系)
* GCJ02坐标系：即火星坐标系，WGS84坐标系经加密后的坐标系。Mars (谷歌地图(中国)、高德地图、腾讯地图)
* BD09坐标系：即百度坐标系，GCJ02坐标系经加密后的坐标系。 Bd09 (百度地图)
* 搜狗坐标系、图吧坐标系等，估计也是在GCJ02基础上加密而成的。 （该类地图使用较少）
*/
public class CoordinateConvert {
/**
* 元周率
*/
private static final double PI = Math.PI;
/**
* 卫星椭球坐标投影到平面地图坐标系的投影因子
*/
private static final double AXIS = 6378245.0;
/**
* 椭球的偏心率 (a^2 - b^2) / a^2
*/
private static final double OFFSET = 0.00669342162296594323;
private static final double X_PI = PI * 3000.0 / 180.0;
/**
* 地球半径,单位 km
*/
private static final double EARTH_RADIUS = 6378137.0;
/**
* GCJ-02=>BD09 火星坐标系=>百度坐标系
*/
public static double[] gcj2BD09(double glat, double glon) {
double x = glon;
double y = glat;
double[] latlon = new double[2];
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);
latlon[0] = z * Math.sin(theta) + 0.006;
latlon[1] = z * Math.cos(theta) + 0.0065;
return latlon;
}
/**
* BD09=>GCJ-02 百度坐标系=>火星坐标系
*/
public static double[] bd092GCJ(double glat, double glon) {
double x = glon - 0.0065;
double y = glat - 0.006;
double[] latlon = new double[2];
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);
latlon[0] = z * Math.sin(theta);
latlon[1] = z * Math.cos(theta);
return latlon;
}
/**
* BD09=>WGS84 百度坐标系=>地球坐标系
*/
public static double[] bd092WGS(double glat, double glon) {
double[] latlon = bd092GCJ(glat, glon);
return gcj2WGSExactly(latlon[0], latlon[1]);
}
/**
* WGS84=>BD09 地球坐标系=>百度坐标系
*/
public static double[] wgs2BD09(double wgLat, double wgLng) {
double[] latlon = wgs2GCJ(wgLat, wgLng);
return gcj2BD09(latlon[0], latlon[1]);
}
/**
* WGS84=>GCJ02 地球坐标系=>火星坐标系
*/
public static double[] wgs2GCJ(double wgLat, double wgLng) {
double[] latlon = new double[2];
if (outOfChina(wgLat, wgLng)) {
latlon[0] = wgLat;
latlon[1] = wgLng;
return latlon;
}
double[] deltaD = delta(wgLat, wgLng);
latlon[0] = wgLat + deltaD[0];
latlon[1] = wgLng + deltaD[1];
return latlon;
}
/**
* GCJ02=>WGS84 火星坐标系=>地球坐标系(粗略)
*/
public static double[] gcj2WGS(double glat, double glon) {
double[] latlon = new double[2];
if (outOfChina(glat, glon)) {
latlon[0] = glat;
latlon[1] = glon;
return latlon;
}
double[] deltaD = delta(glat, glon);
latlon[0] = glat - deltaD[0];
latlon[1] = glon - deltaD[1];
return latlon;
}
/**
* GCJ02=>WGS84 火星坐标系=>地球坐标系（精确）
*/
public static double[] gcj2WGSExactly(double gcjLat, double gcjLng) {
double initDelta = 0.01;
double threshold = 0.000000001;
double dLat = initDelta, dLng = initDelta;
double mLat = gcjLat - dLat, mLng = gcjLng - dLng;
double pLat = gcjLat + dLat, pLng = gcjLng + dLng;
double wgsLat, wgsLng, i = 0;
while (true) {
wgsLat = (mLat + pLat) / 2;
wgsLng = (mLng + pLng) / 2;
double[] tmp = wgs2GCJ(wgsLat, wgsLng);
dLat = tmp[0] - gcjLat;
dLng = tmp[1] - gcjLng;
if ((Math.abs(dLat) < threshold) && (Math.abs(dLng) < threshold)) {
break;
}
if (dLat > 0) {
pLat = wgsLat;
} else {
mLat = wgsLat;
}
if (dLng > 0) {
pLng = wgsLng;
} else {
mLng = wgsLng;
}
if (++i > 10000) {
break;
}
}
double[] latlon = new double[2];
latlon[0] = wgsLat;
latlon[1] = wgsLng;
return latlon;
}
/**
* 根据经纬度，计算两点间的距离
*
* @param longitude1 第一个点的经度
* @param latitude1 第一个点的纬度
* @param longitude2 第二个点的经度
* @param latitude2 第二个点的纬度
* @return 返回距离 单位米
*/
public static double getDistance(double longitude1, double latitude1, double longitude2, double latitude2) {
// 纬度
double lat1 = Math.toRadians(latitude1);
double lat2 = Math.toRadians(latitude2);
// 经度
double lng1 = Math.toRadians(longitude1);
double lng2 = Math.toRadians(longitude2);
// 纬度之差
double a = lat1 - lat2;
// 经度之差
double b = lng1 - lng2;
// 计算两点距离的公式
double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) +
Math.cos(lat1) * Math.cos(lat2) * Math.pow(Math.sin(b / 2), 2)));
// 弧长乘地球半径, 返回单位: 米
s = s * EARTH_RADIUS;
return s;
}
private static double[] delta(double wgLat, double wgLng) {
double[] latlng = new double[2];
double dLat = transformLat(wgLng - 105.0, wgLat - 35.0);
double dLng = transformLng(wgLng - 105.0, wgLat - 35.0);
double radLat = wgLat / 180.0 * PI;
double magic = Math.sin(radLat);
magic = 1 - OFFSET * magic * magic;
double sqrtMagic = Math.sqrt(magic);
dLat = (dLat * 180.0) / ((AXIS * (1 - OFFSET)) / (magic * sqrtMagic) * PI);
dLng = (dLng * 180.0) / (AXIS / sqrtMagic * Math.cos(radLat) * PI);
latlng[0] = dLat;
latlng[1] = dLng;
return latlng;
}
private static boolean 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;
}
private 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;
}
private static double transformLng(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;
}
/**
* 精确计算两个除数的结果
* @param d1 除数
* @param d2 被除数
* @param digit 精度
* @return: double
*/
public static double calDvi(double d1, double d2, int digit) {
if (d2 == 0) {
return 0;
}
BigDecimal bi1 = BigDecimal.valueOf(d1);
BigDecimal bi2 = BigDecimal.valueOf(d2);
return bi1.divide(bi2, digit, RoundingMode.HALF_UP).doubleValue();
}
}
来源：CSDN
作者：AWen_Jack
链接：https://blog.csdn.net/AWen_Jack/article/details/104042701