GPS转换为百度经纬度

package com.cttsp.utils;


public class GpsGoBaiDuUtil {
// WGS-84 坐标系 转 GCJ-02
private final static double pi = 3.14159265358979324;
private final static double a = 6378245.0;
private final static double ee = 0.00669342162296594323;
// GCJ-02坐标系 转 BD-09
private static final double x_pi = 3.14159265358979324 * 3000.0 / 180.0;


/**
* @param lat:纬度
*            lon:经度 gps纬度转百度地图
* @return 0:纬度 1:经度
*/
public static Double[] getBaiDu(double lat, double lon) {
double latlng[] = new double[2];
Double[] result = new Double[2];
if (lat > 0 && lon> 0) {// 有经纬度上报
double[] transform = transform(lat, lon, latlng);
if (transform != null) {
result[0] = bd_encrypt(transform[0], transform[1])[0];
result[1] = bd_encrypt(transform[0], transform[1])[1];
return result;
}
}
result[0] = 0.0;
result[1] = 0.0;
return result;
}


private static double[] transform(double wgLat, double wgLon, double[] latlng) {
// if (outOfChina(wgLat, wgLon)) {
// latlng[0] = wgLat;
// latlng[1] = wgLon;
// return null;
// }
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);
latlng[0] = wgLat + dLat;
latlng[1] = wgLon + dLon;
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 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;
}


private static double[] 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);
double bd_lon = z * Math.cos(theta) + 0.0065;
double bd_lat = z * Math.sin(theta) + 0.006;
double[] tmp = new double[2];
tmp[0] = bd_lat;
tmp[1] = bd_lon;
return tmp;
}
}

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