/**
* 坐标系转换工具类
*/
public class PositionUtil { public static double pi = 3.1415926535897932384626;
public static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;
public static double a = 6378245.0;
public static double ee = 0.00669342162296594323; public 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;
} public 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 static double[] transform(double lat, double lon) {
if (outOfChina(lat, lon)) {
return new double[]{lat, lon};
}
double dLat = transformLat(lon - 105.0, lat - 35.0);
double dLon = transformLon(lon - 105.0, lat - 35.0);
double radLat = lat / 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);
double mgLat = lat + dLat;
double mgLon = lon + dLon;
return new double[]{mgLat, mgLon};
} public 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;
} /**
* WGS-84 转 火星坐标系
*
* @param lat
* @param lon
* @return
*/
public static double[] gps84_To_Gcj02(double lat, double lon) {
if (outOfChina(lat, lon)) {
return new double[]{lat, lon};
}
double dLat = transformLat(lon - 105.0, lat - 35.0);
double dLon = transformLon(lon - 105.0, lat - 35.0);
double radLat = lat / 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);
double mgLat = lat + dLat;
double mgLon = lon + dLon;
return new double[]{mgLat, mgLon};
} /**
* 火星坐标系 (GCJ-02) 转 WGS-84
*
* @param lat
* @param lon
* @return
*/
public static double[] gcj02_To_Gps84(double lat, double lon) {
double[] gps = transform(lat, lon);
double lontitude = lon * 2 - gps[1];
double latitude = lat * 2 - gps[0];
return new double[]{latitude, lontitude};
} /**
* 火星坐标系 (GCJ-02) 转百度坐标系 (BD-09)
*
* @param lat
* @param lon
* @return
*/
public static double[] gcj02_To_Bd09(double lat, double lon) {
double x = lon, y = 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 tempLon = z * Math.cos(theta) + 0.0065;
double tempLat = z * Math.sin(theta) + 0.006;
double[] gps = {tempLat, tempLon};
return gps;
} /**
* 百度坐标系 (BD-09) 转 火星坐标系 (GCJ-02)
*
* @param lat
* @param lon
* @return
*/
public static double[] bd09_To_Gcj02(double lat, double lon) {
double x = lon - 0.0065, y = 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);
double tempLon = z * Math.cos(theta);
double tempLat = z * Math.sin(theta);
double[] gps = {tempLat, tempLon};
return gps;
} /**
* 将gps84转为bd09
*
* @param lat
* @param lon
* @return
*/
public static double[] gps84_To_bd09(double lat, double lon) {
double[] gcj02 = gps84_To_Gcj02(lat, lon);
double[] bd09 = gcj02_To_Bd09(gcj02[0], gcj02[1]);
return bd09;
} /**
* bd09 转 84
*
* @param lat
* @param lon
* @return
*/
public static double[] bd09_To_gps84(double lat, double lon) {
double[] gcj02 = bd09_To_Gcj02(lat, lon);
double[] gps84 = gcj02_To_Gps84(gcj02[0], gcj02[1]);
//保留小数点后六位
gps84[0] = retain6(gps84[0]);
gps84[1] = retain6(gps84[1]);
return gps84;
} /**
* 保留小数点后六位
*
* @param num
* @return
*/
private static double retain6(double num) {
String result = String.format("%.6f", num);
return Double.valueOf(result);
} /**
* 经纬度转化为坐标，单位是公里
* 米勒圆柱投影 介绍 ：http://resources.arcgis.com/zh-cn/help/main/10.1/index.html#//003r00000039000000
*
* @param lon
* @param lat
* @return
*/
public static double[] millerXY(double lon, double lat) {
//地球周长
double L = 6381372 * Math.PI * 2;
// 平面展开后，x轴等于周长
double W = L;
// y轴约等于周长一半
double H = L / 2;
// 米勒投影中的一个常数，范围大约在正负2.3之间
double mill = 2.3;
// 将经度从度数转换为弧度
double x = lon * Math.PI / 180;
// 将纬度从度数转换为弧度
double y = lat * Math.PI / 180;
// 米勒投影的转换
y = 1.25 * Math.log(Math.tan(0.25 * Math.PI + 0.4 * y));
// 弧度转为实际距离
x = (W / 2) + (W / (2 * Math.PI)) * x;
y = (H / 2) - (H / (2 * mill)) * y;
double[] result = new double[2];
result[0] = x;
result[1] = y;
return result; } }