/*** 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();}}