package com.dayu.pipirrapp.utils;
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/**
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* author: zuo
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* Date: 2023/12/20
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* Time: 11:01
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* wgs84 84年提出，大地坐标，也是原始坐标。
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* gcj02 02年提出，火星坐标，经过加密算法。大多数非百度中国地图厂商基本都是使用的火星坐标：高德，腾讯，谷歌中国cn
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* bd09 09年提出，百度坐标，经过火星坐标再次加密，相当于对大地坐标经过了二次加密。百度自己使用
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* 一般的算法，没有直接bd09->wgs84或者wgs84->bd09，都需要借助wgs84->gcj02或者gcj02->wgs84算法推导。
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* <p>
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* 备注：坐标系转换
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*/
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public class MapUtils {
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//π的定义
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public static double pi = 3.1415926535897932384626;
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//椭球长半径，依据克拉索索夫斯基椭球系数计算
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public static double a = 6378245.0;
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//第一偏心率的平方
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public static double ee = 0.00669342162296594323;
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public static double transformLat(double x, double y) {
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double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y
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+ 0.2 * Math.sqrt(Math.abs(x));
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ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
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ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
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return ret;
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}
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public static double transformLon(double x, double y) {
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double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1
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* Math.sqrt(Math.abs(x));
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ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
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ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0
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* pi)) * 2.0 / 3.0;
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return ret;
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}
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/***
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* 判断是否在中国范围之内
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* @param lat
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* @param lon
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* @return
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*/
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public static boolean outOfChina(double lat, double lon) {
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if (lon < 72.004 || lon > 137.8347) {
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return true;
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}
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if (lat < 0.8293 || lat > 55.8271) {
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return true;
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}
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return false;
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}
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/***
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* 把公式部分抽取出来
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* @param lat
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* @param lon
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* @return
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*/
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public static Gps transform(double lat, double lon) {
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if (outOfChina(lat, lon)) {
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return new Gps(lat, lon);
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}
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double dLat = transformLat(lon - 105.0, lat - 35.0);
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double dLon = transformLon(lon - 105.0, lat - 35.0);
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double radLat = lat / 180.0 * pi;
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double magic = Math.sin(radLat);
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magic = 1 - ee * magic * magic;
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double sqrtMagic = Math.sqrt(magic);
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dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
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dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
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double mgLat = lat + dLat;
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double mgLon = lon + dLon;
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return new Gps(mgLat, mgLon);
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}
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/***
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* wgs84到gcj02转换
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* @param lat
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* @param lon
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* @return
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*/
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public static Gps wgs84_To_Gcj02(double lat, double lon) {
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return transform(lat, lon);
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}
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/***
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* 简单的gcj02到wgs84坐标类型转换，只做了一次迭代
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*/
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public static Gps gcj02_To_Wgs84(double lat, double lon) {
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Gps gps = transform(lat, lon);
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double lontitude = lon * 2 - gps.lon;
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double latitude = lat * 2 - gps.lat;
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return new Gps(latitude, lontitude);
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}
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/***
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* 稍微精确一点的gcj02到wgs84转换
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* @param lat
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* @param lon
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* @return
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*/
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public static Gps gcj02_To_Wgs84_exact(double lat, double lon) {
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if (outOfChina(lat, lon)) {
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return gcj02_To_Wgs84(lat, lon);
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}
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double initDelta = 0.01;
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double threshold = 0.000001;
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double dLat = initDelta;
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double dLon = initDelta;
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double mLat = lat - dLat;
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double mLon = lon - dLon;
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double pLat = lat + dLat;
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double pLon = lon + dLon;
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double wgsLat = 0;
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double wgsLon = 0;
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int i = 0;
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while (true) {
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wgsLat = (mLat + pLat) / 2;
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wgsLon = (mLon + pLon) / 2;
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Gps tmp = wgs84_To_Gcj02(wgsLat, wgsLon);
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dLat = tmp.lat - lat;
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dLon = tmp.lon - lon;
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if ((Math.abs(dLat) < threshold) && (Math.abs(dLon) < threshold)) {
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break;
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}
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if (dLat > 0) {
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pLat = wgsLat;
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} else {
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mLat = wgsLat;
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}
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if (dLon > 0) {
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pLon = wgsLon;
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} else {
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mLon = wgsLon;
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}
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if (++i > 1000) break;
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}
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return new Gps(wgsLat, wgsLon);
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}
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/***
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* 百度坐标是在火星坐标基础上做的二次加密
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* @param gg_lat
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* @param gg_lon
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* @return
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*/
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public static Gps gcj02_To_Bd09(double gg_lat, double gg_lon) {
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double x = gg_lon, y = gg_lat;
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double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * pi);
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double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * pi);
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double bd_lon = z * Math.cos(theta) + 0.0065;
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double bd_lat = z * Math.sin(theta) + 0.006;
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return new Gps(bd_lat, bd_lon);
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}
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/***
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* 百度坐标与火星坐标逆向转换
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* @param bd_lat
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* @param bd_lon
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* @return
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*/
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public static Gps bd09_To_Gcj02(double bd_lat, double bd_lon) {
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double x = bd_lon - 0.0065, y = bd_lat - 0.006;
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double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * pi);
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double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * pi);
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double gg_lon = z * Math.cos(theta);
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double gg_lat = z * Math.sin(theta);
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return new Gps(gg_lat, gg_lon);
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}
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public static void main(String[] args) {
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Gps gps = new Gps(39.9072885060602, 116.39123343289631);
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System.out.println(gps);//{39.9072885060602,116.39123343289631}
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Gps gps2 = wgs84_To_Gcj02(gps.lat, gps.lon);
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System.out.println(gps2);//{39.9086897410389,116.39747455259267}
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Gps gps3 = gcj02_To_Wgs84(gps2.lat, gps2.lon);
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System.out.println(gps3);//{39.907286247736586,116.39123098626051}
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Gps gps4 = gcj02_To_Wgs84_exact(gps2.lat, gps2.lon);
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System.out.println(gps4);//{39.907288984202964,116.3912337078661} 相对一次迭代是精确了，但是好像也不是完全还原
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}
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}
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class Gps {
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double lat, lon;
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public Gps() {
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}
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public Gps(double lat, double lon) {
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this.lat = lat;
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this.lon = lon;
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}
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@Override
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public String toString() {
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return "{" + lat + "," + lon + "}";
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}
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}
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