wgs84 坐标、gcj02坐标相互转换
package com.example.demo.util;import com.example.demo.dto.json.vo.Gps;/**** wgs84 84年提出，大地坐标，也是原始坐标。* 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* 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* 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。*/
public class GpsTransfer {//π的定义public static double pi = 3.1415926535897932384626;//椭球长半径，依据克拉索索夫斯基椭球系数计算public static double a = 6378245.0; //第一偏心率的平方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;}/**** 判断是否在中国范围之内* @param lat* @param lon* @return*/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;}/**** 把公式部分抽取出来* @param lat* @param lon* @return*/public static Gps transform(double lat, double lon) {if (outOfChina(lat, lon)) {return new Gps(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 Gps(mgLat, mgLon);}/**** wgs84到gcj02转换* @param lat* @param lon* @return*/public static Gps wgs84_To_Gcj02(double lat, double lon) {return transform(lat, lon);}/**** 简单的gcj02到wgs84坐标类型转换，只做了一次迭代*/public static Gps gcj02_To_Wgs84(double lat, double lon) {Gps gps = transform(lat, lon);double lontitude = lon * 2 - gps.getLon();double latitude = lat * 2 - gps.getLat();return new Gps(latitude, lontitude);}/**** 稍微精确一点的gcj02到wgs84转换* @param lat* @param lon* @return*/public static Gps gcj02_To_Wgs84_exact(double lat,double lon) {if (outOfChina(lat, lon)) {return gcj02_To_Wgs84(lat, lon);}double initDelta = 0.01;double threshold = 0.000001;double dLat = initDelta;double dLon = initDelta;double mLat = lat - dLat;double mLon = lon - dLon;double pLat = lat + dLat;double pLon = lon + dLon;double wgsLat = 0;double wgsLon = 0;int i = 0;while (true) {wgsLat = (mLat + pLat) / 2;wgsLon = (mLon + pLon) / 2;Gps tmp = wgs84_To_Gcj02(wgsLat, wgsLon);dLat = tmp.getLat() - lat;dLon = tmp.getLon() - lon;if ((Math.abs(dLat) < threshold) && (Math.abs(dLon) < threshold)) {break;}if (dLat > 0) { pLat = wgsLat; } else { mLat = wgsLat;}if (dLon > 0) { pLon = wgsLon; } else { mLon = wgsLon;}if (++i > 1000) break;}return new Gps(wgsLat, wgsLon);}/**** 百度坐标是在火星坐标基础上做的二次加密* @param gg_lat* @param gg_lon* @return*/public static Gps gcj02_To_Bd09(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 * pi);double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * pi);double bd_lon = z * Math.cos(theta) + 0.0065;double bd_lat = z * Math.sin(theta) + 0.006;return new Gps(bd_lat, bd_lon);}/**** 百度坐标与火星坐标逆向转换* @param bd_lat* @param bd_lon* @return*/public static Gps bd09_To_Gcj02(double bd_lat, double bd_lon) {double x = bd_lon - 0.0065, y = bd_lat - 0.006;double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * pi);double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * pi);double gg_lon = z * Math.cos(theta);double gg_lat = z * Math.sin(theta);return new Gps(gg_lat, gg_lon);}}com.example.demo.dto.json.vo.Gps:
package com.example.demo.dto.json.vo;import lombok.Data;
import lombok.EqualsAndHashCode;@Data
@EqualsAndHashCode(callSuper = false)
public class Gps {private Double lon;private Double lat;public Gps() {}public Gps(double lat, double lon) {this.lat = lat;this.lon = lon;}@Overridepublic String toString() {return "{" + lat + "," + lon + "}";}
}
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——BioInformatics Agent (BIA))
