原文地址:http://blog.csdn.net/a13570320979/article/details/51366355
一。在進(jìn)行地圖開(kāi)發(fā)過(guò)程中督函,我們一般能接觸到以下三種類型的地圖坐標(biāo)系:
1.WGS-84原始坐標(biāo)系,一般用國(guó)際GPS紀(jì)錄儀記錄下來(lái)的經(jīng)緯度,通過(guò)GPS定位拿到的原始經(jīng)緯度,Google和高德地圖定位的的經(jīng)緯度(國(guó)外)都是基于WGS-84坐標(biāo)系的铺纽;但是在國(guó)內(nèi)是不允許直接用WGS84坐標(biāo)系標(biāo)注的,必須經(jīng)過(guò)加密后才能使用哟忍;
2.GCJ-02坐標(biāo)系狡门,又名“火星坐標(biāo)系”,是我國(guó)國(guó)測(cè)局獨(dú)創(chuàng)的坐標(biāo)體系魁索,由WGS-84加密而成融撞,在國(guó)內(nèi)盼铁,必須至少使用GCJ-02坐標(biāo)系粗蔚,或者使用在GCJ-02加密后再進(jìn)行加密的坐標(biāo)系,如百度坐標(biāo)系饶火。高德和Google在國(guó)內(nèi)都是使用GCJ-02坐標(biāo)系鹏控,可以說(shuō),GCJ-02是國(guó)內(nèi)最廣泛使用的坐標(biāo)系肤寝;
3.百度坐標(biāo)系:bd-09当辐,百度坐標(biāo)系是在GCJ-02坐標(biāo)系的基礎(chǔ)上再次加密偏移后形成的坐標(biāo)系,只適用于百度地圖鲤看。(目前百度API提供了從其它坐標(biāo)系轉(zhuǎn)換為百度坐標(biāo)系的API缘揪,但卻沒(méi)有從百度坐標(biāo)系轉(zhuǎn)為其他坐標(biāo)系的API)
二。為什么會(huì)發(fā)生偏移义桂?
1.由于坐標(biāo)系之間不兼容找筝,如在百度地圖上定位的經(jīng)緯度拿到高德地圖上直接描點(diǎn)就肯定會(huì)發(fā)生偏移;只考慮國(guó)內(nèi)的情況慷吊,高德地圖和Google地圖是可以不經(jīng)過(guò)轉(zhuǎn)換也能夠準(zhǔn)確顯示的(在國(guó)內(nèi)用的都是GCJ-02坐標(biāo)系)袖裕;下面是收錄了網(wǎng)上的WGS-84,GCJ-02溉瓶,百度坐標(biāo)系(bd-09)之間的相互轉(zhuǎn)換的方法急鳄,經(jīng)測(cè)試,是轉(zhuǎn)換后相對(duì)準(zhǔn)確可用的:
代碼:
package com.zehin.map.util;
public class GPSUtil {
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;
}
/**
* 84 to 火星坐標(biāo)系 (GCJ-02) World Geodetic System ==> Mars Geodetic System
*
* @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};
}
/**
* * 火星坐標(biāo)系 (GCJ-02) to 84 * * @param lon * @param lat * @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};
}
/**
* 火星坐標(biāo)系 (GCJ-02) 與百度坐標(biāo)系 (BD-09) 的轉(zhuǎn)換算法 將 GCJ-02 坐標(biāo)轉(zhuǎn)換成 BD-09 坐標(biāo)
*
* @param lat
* @param lon
*/
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;
}
/**
* * 火星坐標(biāo)系 (GCJ-02) 與百度坐標(biāo)系 (BD-09) 的轉(zhuǎn)換算法 * * 將 BD-09 坐標(biāo)轉(zhuǎn)換成GCJ-02 坐標(biāo) * * @param
* bd_lat * @param bd_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;
}
/**將gps84轉(zhuǎn)為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;
}
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]);
//保留小數(shù)點(diǎn)后六位
gps84[0] = retain6(gps84[0]);
gps84[1] = retain6(gps84[1]);
return gps84;
}
/**保留小數(shù)點(diǎn)后六位
* @param num
* @return
*/
private static double retain6(double num){
String result = String .format("%.6f", num);
return Double.valueOf(result);
}
}
當(dāng)然 web端的javaScript的轉(zhuǎn)換代碼網(wǎng)上也有很多 可以經(jīng)過(guò)查閱得到堰酿。