openSysMap调用第三方导航坐标转gps坐标JS，解决坐标偏离问题

很强，刚开始存入库中的全部是BD-0911坐标，直接调用第三方导航后偏差的太严重，现在用这个转换以后导航偏差基本不太大了，下面就附上我的调用方式

//在需要导航的页面引入
<script type="text/javascript" src="gps.js"></script>
//导航下面的obj是我从数据库中取出来的目的地信息
function navigateWithMap(){
//BD-09 to GCJ-02先将百度坐标转成中国坐标
var tmp = GPS.bd_decrypt(parseFloat(obj.baidu_lat),parseFloat(obj.baidu_lng));
//GCJ-02 to WGS-84再将中国坐标转成GPS坐标
var dstarr = GPS.gcj_decrypt_exact(tmp['lat'],tmp['lon']);

var dst = new plus.maps.Point(dstarr['lon'],dstarr['lat']); //目的地  
var shop = obj.name_info;  
map.showUserLocation( true );  
map.getUserLocation(function(state,pos){  
    if(0==state){  
        var src = new plus.maps.Point(pos.longitude,pos.latitude); //起始地  
        // 调用系统地图显示   
        plus.maps.openSysMap( dst, shop, src );  
    }  
});

}

7***@qq.com

obj是在什么地方定义的？

2016-07-14 11:25
老火

obj是ajax回来的数据

2016-08-16 15:50
尔梭

貌似在IOS上使用系统自带地图导航只能用GCJ-02才准确，用WGS-84偏差太大，但是安卓上必须要用WGS-84才准确

2016-11-02 09:21
9***@qq.com

回复老火:你好，为什么在var tmp = GPS.bd_decrypt(parseFloat(obj.baidu_lat),parseFloat(obj.baidu_lng)); 这一行老是报错呢

2017-02-16 16:24
9***@qq.com

能把你的那个gps.js给我吗我估计是这个原因

2017-02-16 16:43

小谭

牛逼

qiuxiaojun - aaaaaa

不错

我本善良

谢谢，解决了一直困扰我的问题，现在调用高德导航基本0误差。

9***@qq.com

你好，我问一下那个导航偏差怎么解决呢

2017-02-16 16:52
我本善良

回复 9***@qq.com:

var GPS = {

PI : 3.14159265358979324,

x_pi : 3.14159265358979324 3000.0 / 180.0,

delta : function (lat, lon)

{

// Krasovsky 1940

//

// a = 6378245.0, 1/f = 298.3

// b = a (1 - f)

// ee = (a^2 - b^2) / a^2;

var a = 6378245.0;

var ee = 0.00669342162296594323;

var dLat = this.transformLat(lon - 105.0, lat - 35.0);

var dLon = this.transformLon(lon - 105.0, lat - 35.0);

var radLat = lat / 180.0 this.PI;

var magic = Math.sin(radLat);

magic = 1 - ee magic magic;

var sqrtMagic = Math.sqrt(magic);

dLat = (dLat 180.0) / ((a (1 - ee)) / (magic sqrtMagic) this.PI);

dLon = (dLon 180.0) / (a / sqrtMagic Math.cos(radLat) this.PI);

return {'lat': dLat, 'lon': dLon};

},

//WGS-84 to GCJ-02

gcj_encrypt : function (wgsLat, wgsLon)

{

if (this.outOfChina(wgsLat, wgsLon))

return {'lat': wgsLat, 'lon': wgsLon};

var d = this.delta(wgsLat, wgsLon);

return {'lat' : wgsLat + d.lat,'lon' : wgsLon + d.lon};

},

//GCJ-02 to WGS-84

gcj_decrypt : function (gcjLat, gcjLon)

{

if (this.outOfChina(gcjLat, gcjLon))

return {'lat': gcjLat, 'lon': gcjLon};

var d = this.delta(gcjLat, gcjLon);

return {'lat': gcjLat - d.lat, 'lon': gcjLon - d.lon};

},

//GCJ-02 to WGS-84 exactly

gcj_decrypt_exact : function (gcjLat, gcjLon) {

var initDelta = 0.01;

var threshold = 0.000000001;

var dLat = initDelta, dLon = initDelta;

var mLat = gcjLat - dLat, mLon = gcjLon - dLon;

var pLat = gcjLat + dLat, pLon = gcjLon + dLon;

var wgsLat, wgsLon, i = 0;

while (1) {

wgsLat = (mLat + pLat) / 2;

wgsLon = (mLon + pLon) / 2;

var tmp = this.gcj_encrypt(wgsLat, wgsLon)

dLat = tmp.lat - gcjLat;

dLon = tmp.lon - gcjLon;

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 > 10000) break;

}

//console.log(i);

return {'lat': wgsLat, 'lon': wgsLon};

},

//GCJ-02 to BD-09

bd_encrypt : function (gcjLat, gcjLon)

{

var x = gcjLon, y = gcjLat;

var z = Math.sqrt(x x + y y) + 0.00002 Math.sin(y this.x_pi);

var theta = Math.atan2(y, x) + 0.000003 Math.cos(x this.x_pi);

bdLon = z Math.cos(theta) + 0.0065;

bdLat = z Math.sin(theta) + 0.006;

return {'lat' : bdLat,'lon' : bdLon};

},

//BD-09 to GCJ-02

bd_decrypt : function (bdLat, bdLon)

{

var x = bdLon - 0.0065, y = bdLat - 0.006;

var z = Math.sqrt(x x + y y) - 0.00002 Math.sin(y this.x_pi);

var theta = Math.atan2(y, x) - 0.000003 Math.cos(x this.x_pi);

var gcjLon = z Math.cos(theta);

var gcjLat = z Math.sin(theta);

return {'lat' : gcjLat, 'lon' : gcjLon};

},

distance : function (latA, logA, latB, logB) {

var earthR = 6371000;

var x = Math.cos(latAMath.PI/180) Math.cos(latBMath.PI/180) Math.cos((logA-logB)Math.PI/180);

var y = Math.sin(latAMath.PI/180) Math.sin(latBMath.PI/180);

var s = x + y;

if (s > 1)

s = 1;

if (s < -1)

s = -1;

var alpha = Math.acos(s);

var distance = alpha earthR;

return distance;

},

outOfChina : function (lat, lon)

{

if (lon < 72.004 || lon > 137.8347)

return true;

if (lat < 0.8293 || lat > 55.8271)

return true;

return false;

},

transformLat : function (x, y)

{

var 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 this.PI) + 20.0 Math.sin(2.0 x this.PI)) 2.0 / 3.0;

ret += (20.0 Math.sin(y this.PI) + 40.0 Math.sin(y / 3.0 this.PI)) 2.0 / 3.0;

ret += (160.0 Math.sin(y / 12.0 this.PI) + 320 Math.sin(y this.PI / 30.0)) 2.0 / 3.0;

return ret;

},

transformLon : function (x, y)

{

var 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 this.PI) + 20.0 Math.sin(2.0 x this.PI)) 2.0 / 3.0;

ret += (20.0 Math.sin(x this.PI) + 40.0 Math.sin(x / 3.0 this.PI)) 2.0 / 3.0;

ret += (150.0 Math.sin(x / 12.0 this.PI) + 300.0 Math.sin(x / 30.0 this.PI)) 2.0 / 3.0;

return ret;

}

};

//选项卡点击事件

mui('.mui-bar').on('tap', 'a', function(e) {

var targetTab = this.getAttribute('id');

if(targetTab == "map")

{

if(Coordinates == "")

{

mui.toast("对不起，当前客户没有标注坐标信息！");

}

else

{

///调用第三方导航

var map = Coordinates.split(",");

var lon = map[0];

var lat = map[1];

//BD-09 to GCJ-02先将百度坐标转成中国坐标

var gcj02 = GPS.bd_decrypt(parseFloat(lat),parseFloat(lon));

//GCJ-02 to WGS-84再将中国坐标转成GPS坐标

var dstarr = GPS.gcj_decrypt_exact(gcj02['lat'],gcj02['lon']);

plus.maps.openSysMap( new plus.maps.Point(dstarr['lon'],dstarr['lat']), CustomerName, new plus.maps.Point() );

}

}

});

2017-03-15 15:39