1.js转换代码

  1 //转换常数
  2     var x_pi = 3.14159265358979324 * 3000.0 / 180.0;
  3     var pi = 3.14159265358979324;
  4     var a = 6378245.0;
  5     var ee = 0.00669342162296594323;
  6  
  7     function transformLon(x, y) {
  8         var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
  9         ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
 10         ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
 11         ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
 12         return ret;
 13     };
 14     
 15     function transformLat(x, y) {
 16         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));
 17         ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
 18         ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
 19         ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
 20         return ret;
 21     }
 22     
 23     function outOfChina(lat, lon) {
 24         if (lon < 72.004 || lon > 137.8347)
 25             return true;
 26         if (lat < 0.8293 || lat > 55.8271)
 27             return true;
 28         return false;
 29     }
 30     
 31 /*    
 32  * WGS-84：是国际标准，GPS坐标（Google Earth使用、或者GPS模块、天地图）
 33  * GCJ-02：中国坐标偏移标准，Google Map、高德、腾讯使用
 34  * BD-09：百度坐标偏移标准，Baidu Map使用
 35 */
 36     
 37     /**
 38      * wgLat 纬度
 39      * wgLon 经度
 40      * WGS-84 到 GCJ-02 的转换（即 GPS 加偏）
 41      * */
 42     function wgs_gcj_encrypts(wgLat, wgLon) {
 43         var point={};
 44         if (outOfChina(wgLat, wgLon)) {
 45             point.lat=wgLat;
 46             point.lng=wgLon;
 47             return point;
 48         }
 49         var dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
 50         var dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
 51         var radLat = wgLat / 180.0 * pi;
 52         var magic = Math.sin(radLat);
 53         magic = 1 - ee * magic * magic;
 54         var sqrtMagic = Math.sqrt(magic);
 55         dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
 56         dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
 57         var lat = wgLat + dLat;
 58         var lon = wgLon + dLon;
 59         point.lat=lat;
 60         point.lon=lon;
 61         return point;
 62     };
 63     
 64     
 65     /**
 66      * wgLat 纬度
 67      * wgLon 经度
 68      * BD-09转换GCJ-02
 69      * 百度转google
 70      * */
 71     function bd_google_encrypt(bd_lat, bd_lon){
 72         var point={};
 73         var x = bd_lon - 0.0065;
 74         var y = bd_lat - 0.006;  
 75         var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);  
 76         var theta =Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);  
 77         var gg_lon = z * Math.cos(theta);  
 78         var gg_lat = z * Math.sin(theta);  
 79         point.lat=gg_lat;
 80         point.lon=gg_lon;
 81         return point;
 82     };
 83     
 84  
 85     /**
 86      * gg_lat 纬度
 87      * gg_lon 经度
 88      * GCJ-02转换BD-09
 89      * Google地图经纬度转百度地图经纬度
 90      * */
 91     function google_bd_encrypt(gg_lat, gg_lon){
 92         var point={};
 93         var x = gg_lon;
 94         var y = gg_lat;
 95         var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
 96         var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi); 
 97         var bd_lon = z * Math.cos(theta) + 0.0065;
 98         var bd_lat = z * Math.sin(theta) + 0.006;
 99         point.lat=bd_lat;
100         point.lon=bd_lon;
101         return point;
102     };

2.实例

 1    //从服务器获取的（硬件/谷歌）的经纬度
 2         lngMy = Number(dataLocker.gps.lng);
 3         latMy = Number(dataLocker.gps.lat);
 4         
 5         //调用上面代码中的wgs_gcj_encrypts方法转成高德的经纬度
 6         var point = wgs_gcj_encrypts(latMy,lngMy);
 7        
 8        //刷新展示的手机端的高德地图上
 9         latMy = point.lat.toFixed(6);
10         lngMy = point.lon.toFixed(6);
11         reLocate();

第二种：

转换插件：https://github.com/CntChen/tile-lnglat-transform