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不同坐标系经纬度转换(天地图,高德,百度,腾讯)
- HTML&JS
- 2022-09-02
- 1051人已阅读
1.js转换代码
var x_pi = 3.14159265358979324 *3000.0 / 180.0;
var pi = 3.14159265358979324;
var a = 6378245.0;
var ee = 0.00669342162296594323;
function transformLon(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 * 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;
};
function transformLat(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 * 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;
}
function outOfChina(lat, lon) {
if (lon < 72.004 || lon > 137.8347)
return true;
if (lat < 0.8293 || lat > 55.8271)
return true;
return false;
}
/*
* WGS-84:是国际标准,GPS坐标(Google Earth使用、或者GPS模块、天地图)
* GCJ-02:中国坐标偏移标准,Google Map、高德、腾讯使用
* BD-09:百度坐标偏移标准,Baidu Map使用
*/
/**
* wgLat 纬度
* wgLon 经度
* WGS-84 到 GCJ-02 的转换(即 GPS 加偏)
* */
function wgs_gcj_encrypts(wgLat, wgLon) {
var point={};
if (outOfChina(wgLat, wgLon)) {
point.lat=wgLat;
point.lng=wgLon;
return point;
}
var dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
var dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
var radLat = wgLat / 180.0 * 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) * pi);
dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
var lat = wgLat + dLat;
var lon = wgLon + dLon;
point.lat=lat;
point.lon=lon;
return point;
};
/**
* wgLat 纬度
* wgLon 经度
* BD-09转换GCJ-02
* 百度转google
* */
function bd_google_encrypt(bd_lat, bd_lon){
var point={};
var x = bd_lon - 0.0065;
var y = bd_lat - 0.006;
var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
var theta =Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
var gg_lon = z * Math.cos(theta);
var gg_lat = z * Math.sin(theta);
point.lat=gg_lat;
point.lon=gg_lon;
return point;
};
/**
* gg_lat 纬度
* gg_lon 经度
* GCJ-02转换BD-09
* Google地图经纬度转百度地图经纬度
* */
function google_bd_encrypt(gg_lat, gg_lon){
var point={};
var x = gg_lon;
var y = gg_lat;
var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
var bd_lon = z * Math.cos(theta) + 0.0065;
var bd_lat = z * Math.sin(theta) + 0.006;
point.lat=bd_lat;
point.lon=bd_lon;
return point;
};
2.实例
复制代码
//从服务器获取的(硬件/谷歌)的经纬度
lngMy = Number(dataLocker.gps.lng);
latMy = Number(dataLocker.gps.lat);
//调用上面代码中的wgs_gcj_encrypts方法转成高德的经纬度
var point = wgs_gcj_encrypts(latMy,lngMy);
//刷新展示的手机端的高德地图上
latMy = point.lat.toFixed(6);
lngMy = point.lon.toFixed(6);
reLocate();
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