百度坐标转换为Gps

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var tools = {}

/**
* 百度经纬度转Gps经纬度
* @returns {*} {lat, lon}
*/
tools.baiduToGps = function (lat, lon) { //百度经纬度转Gps经纬度
var a = 6378245.0;
var ee = 0.00669342162296594323;
var pi = 3.1415926535897932384626;

function bd09_To_Gcj02(bd_lat, bd_lon) {
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 * pi);
var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * pi);
var gg_lon = z * Math.cos(theta);
var gg_lat = z * Math.sin(theta);
var Gcj02 = {
lon: gg_lon,
lat: gg_lat
}

return Gcj02;
}

function gcj_To_Gps84(gcj_lat, gcj_lon) {
var gps = transform(gcj_lat, gcj_lon);
var lontitude = gcj_lon * 2 - gps.lon;
var latitude = gcj_lat * 2 - gps.lat;
var Gps84 = {
lon: lontitude,
lat: latitude
}

return Gps84;
}

function transform(lat, lon) {
if (outOfChina(lat, lon)) {
var out_jw = {
lat: lat,
lon: lon
}

return out_jw;
}
var dLat = transformLat(lon - 105.0, lat - 35.0);
var dLon = transformLon(lon - 105.0, lat - 35.0);
var radLat = lat / 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 mgLat = lat + dLat;
var mgLon = lon + dLon;
var transform_jw = {
lat: mgLat,
lon: mgLon
}

return transform_jw;
}

function outOfChina(lat, lon) {
if (lon < 72.004 || lon > 137.8347) {
return true;
}
if (lat < 0.8293 || lat > 55.8271) {
return true;
}
return false;
}

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 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;
}

var gcj_lat_lon = bd09_To_Gcj02(lat, lon);
return gcj_To_Gps84(gcj_lat_lon.lat, gcj_lat_lon.lon);
}
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