坐标转换：WGS-84 转 GCJ-02
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// WGS-84 转 GCJ-02
wgs84ToGcj02(lng, lat) {
var pi = 3.1415926535897932384626;
var a = 6378245.0;
var ee = 0.00669342162296594323;
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 transformLng(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 dLat = transformLat(lng - 105.0, lat - 35.0);
var dLng = transformLng(lng - 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);
dLng = (dLng * 180.0) / ((a / sqrtMagic) * Math.cos(radLat) * pi);
var mgLat = lat + dLat;
var mgLng = lng + dLng;
var newCoord = {
lng: mgLng,
lat: mgLat,
};
return newCoord;
},
This post is licensed under CC BY 4.0 by the author.