百度地圖與騰訊地圖經緯度互轉

function bdMap_to_txMap(lat,lng){
    pi = 3.14159265358979324 * 3000.0 / 180.0;
    x = lng - 0.0065;
    y = 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);
    lng = z * Math.cos(theta);
    lat = z * Math.sin(theta);
    return {'lng':lng,'lat':lat};
}
           

function txMap_to_bdMap(lat,lng){
        pi = 3.14159265358979324 * 3000.0 / 180.0;
        x = lng;
        y = lat;
        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);
        lng = z * Math.cos(theta) + 0.0065;
        lat = z * Math.sin(theta) + 0.006;
        return {'lng':lng,'lat':lat};
    }