经纬度与墨卡托互相转换

//经纬度转墨卡托
public Vector2D lonLat2Mercator(Vector2D lonLat)
{
Vector2D mercator = new Vector2D();
double x = lonLat.X * 20037508.34 / 180;
double y = Math.Log(Math.Tan((90 + lonLat.Y) * Math.PI / 360)) / (Math.PI / 180);
y = y * 20037508.34 / 180;
mercator.X = x;
mercator.Y = y;
return mercator;
}
//墨卡托转经纬度
public Vector2D Mercator2lonLat(Vector2D mercator)
{
Vector2D lonLat = new Vector2D();
double x = mercator.X / 20037508.34 * 180;
double y = mercator.Y / 20037508.34 * 180;
y = 180 / Math.PI * (2 * Math.Atan(Math.Exp(y * Math.PI / 180)) - Math.PI / 2);
lonLat.X = x;
lonLat.Y = y;
return lonLat;
}