webmercator to geographic Conversion equation

tanyabisen

Hi all,

Does anyone know the formula to convert webmercator to geographic coordinates


Thanks,
Tanya Bisen

FrancescaRiolo

Would this be the right formulas found at:
http://www.gal-systems.com/2011/07/convert-coordinates-between-web.html
private void ToWebMercator(ref double mercatorX_lon, ref double mercatorY_lat)
{
    if ((Math.Abs(mercatorX_lon) > 180 || Math.Abs(mercatorY_lat) > 90))
        return;

    double num = mercatorX_lon * 0.017453292519943295;
    double x = 6378137.0 * num;
    double a = mercatorY_lat * 0.017453292519943295;

    mercatorX_lon = x;
    mercatorY_lat = 3189068.5 * Math.Log((1.0 + Math.Sin(a)) / (1.0 - Math.Sin(a)));