/// <summary>
/// Returns distance in meters between two cities
/// </summary>
public float Distance(City city1, City city2)
{
PolygonPoint latlon1 = _map.GetLatLonFromSpherePoint(city1.unitySphereLocation);
PolygonPoint latlon2 = _map.GetLatLonFromSpherePoint(city2.unitySphereLocation);
return(Distance(latlon1.Xf, latlon1.Yf, latlon2.Xf, latlon2.Yf));
}