Function enu2ecef 

pub fn enu2ecef(
    e: f64,
    n: f64,
    u: f64,
    lat0: f64,
    lon0: f64,
    alt0: f64,
    r_ellips: Ellipsoid,
) -> (f64, f64, f64)

Returns the tuple (x,y,z) of coordinates in the ECEF system

Inputs:

• e = east coordinate [m] from reference geodetic location
• n = north coordinate [m] from reference geodetic location
• u = up coordinate [m] from reference geodetic location
• lat0 = reference latitude [rad]
• lon0 = reference longitude [rad]
• alt0 = reference altitude [m]
• r_ellips = reference ellipsoid, defaults ref. frame is WGS84

Outputs:

• x = x ECEF coordinate [m]
• y = y ECEF coordinate [m]
• z = z ECEF coordinate [m]