fun geodeticToCartesian(lat: Double, lon: Double, alt: Double): Point3d {

        val srcCoord = ProjCoordinate(lon, lat, alt)
        val targetCoord = ProjCoordinate()
        WGS84_TO_ECEF.transform(srcCoord, targetCoord)
    
        return Point3d(targetCoord.x, targetCoord.y, targetCoord.z)
    }