public function init($def = null)
    {
        // Place parameters in static storage for common use

        $this->sin_p14 = sin( $this->lat0 );
        $this->cos_p14 = cos( $this->lat0 );

        // Approximation for projecting points to the horizon (infinity)
        $this->infinity_dist = 1000 * $this->a;
        $this->rc = 1;
    }