dvdoug / PHPCoord

     * Reference values for transformation are taken from http://www.globalmapper.com/helpv9/datum_list.htm

     * @return LatLng

     */

    public function toED50(): LatLng

    {

        if ($this->refEll == RefEll::international1924()) {

            return $this;

        }

        $asWGS84 = $this->toWGS84();

        $tx = 87;

        $ty = 98;

        $tz = 121;

        $s = 0;

        $rx = deg2rad(0);

        $ry = deg2rad(0);

        $rz = deg2rad(0);

        return $asWGS84->transformDatum(RefEll::international1924(), $tx, $ty, $tz, $s, $rx, $ry, $rz);

    }

    /**

     * Convert this LatLng object to NAD27 datum.

     * Reference values for transformation are taken from Wikipedia

     * @return LatLng

     */

    public function toNAD27(): LatLng

    {

        if ($this->refEll == RefEll::clarke1866()) {

            return $this;

        }

        $asWGS84 = $this->toWGS84();

        $tx = 8;

        $ty = -160;

        $tz = -176;

        $s = 0;

        $rx = deg2rad(0);

        $ry = deg2rad(0);

        $rz = deg2rad(0);

        return $asWGS84->transformDatum(RefEll::clarke1866(), $tx, $ty, $tz, $s, $rx, $ry, $rz);

    }

    /**

     * Convert this LatLng object to Ireland 1975 datum.