The projection is called ETRS-GKn, where n is the latitude of the central meridian,
13 zone system of 1°-width (19°, 20°, 21°…31°).
The origin of the coordinate system is in the cross of equator and the central meridian
of the zone.
False easting of 500 000 m is used in order to avoid negative coordinate values
on ETRS89 with GRS80-ellipsoid.