ETRS89horisontaalia

ETRS89 is a geodetic reference system used in Europe. It is derived from the realization of the World Geodetic System 1984 (WGS84) at epoch 1989.0. The ETRS89 coordinate system is used as a fundamental system for all European countries, and it is intended to provide a common frame of reference for national geodetic systems.

ETRS89 is based on the European Datum 1989 (ED89) and is defined by a set of geodetic parameters, including the Earth's semi-major axis, the eccentricity of the ellipsoid, and the origin at the conventional geodetic latitude and longitude of the 1899 Paris Observatory. It is a Cartesian coordinate system in three dimensions, utilizing the three-dimensional coordinates of the WGS84 ellipsoid.

ETRS89 is primarily used for mapping and surveying purposes in Europe. It has been implemented in many countries, and its use is encouraged by the European Association of National G.N.S. (EUREF) for all applications requiring a common European reference system. ETRS89 is designed to be used in conjunction with the ETRS89-PRN transformation parameters, which allow for the conversion of coordinates from the national systems to the ETRS89 system.

The ETRS89 system has undergone several updates and refinements over the years, with improvements made to its ellipsoidal model and tham dynamic reference system improvements. The development and implementation of ETRS89 has been facilitated by collaboration among European nations and international organizations, such as the European Commission and the Scientific Committee on Earth Observations.