European Terrestrial Reference System 1989

The European Terrestrial Reference System 1989 ( ETRS89 ) is a three-dimensional geodetic reference system. It was built by the European sub-committee of the IAG ( EUREF ) defined as fixed to the stable part of the Eurasian continental plate and be identical to the ITRS to the epoch 1989.0. ETRS89 is of EUREF realized by sporadically published ETRF_YY ( European Terrestrial Reference Frame [ with designation of the year] ) - three-dimensional coordinates and velocities of selected fixed points, which with global measurement methods, such as VLBI, Satellite Laser Ranging (SLR ), Global Positioning System ( GPS) and Doppler Orbitography and Radio Positioning Integrated by Satellite (DORIS ) are obtained. These points form the hierarchy level A of the ETRF. Was the late 1980s and early 1990s still mobile measurement campaigns on ground control points market place, the ETRS89 today at the European level by continuous GPS measurements at the station points of the EPN ( EUREF Permanent GPS Network) is obtained. Through the long observation times and the stability of itself present on solid structures points, an average accuracy of the coordinates of a few millimeters. The station velocities reflect the motion of the earth's crust within the Eurasian plate. The ETRS89 was recommended by the EU as a uniform reference system for European spatial data.

For the Period 1st January 1989, the coordinates from WGS84 and ETRS89 diverged by less than a meter, so both systems can be viewed within that location accuracy than the same.

The geophysical system ETRS89 (see Geodetic datum ) has been assigned as bestanpassende computing the geometric surface reference ellipsoid GRS80.

ETRS89 and the Surveying Authorities of the States of the Federal Republic of Germany

In Germany, the Working Committee of the Surveying Authorities of the States of the Federal Republic of Germany has approved the introduction of the ETRS89 as a unified official position reference system for the whole of Germany in 1991 ( AdV ). Then a national compression level of the hierarchy B of EUREF network for Germany and DREF as a hierarchy level C Füllnetze of countries were created C networks (eg SNREF for Saxony). Today, the ETRS89 in Germany is by SAPOS, the Satellite Positioning Service of the German State Survey, highly accurate, homogeneous and implemented nationwide for all areas of surveying.

In 1995, the AdV has decided to adopt ETRS89 in conjunction with the UTM projection (see UTM coordinate system). With this decision, the obligation to transfer the components of the real estate cadastre in the ETRS89/UTM for all surveying authorities of the federal states.