Abstract
Geospatial data gained from different sources have to be referenced to the same geodetic datum and coordinate system. Forming of joint reference system enables easier update and geometric harmonization, access, exchange and use of geospatial data. Horizontal and vertical positions of points are no longer independent components. Development of GPS technology enabled their integration into the unique 3D datum. Geodetic datum is a base for determination the spatial reference system. Reference system is a group of fundamental points on the Earth surface with defined coordinates. The International Terrestrial Reference System (ITRS) is the most accurate global reference system. ETRS89 is used as the standard accurate GPS coordinate system in Europe. This system is a spine of every geographic and geodynamic project on the European territory, both on a national and international level.
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