Zusammenfassung
Summary
CAD or BIM supported planning of buildings such as the construction of bridges is regularly accomplished in local Cartesian coordinates based on the definition of the meter as unitary scale. In contrast, official geo data in Germany are defined in the coordinate reference frame ETRS89/UTM concerning plane projection and according elevation the normal heights with respect to DHHN2016. Using official geo base data in the planning of building projects as well as execution on site this lead to circumstances not to neglect readily in praxis.