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DVR90

The national altitude reference system DVR90 is increasingly used to measure altitude in Denmark. This system was built upon a precision levelling survey conducted in 1990. It uses the 1990 sea level measured by the Danish Meteorological Institute's sea level gauge as a reference point. The system’s benchmark altitude of 5.570 metres is based on a marker located in Århus Cathedral.

DVR90 was launched in May 2002 after 10 years of development. This process included updating the National Survey and Cadastre’s geoid model to include DVR90 figures and calculating DVR90 values for all of the country’s altitude markers. This has led to an improvement in GPS altitude readings across Denmark, with a current accuracy within one or two centimetres.

Until January 1, 2006, the National Survey and Cadastre continued to update and manage the country’s earlier altitude systems, including the most widely used DNN.  Geodata users are now encouraged to transform their existing data to DVR90 and to begin new projects with DVR90 as the baseline. The National Survey and Cadastre supported these users’ transition to DVR90 through the provision of transformation programmes.

Read more about the DNN to DVR90 transformation programme and other transformation programmes under Transformation.

The DVR90 altitude system also provides altitude data to the REFDK and 10 km Net reference networks.