Spatial reference
Our society needs spatial information in a diverse and reliable manner, whereby this must be designed with a clear reference to the earth (spatial reference) for the purpose of universal application. The spatial reference is realized by the official surveying system with the geodetic fixed point field according to valid geodetic principles.
In Baden-Württemberg, the standardized nationwide fixed point field includes the 1st and 2nd order elevation fixed points. In the course of the introduction of the uniform integrated geodetic spatial reference 2016, the official heights for these points were changed to the new official height reference system German Main Height Network 2016 (DHHN2016) on June 30, 2017 (EPSG code: 7837). The designation is: "Height above mean sea level (NHN)" in DHHN2016 (status 170).
In this context, the network of level reference points (3rd order) of the state of Baden-Württemberg was not transferred to the new height reference system DHHN2016 by the responsible State Office for Geoinformation and Land Development (LGL).
Stuttgart city elevation network
The elevation control points of the state are supplemented in the city district of Stuttgart by a close-meshed urban elevation network. The Stuttgart city height network currently comprises approx. 3540 level points and, as a 4th order network, is not part of the 3rd order level point field.
For the points of the Stuttgart city height network, in accordance with the procedure of the LGL for 3rd order points, no change of the height reference system was made. For them, the official height reference system Deutsches Haupthöhennetz 1912 (DHHN12) was retained (EPSG code: 7699). The height designation is: "Height above sea level (NN)" in DHHN12 (status 130).
The elevation transformation service provided by the LGL can be used to transform elevations between the DHHN12 and DHHN2016 elevation reference frames.
For more information on the Height Transformation Service, please visit the website of the State Office for Geoinformation and Land Development (opens in a new tab).
Information on the urban elevation benchmarks can be obtained from the Customer Center of the City Surveying Office.