While ETRS89 is being promoted as Denmark’s principal reference system, a number of other older systems remain in use. It is possible to do transformations between reference systems using applications developed by the Danish Geodata Agency .
Both public and private geodata users can access the Danish Geodata Agency’s simple transformation tool. This tool is primarily used for transforming data from older reference systems to ETRS89 (reference system), DVR90 (height system) and UTM/ETRS89 (map projection). Click on ‘Simple Transformation’ to the right to access this tool (in Danish).
Transformation functions are generally built into GIS systems, but most come from the US market and are not equipped to handle transformations based on Danish reference systems.
The transformation library developed by the Danish Geodata Agency provides highly accurate transformation results for both planar and vertical reference systems.
KMSTrans: A graphical user interface for windows wrapping the transformation library. Transforms coordinates in 'interactive mode' as well as files in various formats - including ESRI-shapefiles. The link to the right points to a zip-file which should be unzipped to some location on your computer. Refer to the installation documentation in the unzipped folder.
KMSTrLib: The transformation library itself - for developers who wish to build their own software. The link refers to a zip-file which contains precompiled binaries for win32, win64 and bindings to python, java and C#. Refer to the documentation in the unzipped folder.
Geoids (important): Both products will need a compatible geoid library to run. This should also be downloaded and unzipped from the link to the right. Older geoid libraries are not compatible with the newest version of GeodatastyrelsenTrans and GeodatastyrelsenTrLib, so be sure to select the most recent version.
Click on the links to the right to access these.
All geodata users in Denmark are encouraged to conduct transformations with the Danish Geodata Agency’s transformation applications.