Map projections

Map projections are used to map the curved surface of the Earth on a flat surface, such as a map.

Transversal Mercator projection most common in Sweden

In Sweden, Transversal Mercator projection, or Gauss-Krüger's projection as it is also called, is most often used, but there are also other projections.

Map projections always give some kind of distortions. Different map projections give different types of distortions.

It is often convenient to use a plane coordinate system for presentation of geospatial information. To relate a three-dimensional coordinate system to a flat two-dimensional system, a map projection is used.

In our collection of formulas you will find formulas for Gauss-Krüger's projection (pdf, new window).

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Questions and answers

Meridian convergence refers to the angular difference between "map north" and the true North direction.

The magnetic declination varies between approximately 2° in southwest Sweden and 8° in the northeast and is caused by the magnetic and geographical north poles not coinciding.

In connection with the service Compute meridian convergence, there is more information about both meridian convergence and misalignment.

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