Two-dimensional systems

Some of our older reference systems are two-dimensional. This means that they do not include height information unlike the more modern three-dimensional systems.

RT 90 and RT 38 are examples of Swedish two-dimensional reference systems. Plane coordinate systems are also often connected to a three-dimensional reference system by a map projection, e.g. SWEREF 99 TM.

For practical purposes it is often easier to use plane coordinates rather than geographic or three-dimensional coordinates. A plane coordinate system is therefore often used to define positions.

Information about some Swedish plane coordinate systems is presented on these pages. You can also find more information about map projections.

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