Two-dimensional systems

Some of our older reference systems are two-dimensional, meaning that they do not have a direct connection to the height component.

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

For practical purposes it is easier to use plane coordinates 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 given here.

More information about map projections.

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