Control points and benchmarks

The NLS benchmark register contains information about control points and bench-marks. Most of these horizontal control points and levelling benchmarks are measured by the NLS. Some benchmarks measured by other agencies are also included.

Benchmarks are determined by spirit levelling. Horizontal control points are measured by satellite surveying. This technique has replaced the old method of triangulation. The horizontal coordinate system used is called kkj and the height system is N60.

Within the NLS, control surveys are carried out by Uusimaa and North Ostrobothnia District Survey Offices. They are also responsible for maintaining the system of horizontal control points and benchmarks in their operating areas. The units also provide expert and measurement services related to geodetic measurements and coordinate and height systems.

The Finnish Coordinate Reference Systems (pdf, 619 kt)
Contents:
1. Introduction
2. Reference ellipsoids and map projections used in Finland
3. The ETRS89 coordinates in Finland
4. New horizontal coordinate reference systems
5. Previous horizontal coordinate reference systems
6. Transformation between the EUREF-FIN and kkj coordinates
7. References

For more information about benchmarks, please contact:

Benchmarks and levelling:
Matti Musto, tel +358 40 779 3718
E-mail: firstname.lastname@maanmittauslaitos.fi

Horizontal control points and GPS measurement:
Marko Ollikainen, tel +358 40 779 3726
E-mail: firstname.lastname@maanmittauslaitos.fi

For more information about benchmarks, please contact the Uusimaa District Survey Office (orders and price list) or go to the MapSite ordering service.