Property boundaries are marked with boundary markers in the terrain when forming a property. Boundary markers indicate the boundary lines of a property. A boundary can also be a natural terrain formation, such as a shore, drainage ditch or road. In sparsely populated areas, boundary markers have been defined with an accuracy of approx. 20 cm by GPS measurement since 2005. Coordinates of earlier boundary markers have been defined either by image measurement from aerial photographs or by digitalisation from maps. The accuracy of these boundary markers varies in general between 50 cm and 4 m, over 4 m in some cases. The accuracy of a boundary marker is indicated by its RSK value.

In population centres, the Cadastral index map is mainly based on the municipality's large scale base map material in the plans, the property data of which has been updated.

There can be inaccuracies in the location data of the Cadastral index map, because there are no exact coordinates for all boundary markers. The area of a register unit is shown in more detail in the cadastral survey documents (available in the archives of the keeper of the cadastral registry) and the terrain than on the Cadastral index map.

More information, report on positional accuracy of boundary markers in the Cadastral index map (in Finnish) http://www.maanmittauslaitos.fi/sites/maanmittauslaitos.fi/files/old/Nro_112_Kiinteistorekisterikartan_rajamerkkien_sijaintitarkkuus.pdf

National Land Survey of Finland customerservice@nls.fi

The product belongs to the open data of the National Land Survey of Finland. Open data license http://www.maanmittauslaitos.fi/en/maps-and-spatial-data/expert-users/en-maastotiedot-ja-niiden-hankinta/open-data-cc-40-licence. More information: Topographic data and how to acquire it http://www.maanmittauslaitos.fi/en/maps-and-spatial-data/expert-users/topographic-data-and-how-acquire-it.

The Cadastral index map is available as nationwide or in selected parts with limited areas or data contents. The area selection is done according to the municipal division or according to a freely definable selection. The material that is delivered as files comes in map sheets where the objects are in their entirety. The files are updated with changes weekly and there is also an update service available for them.

The Cadastral index map is available also in the land information inquiry service (WFS), more information (in Finnish) http://www.maanmittauslaitos.fi/kiinteistot/asiantuntevalle-kayttajalle/kiinteistotietojen-rajapintapalvelut/kiinteistotietojen. The service offers real-time information and also information about right-of-use units with locations.

The Cadastral index map raster is available also in the map image service (WMS), more information (in Finnish) http://www.maanmittauslaitos.fi/kartat-ja-paikkatieto/asiantuntevalle-kayttajalle/kartta-ja-paikkatietojen-rajapintapalvelut-1 and the map image service (WMTS), more information (in Finnish) http://www.maanmittauslaitos.fi/kartat-ja-paikkatieto/asiantuntevalle-kayttajalle/kartta-ja-paikkatietojen-rajapintapalvelut-1

Copyright and other immaterial rights to the Cadastral index map are owned by the National Land Survey and the municipalities. The data material is not confidential. Public access to the material is not restricted by the INSPIRE Directive.