Elevation model 2 m
Elevation model 2 m is a model depicting the elevation of the ground surface in relation to sea level. Its grid size is 2 m x 2 m. The dataset is based on laser scanning data, the point density of which is at least 0.5 points per square metre. The product is available as versions with different coverage areas through-out the whole country but not as comprehensive. New data is added to the dataset continuously. Eleva-tion model 10 m is available as a version that covers the whole of Finland.
Elevation model 2 m is produced in two quality classes: the elevation accuracy in class I is on average 0.3 metres and the elevation accuracy in class II varies between 0.3 metres and one metre.
The product belongs to the open data of the National Land Survey of Finland. 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 elevation model allows for example simulation of areas with a high risk of flooding or that of receiving, coverage and service areas. The model can also be used for mass calculation of excavated material and land-fill and for calculating inclinations, steepness or profiles. Application areas are found, for example in geol-ogy, geography and forestry.
National Land Survey of Finland
The product is maintained if needed, but the area of coverage is expanded continuously. An up-to-date map of the area of coverage (in Finnish): http://www.maanmittauslaitos.fi/kartat-ja-paikkatieto/asiantuntevalle-kayttajalle/maastotiedot-ja-niiden-hankinta/maastotiedon
Elevation model 2 m depicts the height of the terrain above sea level. The height values are in accordance with the system N2000.
Elevation model 2 m is the most accurate elevation model of Finland which covers extensive areas. Approximately 40,000 square kilometres are added into the model every year.
Elevation model 2 m is derived from laser scanning data, with a minimum point density of 0.5 per square metres. The dataset is produced in two quality classes:
The elevation model in class I is automatically calculated from the laser scanning data collected in the spring, but controlling and improving the calculation is done by using aerial photographs. Further control of the data is manual work.
The elevation model in class II is automatically calculated from the laser scanning data collected in the summer, and no manual control is performed. This way the elevation model data is produced faster.
The elevation model in class II will later be replaced by data from class I.
The accuracy of elevation data in quality class I is on average 0.3 metres. The elevation data is expressed in metres. When it comes to elevation and position accuracy, the product may contain parts that have been updated with such data that is not as accurate as laser scanning data.
The accuracy of the elevation model in class II varies between 0.3 metres and one metre because of the elevation-increasing effect of vegetation that varies locally.
More information in the quality model for Elevation model 2 m (in Finnish): http://www.maanmittauslaitos.fi/sites/maanmittauslaitos.fi/files/attachments/2017/05/KMTK_korkeusmallit_laatukasikirja_2017-01-02.pdf
Index for the coverage of quality classes I and II (in Finnish): http://www.maanmittauslaitos.fi/kartat-ja-paikkatieto/asiantuntevalle-kayttajalle/maastotiedot-ja-niiden-hankinta/maastotiedon
Distribution and further information
National Land Survey of Finland email@example.com
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.
Elevation model 2 m is available as a version that covers the whole country although it is not comprehensive (the product has only been completed regarding some parts of the country). It can also be acquired as versions that cover a particular area. The area definition is done according to TM35FIN map sheet division (6 x 6 km).
Copyright and other immaterial rights on the dataset Elevation model 2 m are owned by the National Land Survey of Finland. The data material is not confidential. Public access to the material is not restricted by the INSPIRE Directive.
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