Coordinate systems for files - land and coast
UTM Euref89 are the standard coordinate systems for distributions in Norway. Various zones are used: zone 33 for nationwide data, while municipalities normally uses zones 32 in Southern Norway, 33 in Nordland and Troms, and 35 in Finnmark.
The files available for land and coast-based data in Geonorge are as follows:
- Nation wide data are in UTM zone 33
Local zones:
- UTM zone 32 - municipalities in Innlandet, Oslo, Viken, Vestfold og Telemark, Agder, Rogaland, Vestland, Møre og Romsdal, Trøndelag.
- UTM zone 33 - municipalities in Nordland and the Troms-part of Troms og Finnmark
- UTM zone 35 - municipalities in the Finnmark-part of Troms og Finnmark.
Marine, environmental and measurement data
Data covering the large sea areas, measurement data linked with meteorology and oceanography, etc. can use the standard UTM variants in many situations, but they often use other coordinate systems as well. Geographical coordinate systems are used or UTM with other zones, e.g. zones 34 and 36.
Polar requirements
Polar regions use a number of special coordinate systems and projections. Special versions can be used which have central projection points further north, e.g. LAEA versions. It is also common to use circumpolar projections, e.g. of Artic SDI. Norwegian agencies supplying data for such use must ensure that they offer such coordinate systems.
The oil industry
The oil industry is still using ED50 and so a certain amount of data is offered in accordance with this.
INSPIRE
INSPIRE (the European Spatial Data Infrastructure) requires data and services to be supplied using different coordinate systems. UTM is accepted. Norwegian offerings therefore meet this requirement. However, INSPIRE also requires other coordinate systems, and agencies supplying data in accordanse with INSPIRE must therefore ensure that they supply data and services with these:
- LAEA - Lambert Azimuthal Equal Area
- LCC - Lambert Conformal Conic
API/Services
Services such as WMS, WFS or WCS can usually supply different coordinate systems. This is documented in the metadata of the services. Information can also be find in the GetCapabilities for the service. For services supplying raster data, transformation may result in a certain amount of slowness if coordinate systems other than the original one are required. This is particularly applicable in the case of datum transformation.
EPSG Codes
Every coordinate system has its own ID in accordance with an international scheme; EPSG codes. It is important to note that there are different EPSG code variants for 2D data and 3D data.