Geodetic CRS: ETRF2014
Datum: European Terrestrial Reference Frame 2014
Ellipsoid: GRS 1980
Prime meridian: Greenwich
Data source: EPSG
Information source: Häkli et al., "NKG2020 transformation: An updated transformation between dynamic and static reference frames in the Nordic and Baltic countries"; Journal of Geodetic Science 2023; 13: 20220155, https://doi.org/10.1515/jogs-2022-0155.
Revision date: 2025-08-29
Scope: Change of coordinate epoch in 3-dimensions (φλh).
Remarks: Replaces NKG_RF03vel model. Accuracy estimated as 0.1, 0.1, and 0.4 mm/year for the North, East, and Up components, respectively. Because the difference in coordinates that results from application of the model is small (under a decimetre), although the interpolation CRS is given as ETRF2014 any realization of ETRS89 (including NKG_ETRF14) may be used as the interpolation CRS.
Method: Point motion (geocen domain) using NEU velocity grid (Gravsoft)
Description: (0,)
Definition: OGC Well Known Text 2 (2019)
POINTMOTIONOPERATION["NKG land uplift (deformation) model NKG_RF17vel", VERSION["NKG_RF17vel"], SOURCECRS[ GEOGCRS["ETRF2014", DYNAMIC[ FRAMEEPOCH[1989]], DATUM["European Terrestrial Reference Frame 2014", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], CS[ellipsoidal,3], AXIS["geodetic latitude (Lat)",north, ORDER[1], ANGLEUNIT["degree",0.0174532925199433]], AXIS["geodetic longitude (Lon)",east, ORDER[2], ANGLEUNIT["degree",0.0174532925199433]], AXIS["ellipsoidal height (h)",up, ORDER[3], LENGTHUNIT["metre",1]], ID["EPSG",8403]]], METHOD["Point motion (geocen domain) using NEU velocity grid (Gravsoft)", ID["EPSG",1139]], PARAMETERFILE["Point motion velocity north grid file","NKG_RF17vel_N.GRI"], OPERATIONACCURACY[0.001], USAGE[ SCOPE["Change of coordinate epoch in 3-dimensions (φλh)."], AREA["Denmark, Estonia, Finland, Latvia, Lithuania, and Sweden - onshore and offshore; Norway - onshore, nearshore, and offshore southeast of a line joining Haugesund and the western limit of the Norway-Denmark maritime boundary."], BBOX[53.89,3.24,71.39,31.77]], ID["EPSG",10808], REMARK["Replaces NKG_RF03vel model. Accuracy estimated as 0.1, 0.1, and 0.4 mm/year for the North, East, and Up components, respectively. Because the difference in coordinates that results from application of the model is small (under a decimetre), although the interpolation CRS is given as ETRF2014 any realization of ETRS89 (including NKG_ETRF14) may be used as the interpolation CRS."]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "PointMotionOperation", "name": "NKG land uplift (deformation) model NKG_RF17vel", "source_crs": { "type": "GeographicCRS", "name": "ETRF2014", "datum": { "type": "DynamicGeodeticReferenceFrame", "name": "European Terrestrial Reference Frame 2014", "frame_reference_epoch": 1989, "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 } }, "coordinate_system": { "subtype": "ellipsoidal", "axis": [ { "name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree" }, { "name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree" }, { "name": "Ellipsoidal height", "abbreviation": "h", "direction": "up", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 8403 } }, "method": { "name": "Point motion (geocen domain) using NEU velocity grid (Gravsoft)", "id": { "authority": "EPSG", "code": 1139 } }, "parameters": [ { "name": "Point motion velocity north grid file", "value": "NKG_RF17vel_N.GRI", "id": { "authority": "EPSG", "code": 1072 } } ], "accuracy": "0.001", "scope": "Change of coordinate epoch in 3-dimensions (φλh).", "area": "Denmark, Estonia, Finland, Latvia, Lithuania, and Sweden - onshore and offshore; Norway - onshore, nearshore, and offshore southeast of a line joining Haugesund and the western limit of the Norway-Denmark maritime boundary.", "bbox": { "south_latitude": 53.89, "west_longitude": 3.24, "north_latitude": 71.39, "east_longitude": 31.77 }, "id": { "authority": "EPSG", "code": 10808 }, "remarks": "Replaces NKG_RF03vel model. Accuracy estimated as 0.1, 0.1, and 0.4 mm/year for the North, East, and Up components, respectively. Because the difference in coordinates that results from application of the model is small (under a decimetre), although the interpolation CRS is given as ETRF2014 any realization of ETRS89 (including NKG_ETRF14) may be used as the interpolation CRS." }