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README.md

no_kv_README.txt

The files in this section result from the conversion of datasets originating from Kartverket

Included grids

Norway: NN2000 heights -> ETRS89 ellipsoidal heights

Source: Kartverket
Format: GeoTIFF converted from GTX
License: Creative Commons Attribution 4.0

Transform local height system NN2000 (EPSG:5941) to ETRS89 ellipsoidal heights (EPSG:4937). The horizontal grid coordinates are referenced to ETRS89.

  • no_kv_HREF2018B_NN2000_EUREF89.tif

Norway: NN1954 heights -> ETRS89 ellipsoidal heights

Source: Kartverket
Format: GeoTIFF converted from GTX
License: Creative Commons Attribution 4.0

Transform local height system NN1954 (EPSG:5776) to ETRS89 ellipsoidal heights (EPSG:4937). The horizontal grid coordinates are referenced to ETRS89.

  • no_kv_href2008a.tif

Norway: Geocentric translation correction grid NKG_ETRF14 epoch 2000.0 -> ETRF93 epoch 2000.0

Format: GeoTIFF
License: Creative Commons Attribution 4.0
Source CRS: NKG:ETRF14
Target CRS: EPSG:7922 (ETRF93)

  • no_kv_NKGETRF14_EPSG7922_2000.tif

The correction grid is one of the steps in the transformation from EPSG:7789 to the norwegian EPSG:4936 (Extent EPSG:1352). The grid contains x-, y- and z-shifts between NKG:ETRF14 and EPSG:7922 at epoch 2000.0, which are computed based on 7 parameter Helmert smoothed with Least Squares Collocation. Input to the computation is 189 points in the norwegian CORS network referred in NKG:ETRF14 and EPSG:7922.

Norway: ETRS89 -> NGO1948

Source: Kartverket
Format: JSON converted from text files
License: Creative Commons Attribution 4.0

Horizontal triangulation to transform coordinates from ETRS89 (EPSG:4258) to NGO1948 (EPSG:4273), with longitude/latitude order.

  • no_kv_ETRS89NO_NGO48_TIN.json

Norway: ETRS89 ellipsoidal heights -> CD Norway heights

Format: GeoTIFF converted from BIN
Source: Kartverket
License: Creative Commons Attribution 4.0
Source CRS: EPSG:4937 (ETRS89 ellipsoidal heights)
Target CRS: EPSG:9672 (Chart datum Norway heights)

  • no_kv_CD_above_Ell_ETRS89_v2023b.tif

Norway: ETRS89 ellipsoidal heights -> Svalbard 2006 heights

Format: GeoTIFF converted from GravSoft BIN
License: Creative Commons Attribution 4.0
Source CRS: EPSG:4937 (ETRS89 ellipsoidal heights)
Target CRS: EPSG:20000 (SVD2006 heights)

The grid transforms from ETRS89 ellipsoidal heights to SVD2006 heights (Svalbard heights). The SVD2006 surface (arcgp-2006-sk) is the Arctic Gravity Project 2006 (arcgp-2006) surface adjusted to two benchmarks tied to the Ny-Ålesund tide gauge (arcgp-2006-sk = arcgp-2006 - 0.8986m). The SVD2006 surface is defined by Mean Sea Level (MSL) at Ny-Ålesund.

  • no_kv_arcgp-2006-sk.tif