Norwegian Chart Datum


Data source: EPSG

Information source: Norwegian Mapping Authority, Hydrographic Service.

Revision date: 2021-02-05

Scope: Hydrography and nautical charting.

Remarks: Prior to 2000-01-01 the definition of chart datum was Z0 = M2 + S2 + N2 + K2 + K1 + ½Sa plus safety margins (10 cm north of Hordaland, 20 cm in Hordaland, 30 cm from Rogaland to the Swedish border and 40 cm in the inner parts of the Oslofjord).

Area of use: Norway (offshore) and Svalbard and Jan Mayen (offshore).


WGS84 bounds:
38.01 56.08
-13.63 84.73

MapTiler banner

Definition: OGC Well Known Text

VERT_DATUM["Norwegian Chart Datum",2005,

Definition: OGC Well Known Text 2 (2019)

VDATUM["Norwegian Chart Datum",

Definition: ESRI Well Known Text


Definition: JSON

    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "VerticalReferenceFrame",
    "name": "Norwegian Chart Datum",
    "scope": "Hydrography and nautical charting.",
    "area": "Norway (offshore) and Svalbard and Jan Mayen (offshore).",
    "bbox": {
        "south_latitude": 56.08,
        "west_longitude": -13.63,
        "north_latitude": 84.73,
        "east_longitude": 38.01
    "id": {
        "authority": "EPSG",
        "code": 1301

Definition: GeoServer

1301-datum=VERT_DATUM["Norwegian Chart Datum",2005,AUTHORITY["EPSG","1301"]]