Convert NGO 1948 to WGS 84

Convert coordinates from NGO 1948 (EPSG:4273) to WGS 84 (EPSG:4326) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

From

Input (lon, lat (decimal degrees))

Output (lon, lat (decimal degrees))

Direct link to this transformation: epsgtransform.com/transform/epsg-4273-to-epsg-4326

Official EPSG transformation from NGO 1948 to WGS 84

The EPSG Geodetic Parameter Dataset defines 1 transformation between NGO 1948 (EPSG:4273) and WGS 84 (EPSG:4326). Its parameters, accuracy and area of use are listed below.

NGO 1948 to WGS 84 (1)

EPSG:1654±3 m

Method:: Position Vector transformation (geog2D domain)
Area of use:: Norway - onshore
Scope:: (null/copy) Approximation for medium and low accuracy applications assuming equality between plate-fixed static and earth-fixed dynamic CRSs, ignoring static/dynamic CRS differences.

Parameter	Value	Unit
X-axis translation(tx)	278.3	metre
Y-axis translation(ty)	93	metre
Z-axis translation(tz)	474.5	metre
X-axis rotation(rx)	7.889	arc-second
Y-axis rotation(ry)	0.05	arc-second
Z-axis rotation(rz)	-6.61	arc-second
Scale difference(ds)	6.21	parts per million

Parameter values from NGO 1948 to ETRS89 (1) (code 1653). Assumes ETRS89 and WGS 84 can be considered the same to within the accuracy of the transformation.

Convert EPSG:4273 to EPSG:4326 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4273", "EPSG:4326", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4273 — NGO 1948

geographic system using latitude and longitude on an ellipsoid · Area of use: Norway - onshore

+proj=longlat +a=6377492.018 +rf=299.1528128 +towgs84=278.3,93,474.5,7.889,0.05,-6.61,6.21 +no_defs +type=crs

More about EPSG:4273 →

Target: EPSG:4326 — WGS 84

geographic system using latitude and longitude on an ellipsoid · Area of use: World (by country)

+proj=longlat +datum=WGS84 +no_defs +type=crs

More about EPSG:4326 →

Frequently asked questions

How accurate is converting NGO 1948 to WGS 84?: The most accurate official EPSG transformation between these systems is accurate to about ±3 m within its stated area of use. Browser-based converters approximate datum shifts with Helmert parameters; for surveying-grade work apply the official transformation in a desktop GIS.
Does my data leave the browser when I use this converter?: No. All coordinate transformations are computed locally in your browser using proj4js. The coordinates you enter are never transmitted to any server.

Need the reverse? Convert EPSG:4326 to EPSG:4273 →