Source: EPSG:4978 — WGS 84
geocentric Cartesian system (Earth-centred Earth-fixed) · Area of use: World
+proj=geocent +datum=WGS84 +units=m +no_defs +type=crsMore about EPSG:4978 →
Convert EPSG:4978 to EPSG:27391
Online coordinate converter from WGS 84 (EPSG:4978) to NGO 1948 (Oslo) / NGO zone I (EPSG:27391). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
Convert EPSG:4978 to EPSG:27391 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4978", "EPSG:27391", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:27391 — NGO 1948 (Oslo) / NGO zone I
projected system measured in linear units (typically metres) · Area of use: Norway - zone I
+proj=tmerc +lat_0=58 +lon_0=-4.66666666666667 +k=1 +x_0=0 +y_0=0 +a=6377492.018 +rf=299.1528128 +pm=oslo +towgs84=278.3,93,474.5,7.889,0.05,-6.61,6.21 +units=m +no_defs +type=crsMore about EPSG:27391 →
Frequently asked questions
- How accurate is converting WGS 84 to NGO 1948 (Oslo) / NGO zone I?
- Projection-only conversions are accurate to floating-point precision. If a datum shift is involved, browser-based tools use Helmert parameters which are accurate to roughly 1-5 m; for surveying-grade work apply the official grid-shift 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.