EPSG systems

EPSG:4817 NGO 1948 (Oslo)

Geographic system in latitude and longitude, in use: Norway - onshore. Datum, ellipsoid and transformation to WGS 84 below.

EPSG publishes no simple transformation to WGS 84 for this datum: conversion works on the ellipsoid alone and can be off by tens of metres.

Convert coordinates Open in Carte Download the .prj

System record
Code	EPSG:4817
Name	NGO 1948 (Oslo)
Type	Geographic system
Area of use	Norway - onshore
Bounds	W 4,39° · S 57,90° · E 31,32° · N 71,24°
Countries	Norway
Datum	NGO 1948 (Oslo)
Ellipsoid	Bessel Modified a = 6377492.018 m · 1/f = 299.1528128
Prime meridian	Oslo 10.722916666666666 degree
Unit	degree (Lat north, Lon east)
Transformation to WGS 84	No simple transformation published (ellipsoid alone)
Scope	Geodesy.

proj4 definition

+proj=longlat +a=6377492.018 +rf=299.1528128 +pm=oslo +no_defs

Paste it into QGIS, proj4js, PostGIS (spatial_ref_sys) or GDAL. +towgs84 carries the EPSG transformation to WGS 84; the official code stays EPSG:4817.

WKT (ESRI format, the .prj content)

GEOGCS["GCS_NGO_1948_Oslo",DATUM["NGO_1948_(Oslo)",SPHEROID["Bessel_Modified",6377492.018,299.1528128]],PRIMEM["Oslo",10.7229166666667],UNIT["Degree",0.0174532925199433]]

All systems — Norway

Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.

proj4 definition

WKT (ESRI format, the .prj content)

Other systems — Norway