EPSG Library · North Africa

EPSG:4307 — Nord Sahara 1959

Source: EPSG Dataset via PROJ 9.5.1 · Updated 2026-10-05

Summary

EPSG:4307 (Nord Sahara 1959) is a geographic 2D coordinate reference system on the Nord Sahara 1959 datum with coordinates in degrees. Area of use: Algeria - onshore and offshore.

Type: geographic 2D
Datum: Nord Sahara 1959
Units: degree
Axes: Lat, Lon

Definition

EPSG:4307 as published in the EPSG Dataset (PROJ 9.5.1).
Property	Value
EPSG code	EPSG:4307
Name	Nord Sahara 1959
Type	Geographic 2d CRS
Datum	Nord Sahara 1959
Ellipsoid	Clarke 1880 (RGS) (a = 6,378,249.145 m, 1/f = 293.465)
Prime meridian	Greenwich
Axes	Geodetic latitude (Lat, north, degree); Geodetic longitude (Lon, east, degree)
Scope	Geodesy.
Bounding box	-8.67° to 11.99° longitude, 18.97° to 38.8° latitude

Area of use

Algeria - onshore and offshore.

Example coordinates

A WGS 84 point at longitude 1.66°, latitude 28.885° (inside the area of use) has these coordinates in EPSG:4307:

Computed with PROJ using the EPSG default operation: unavailable until proj_trans is called.
Axis	Value	Unit
Longitude	1.660755	°
Latitude	28.884522	°

Open this conversion in the coordinate converter

Transformations to WGS 84

Candidate operations from the EPSG Dataset, best first as ranked by PROJ.
Operation	Accuracy	Area of use
axis order change (2D) + Nord Sahara 1959 to WGS 84 (11) + axis order change (2D)	1 m	Algeria - onshore and offshore.
axis order change (2D) + Nord Sahara 1959 to WGS 84 (1) + axis order change (2D)	44 m	Algeria - onshore.
axis order change (2D) + Nord Sahara 1959 to WGS 84 (2) + axis order change (2D)	44 m	Algeria - onshore north of 32°N.
axis order change (2D) + Nord Sahara 1959 to WGS 84 (4) + axis order change (2D)	5 m	Algeria - District 3 (In Salah).
axis order change (2D) + Nord Sahara 1959 to WGS 84 (8) + axis order change (2D)	5 m	Algeria - Ahnet licence area.
axis order change (2D) + Nord Sahara 1959 to WGS 84 (7) + axis order change (2D)	5 m	Algeria - Hassi Mouina licence area.
axis order change (2D) + Nord Sahara 1959 to WGS 84 (5) + axis order change (2D)	100 m	Algeria - In Amenas block.
axis order change (2D) + Nord Sahara 1959 to WGS 84 (6) + axis order change (2D)	100 m	Algeria - Hassi Bir Reikaz.

Transformations change the datum, so each has an accuracy and an area of use. Choose the most accurate one that covers your data and record its name. See datum transformations.

Definitions and downloads

PROJ string

+proj=longlat +a=6378249.145 +rf=293.465 +no_defs +type=crs

A PROJ string cannot carry every EPSG detail (axis order, datum ensemble, transformations). Prefer WKT2 or the EPSG code itself.

Proj4js definition used by the converter

+proj=longlat +a=6378249.145 +rf=293.465 +towgs84=-267.407,-47.068,446.357,-0.179423,5.577661,-1.27762,1.204866 +no_defs

Datum shift from Nord Sahara 1959 to WGS 84 (11) (EPSG accuracy 1 m), the best single Helmert operation for this area of use. Where PROJ prefers a grid-based or multi-step operation (see the table above), results can differ by up to that operation's accuracy.

WKT2:2019

GEOGCRS["Nord Sahara 1959", DATUM["Nord Sahara 1959", ELLIPSOID["Clarke 1880 (RGS)",6378249.145,293.465, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], CS[ellipsoidal,2], AXIS["geodetic latitude (Lat)",north, ORDER[1], ANGLEUNIT["degree",0.0174532925199433]], AXIS["geodetic longitude (Lon)",east, ORDER[2], ANGLEUNIT["degree",0.0174532925199433]], USAGE[ SCOPE["Geodesy."], AREA["Algeria - onshore and offshore."], BBOX[18.97,-8.67,38.8,11.99]], ID["EPSG",4307]]

Downloads

4307.prj — ESRI WKT for shapefiles
4307.wkt — OGC WKT2:2019

FAQ

What is EPSG:4307?

EPSG:4307 (Nord Sahara 1959) is a geographic 2D coordinate reference system on the Nord Sahara 1959 datum with coordinates in degrees. Area of use: Algeria - onshore and offshore.

Where can EPSG:4307 be used?

Its area of use is: Algeria - onshore and offshore.

What is the axis order of EPSG:4307?

By the EPSG definition: Geodetic latitude, Geodetic longitude. Many GIS formats such as GeoJSON and KML store longitude first instead.

How accurate is the transformation from EPSG:4307 to WGS 84?

The most accurate EPSG transformation listed here is “axis order change (2D) + Nord Sahara 1959 to WGS 84 (11) + axis order change (2D)”, with a stated accuracy of 1 m for Algeria - onshore and offshore.. Always check the area of use before applying it.

Coordinate systems

Articles

Tools

References

IOGP. EPSG Geodetic Parameter Dataset, epsg.org/crs_4307.
PROJ 9.5.1 / pyproj 3.7.2, used to compute every value on this page.

Cite this page

GeoCAD Bridge. “EPSG:4307 — Nord Sahara 1959.” GeoCAD Bridge EPSG Library, updated 2026-10-05. https://www.geocadbridge.com/epsg/4307/