EPSG:30791 — Nord Sahara 1959 / Algeria Nord
Nord Sahara 1959 / Algeria Nord (EPSG:30791) — a Projected (metres) system on the a=6378249.145 datum, used in Algeria. Parameters, proj4, WKT, accuracy ±0.1 m, plus a f…
At a glance
- EPSG
- 30791
- Name
- Nord Sahara 1959 / Algeria Nord
- Kind
- Projected (metres)
- Family
- Lambert Conformal Conic
- Ellipsoid
- a=6378249.145
- Accuracy
- ±0.1 m (vs PROJ)
- Countries
- Algeria
Area of use
| West | -2.22° |
| South | 34.64° |
| East | 8.64° |
| North | 37.14° |
Projection parameters
| Projection | lcc |
| Standard parallel 1 | 36 |
| Latitude of origin | 36 |
| Central meridian | 2.7 |
| Scale factor | 0.999625544 |
| False easting | 500135 |
| False northing | 300090 |
| Semi-major axis | 6378249.145 |
| Inverse flattening | 293.465 |
| Units | m |
| Helmert shift to WGS84 | -267.407,-47.068,446.357,-0.179423,5.577661,-1.27762,1.204866 |
+proj=lcc +lat_1=36 +lat_0=36 +lon_0=2.7 +k_0=0.999625544 +x_0=500135 +y_0=300090 +a=6378249.145 +rf=293.465 +units=m +no_defs +towgs84=-267.407,-47.068,446.357,-0.179423,5.577661,-1.27762,1.204866
PROJCS["Nord Sahara 1959 / Algeria Nord",GEOGCS["GCS_Nord Sahara 1959 / Algeria Nord",DATUM["D_Custom_6378249.145",SPHEROID["Custom_6378249.145",6378249.145,293.465],TOWGS84[-267.407,-47.068,446.357,-0.179423,5.577661,-1.27762,1.204866]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",500135],PARAMETER["False_Northing",300090],PARAMETER["Central_Meridian",2.7],PARAMETER["Standard_Parallel_1",36],PARAMETER["Scale_Factor",0.999625544],PARAMETER["Latitude_Of_Origin",36],UNIT["Meter",1],AUTHORITY["EPSG","30791"]]
Sample conversion
Algeria capital: WGS84 3.05880, 36.75380 → EPSG:30791 532233.581, 383751.883
Values are within ±0.1 m at the test point.
About the Lambert Conformal Conic family
Nord Sahara 1959 / Algeria Nord uses the Lambert Conformal Conic projection — a cone-based, angle-preserving grid well suited to territories that stretch east–west, defined by one or two standard parallels. It is common for national mapping and for oil-and-gas grids across North Africa and Arabia.
Scale is true along the standard parallel(s) and grows away from them; for precise distance work reduce ground distances to grid using the point scale factor. Confirm both standard parallels and the datum before trusting imported coordinates.
Related systems
- EPSG:4206 — Agadez
- EPSG:4304 — Voirol 1875
- EPSG:4307 — Nord Sahara 1959
- EPSG:4671 — Voirol 1879
- EPSG:10299 — RGSH2020
- EPSG:22229 — RGSH2020 / UTM zone 29N
- EPSG:32629 — WGS 84 / UTM zone 29N
- EPSG:32630 — WGS 84 / UTM zone 30N
- EPSG:32631 — WGS 84 / UTM zone 31N
- EPSG:32632 — WGS 84 / UTM zone 32N
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FAQ
- What is EPSG:30791?
- It is the coordinate system “Nord Sahara 1959 / Algeria Nord”, a Projected (metres) system in the Lambert Conformal Conic family, identified worldwide by the code EPSG:30791.
- What datum does it use, and how accurate is it?
- It is based on the a=6378249.145 ellipsoid and it carries Helmert parameters to WGS84. The residual at the test point is about ±0.1 m versus PROJ; for centimetre work use a geodetic adjustment service.
- Where is this system used?
- It is used in Algeria. This page shows its area of use as a coordinate rectangle above.
- How do I convert EPSG:30791 to WGS84?
- Use the free coordinate converter above (preloaded with this system) to convert to WGS84, UTM, or any other system, within a ±0.1 m residual.
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