Algeria coordinate converter
Free Algeria coordinate converter: Nord Sahara 1959, the Voirol belt and modern RGSH2020 to WGS84 and UTM zone 31 — official EPSG parameters with accuracy badges.
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Coordinate systems in Algeria: quick reference
Algeria has long relied on the Nord Sahara 1959 datum (EPSG:4307), which unified survey, mapping and petroleum work across both the Sahara and the north. This datum inherited the older Voirol-school projections through the Nord Algerie belt (EPSG:30791) that covers the northern strip on a single grid.
Alongside that belt, Nord Sahara 1959 / UTM zone 31N (EPSG:30731) serves work in zone 31, where most of the north lies. The modern frame is RGSH2020, tied to the global frames and supplied as geographic coordinates (EPSG:10299) and through the RGSH2020 / UTM zone 31N projection (EPSG:22231) for precise new work.
Algiers, near longitude 3 degrees east, sits in zone 31N. Enter your coordinates in the converter below, which opens on the capital and lists the Algerian systems first, to get the value in every system that covers your location, each with a clear accuracy badge.
| EPSG | System | Accuracy |
|---|---|---|
| 4307 | Nord Sahara 1959(geographic) | ±0.1 m |
| 30791 | Nord Sahara 1959 / Algeria Nord(projected grid) | ±0.1 m |
| 30731 | Nord Sahara 1959 / UTM zone 31N(projected grid) | ±0.1 m |
| 22231 | RGSH2020 / UTM zone 31N(projected grid) | ±0.1 m |
| 10299 | RGSH2020(geographic) | ±0.1 m |
The tool covers 23 systems relevant to Algeria (national systems plus the WGS84 UTM zones) — the table above lists only the key ones.
FAQ
- Which coordinate system does Algeria use?
- The classic datum is Nord Sahara 1959 (EPSG:4307) with the Nord Algerie belt (EPSG:30791) and UTM zone 31N (EPSG:30731); the modern frame is RGSH2020, geographic (EPSG:10299) and as a UTM zone 31N projection (EPSG:22231). The required one depends on the authority and the project.
- How do the Voirol projections relate to the Algerian grid?
- The northern belts in Algeria inherited their geometry from the older Voirol projections and were later referenced to Nord Sahara 1959 in the Nord Algerie belt (EPSG:30791). The Voirol name still appears in many reference documents.
- Which UTM zone is Algiers in?
- Algiers, near longitude 3 degrees east, sits in zone 31N, the zone that covers most of the north. Eastern regions can extend into zone 32.
- What is RGSH2020?
- A modern national reference frame for Algeria tied to the global frames, adopted for precise geodetic work and available as geographic coordinates (EPSG:10299) and a UTM zone 31N projection (EPSG:22231). It is more accurate than Nord Sahara 1959 for new work.
- Why does GPS disagree with an old Nord Sahara map?
- GPS observes on WGS84 while the map sits on Nord Sahara 1959, and the two differ by several metres. This tool applies the published EPSG datum shift automatically to reconcile the two readings.
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