EPSG:4671 Voirol 1879
Geographic system in latitude and longitude, in use: Algeria - north of 32°N. 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.
| Code | EPSG:4671 |
|---|---|
| Name | Voirol 1879 |
| Type | Geographic system |
| Area of use |
Algeria - north of 32°N Algeria - onshore north of 32°N. |
| Bounds | W -2,95° · S 31,99° · E 9,09° · N 37,14° |
| Countries | Algeria |
| Datum | Voirol 1879 |
| Ellipsoid | Clarke 1880 (IGN) a = 6378249.2 m · 1/f = 293.466021294 |
| Unit | degree (Lat north, Lon east) |
| Transformation to WGS 84 | No simple transformation published (ellipsoid alone) |
| Scope | Geodesy. |
proj4 definition
+proj=longlat +ellps=clrk80ign +no_defsPaste it into QGIS, proj4js, PostGIS (spatial_ref_sys) or GDAL. +towgs84 carries the EPSG transformation to WGS 84; the official code stays EPSG:4671.
WKT (ESRI format, the .prj content)
GEOGCS["GCS_Voirol_1879",DATUM["D_Voirol_1879",SPHEROID["Clarke_1880_IGN",6378249.2,293.466021293627]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]Other systems — Algeria
- EPSG:4304Voirol 1875
- EPSG:4307Nord Sahara 1959
- EPSG:4811Voirol 1875 (Paris)
- EPSG:4821Voirol 1879 (Paris)
- EPSG:10299RGSH2020
- EPSG:22229RGSH2020 / UTM zone 29N
- EPSG:22230RGSH2020 / UTM zone 30N
- EPSG:22231RGSH2020 / UTM zone 31N
- EPSG:22232RGSH2020 / UTM zone 32N
- EPSG:30491Voirol 1875 / Nord Algerie (ancienne)
- EPSG:30492Voirol 1875 / Sud Algerie (ancienne)
- EPSG:30493Voirol 1879 / Nord Algerie (ancienne)
- EPSG:30494Voirol 1879 / Sud Algerie (ancienne)
- EPSG:30729Nord Sahara 1959 / UTM zone 29N
- EPSG:30730Nord Sahara 1959 / UTM zone 30N
- EPSG:30731Nord Sahara 1959 / UTM zone 31N
- EPSG:30732Nord Sahara 1959 / UTM zone 32N
- EPSG:30791Nord Sahara 1959 / Nord Algerie
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.