EPSG:30491 Voirol 1875 / Nord Algerie (ancienne)
Projected system (Lambert Conic Conformal (1SP)) in use: Algeria - north of 34°39'N. The full definition below, and conversion in one click.
| Code | EPSG:30491 |
|---|---|
| Name | Voirol 1875 / Nord Algerie (ancienne) |
| Type | Projected system — Lambert Conic Conformal (1SP) |
| Area of use |
Algeria - north of 34°39'N Algeria - onshore north of 38.5 grads North (34°39'N). |
| Bounds | W -2,22° · S 34,64° · E 8,64° · N 37,14° |
| Countries | Algeria |
| Datum | Voirol 1875 |
| Ellipsoid | Clarke 1880 (IGN) a = 6378249.2 m · 1/f = 293.466021294 |
| Base geographic system | EPSG:4304 — Voirol 1875 |
| Unit | metre (X east, Y north) |
| Transformation to WGS 84 | Voirol 1875 to WGS 84 (1) (EPSG:1294) — accuracy 999 m |
| Scope | Engineering survey, topographic mapping. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 40 | grad |
| Longitude of natural origin | 3 | grad |
| Scale factor at natural origin | 0.999625544 | unity |
| False easting | 500000 | metre |
| False northing | 300000 | metre |
proj4 definition
+proj=lcc +lat_1=36 +lat_0=36 +lon_0=2.7 +k_0=0.999625544 +x_0=500000 +y_0=300000 +ellps=clrk80ign +units=m +towgs84=-73,-247,227 +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:30491.
WKT (ESRI format, the .prj content)
PROJCS["Nord_Algerie_Ancienne",GEOGCS["GCS_Voirol_1875",DATUM["D_Voirol_1875",SPHEROID["Clarke_1880_IGN",6378249.2,293.466021293627]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",300000.0],PARAMETER["Central_Meridian",2.7],PARAMETER["Standard_Parallel_1",36.0],PARAMETER["Scale_Factor",0.999625544],PARAMETER["Latitude_Of_Origin",36.0],UNIT["Meter",1.0]]Other systems — Algeria
- EPSG:4307Nord Sahara 1959
- EPSG:4671Voirol 1879
- 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: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
- EPSG:30792Nord Sahara 1959 / Sud Algerie
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.