EPSG:CODE

EPSG:4811 — Voirol 1875 (Paris)

Geographic 2D · Algeria - north of 32°N

Export Formats

WKT2
GEOGCRS[
    "Voirol 1875 (Paris)",
    DATUM[
        "Voirol 1875 (Paris)",
        ELLIPSOID[
            "Clarke 1880 (IGN)",
            6378249.2,
            293.466021293627,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",7011]
        ],
        ID["EPSG",6811]
    ],
    PRIMEM[
        "Paris",
        0.040792344,
        ANGLEUNIT["radian",1,ID["EPSG",9101]],
        ID["EPSG",8903]
    ],
    CS[ellipsoidal,2,ID["EPSG",6403]],
    AXIS["Geodetic latitude (Lat)",north],
    AXIS["Geodetic longitude (Lon)",east],
    ANGLEUNIT["grad",0.015707963267949,ID["EPSG",9105]],
    ID["EPSG",4811]
]

Related Coordinate Systems

Available Transformations (2)

Transformation Source → Target Accuracy (m)
Voirol 1875 (Paris) to Voirol 1875 (1)
4811 → 4304 0
Voirol 1875 (Paris) to WGS 84 (1)
4811 → 4326 999

Frequently Asked Questions

How do I add EPSG:4811 to PostGIS?

Add the following definition to your PostGIS configuration: 

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (4811, 'EPSG', 4811, '+proj=longlat +ellps=clrk80ign +pm=paris +no_defs +type=crs', '');
Read the full PostGIS guide →

How do I add EPSG:4811 to MapServer?

Add the following definition to your MapServer configuration: 

PROJECTION
  "+proj=longlat"
  "+ellps=clrk80ign"
  "+pm=paris"
  "+no_defs"
  "+type=crs"
END
Read the full MapServer guide →

How do I use EPSG:4811 with Proj4js?

Add the following definition to your Proj4js configuration: 

proj4.defs("EPSG:4811", "+proj=longlat +ellps=clrk80ign +pm=paris +no_defs +type=crs");
Read the full Proj4js guide →