EPSG:4821 — Voirol 1879 (Paris)

Geographic 2D · Algeria - north of 32°N

Export Formats

OGC WKT

GEOGCS[
    "Voirol 1879 (Paris)",
    DATUM[
        "Voirol_1879_Paris",
        SPHEROID[
            "Clarke 1880 (IGN)",
            6378249.2,
            293.466021293627,
            AUTHORITY["EPSG","7011"]
        ],
        AUTHORITY["EPSG","6821"]
    ],
    PRIMEM["Paris",2.33722917,AUTHORITY["EPSG","8903"]],
    UNIT["grad",0.0157079632679489,AUTHORITY["EPSG","9105"]],
    AUTHORITY["EPSG","4821"]
]

WKT2

GEOGCRS[
    "Voirol 1879 (Paris)",
    DATUM[
        "Voirol 1879 (Paris)",
        ELLIPSOID[
            "Clarke 1880 (IGN)",
            6378249.2,
            293.466021293627,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",7011]
        ],
        ID["EPSG",6821]
    ],
    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",4821]
]

PROJ.4

+proj=longlat +ellps=clrk80ign +pm=paris +no_defs +type=crs

Proj4js

How to add a projection to Proj4js? →

proj4.defs("EPSG:4821", "+proj=longlat +ellps=clrk80ign +pm=paris +no_defs +type=crs");

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 4821,
  "name": "Voirol 1879 (Paris)",
  "kind": "geographic 2D",
  "area": "Algeria - north of 32°N",
  "unit": "grad",
  "bbox": [
    31.99,
    -2.95,
    37.14,
    9.09
  ],
  "proj4": "+proj=longlat +ellps=clrk80ign +pm=paris +no_defs +type=crs"
}

PostGIS

How to add a projection to PostGIS? →

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (4821, 'EPSG', 4821, '+proj=longlat +ellps=clrk80ign +pm=paris +no_defs +type=crs', 'GEOGCS["Voirol 1879 (Paris)",DATUM["Voirol_1879_Paris",SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627,AUTHORITY["EPSG","7011"]],AUTHORITY["EPSG","6821"]],PRIMEM["Paris",2.33722917,AUTHORITY["EPSG","8903"]],UNIT["grad",0.0157079632679489,AUTHORITY["EPSG","9105"]],AUTHORITY["EPSG","4821"]]');

MapServer

How to add a projection to MapServer? →

PROJECTION
  "+proj=longlat"
  "+ellps=clrk80ign"
  "+pm=paris"
  "+no_defs"
  "+type=crs"
END

GeoServer

How to add a projection to GeoServer? →

4821=GEOGCS["Voirol 1879 (Paris)",DATUM["Voirol_1879_Paris",SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627,AUTHORITY["EPSG","7011"]],AUTHORITY["EPSG","6821"]],PRIMEM["Paris",2.33722917,AUTHORITY["EPSG","8903"]],UNIT["grad",0.0157079632679489,AUTHORITY["EPSG","9105"]],AUTHORITY["EPSG","4821"]]

Frequently Asked Questions

How do I add EPSG:4821 to GeoServer?

Add the following definition to your GeoServer configuration:

4821=GEOGCS["Voirol 1879 (Paris)",DATUM["Voirol_1879_Paris",SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627,AUTHORITY["EPSG","7011"]],AUTHORITY["EPSG","6821"]],PRIMEM["Paris",2.33722917,AUTHORITY["EPSG","8903"]],UNIT["grad",0.0157079632679489,AUTHORITY["EPSG","9105"]],AUTHORITY["EPSG","4821"]]

Read the full GeoServer guide →

How do I add EPSG:4821 to PostGIS?

Add the following definition to your PostGIS configuration:

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (4821, 'EPSG', 4821, '+proj=longlat +ellps=clrk80ign +pm=paris +no_defs +type=crs', 'GEOGCS["Voirol 1879 (Paris)",DATUM["Voirol_1879_Paris",SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627,AUTHORITY["EPSG","7011"]],AUTHORITY["EPSG","6821"]],PRIMEM["Paris",2.33722917,AUTHORITY["EPSG","8903"]],UNIT["grad",0.0157079632679489,AUTHORITY["EPSG","9105"]],AUTHORITY["EPSG","4821"]]');

Read the full PostGIS guide →

How do I add EPSG:4821 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:4821 with Proj4js?

Add the following definition to your Proj4js configuration:

proj4.defs("EPSG:4821", "+proj=longlat +ellps=clrk80ign +pm=paris +no_defs +type=crs");

Read the full Proj4js guide →