EPSG:4821

Voirol 1879 (Paris)

Attributes

Unit: grad

Geodetic CRS: Voirol 1879 (Paris)

Datum: Voirol 1879 (Paris)

Ellipsoid: Clarke 1880 (IGN)

Prime meridian: Paris

Data source: EPSG

Information source: IGN Paris

Revision date: 2004-01-07

Scope: Geodesy.

Remarks: The appropriate usage of CRSs using the Voirol 1875 and 1879 datums is lost in antiquity. They differ by about 9 metres. Oil industry references to one could in reality be to either. All replaced by Nord Sahara 1959 (CRS code 4307).

Area of use: Algeria - onshore north of 32°N.

Coordinate system: Ellipsoidal 2D CS. Axes: latitude, longitude. Orientations: north, east. UoM: grads.

Center coordinates
0.81 38.41

WGS84 bounds:
-2.95 31.99
9.09 37.14

Algeria - onshore north of 32°N.
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Definition: OGC Well Known Text

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"]]

Definition: OGC Well Known Text 2 (2019)

GEOGCRS["Voirol 1879 (Paris)",
    DATUM["Voirol 1879 (Paris)",
        ELLIPSOID["Clarke 1880 (IGN)",6378249.2,293.466021293627,
            LENGTHUNIT["metre",1]]],
    PRIMEM["Paris",2.5969213,
        ANGLEUNIT["grad",0.0157079632679489]],
    CS[ellipsoidal,2],
        AXIS["geodetic latitude (Lat)",north,
            ORDER[1],
            ANGLEUNIT["grad",0.0157079632679489]],
        AXIS["geodetic longitude (Lon)",east,
            ORDER[2],
            ANGLEUNIT["grad",0.0157079632679489]],
    USAGE[
        SCOPE["Geodesy."],
        AREA["Algeria - onshore north of 32°N."],
        BBOX[31.99,-2.95,37.14,9.09]],
    ID["EPSG",4821]]

Definition: ESRI Well Known Text

GEOGCS["GCS_Voirol_1879_Paris",
    DATUM["D_Voirol_1879",
        SPHEROID["Clarke_1880_IGN",6378249.2,293.466021293627]],
    PRIMEM["Paris",2.33722917],
    UNIT["Grad",0.0157079632679489]]

Definition: PROJ.4

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

Definition: JavaScript (Proj4js)

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

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.5/projjson.schema.json",
    "type": "GeographicCRS",
    "name": "Voirol 1879 (Paris)",
    "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "Voirol 1879 (Paris)",
        "ellipsoid": {
            "name": "Clarke 1880 (IGN)",
            "semi_major_axis": 6378249.2,
            "semi_minor_axis": 6356515
        },
        "prime_meridian": {
            "name": "Paris",
            "longitude": {
                "value": 2.5969213,
                "unit": {
                    "type": "AngularUnit",
                    "name": "grad",
                    "conversion_factor": 0.0157079632679489
                }
            }
        }
    },
    "coordinate_system": {
        "subtype": "ellipsoidal",
        "axis": [
            {
                "name": "Geodetic latitude",
                "abbreviation": "Lat",
                "direction": "north",
                "unit": {
                    "type": "AngularUnit",
                    "name": "grad",
                    "conversion_factor": 0.0157079632679489
                }
            },
            {
                "name": "Geodetic longitude",
                "abbreviation": "Lon",
                "direction": "east",
                "unit": {
                    "type": "AngularUnit",
                    "name": "grad",
                    "conversion_factor": 0.0157079632679489
                }
            }
        ]
    },
    "scope": "Geodesy.",
    "area": "Algeria - onshore north of 32°N.",
    "bbox": {
        "south_latitude": 31.99,
        "west_longitude": -2.95,
        "north_latitude": 37.14,
        "east_longitude": 9.09
    },
    "id": {
        "authority": "EPSG",
        "code": 4821
    }
}

Definition: 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"]]

Definition: MapServer - MAPfile

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

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +ellps=clrk80ign +pm=paris +no_defs +type=crs">
	<Layer srs="+proj=longlat +ellps=clrk80ign +pm=paris +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (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"]]');