Voirol 1875 (Paris)

Algeria - onshore north of 32°N. code 1266 (default)

Selected transformation

Method: Longitude rotation

Remarks:

Information source: OGP

Revision date: 2010-03-30

Attributes

Unit: grad

Geodetic CRS: Voirol 1875 (Paris)

Datum: Voirol 1875 (Paris)

Ellipsoid: Clarke 1880 (IGN)

Prime meridian: Paris

Data source: EPSG

Information source: IGN Paris

Revision date: 2004-01-06

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.

Covered area powered by MapTiler

Center coordinates
0.82 38.41

WGS84 bounds:
-2.95 31.99
9.09 37.14

Algeria - onshore north of 32°N.

Definition: OGC Well Known Text 2 (2019)

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BOUNDCRS[
    SOURCECRS[
        GEOGCRS["Voirol 1875 (Paris)",
            DATUM["Voirol 1875 (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",4811]]],
    TARGETCRS[
        GEOGCRS["Voirol 1875",
            DATUM["Voirol 1875",
                ELLIPSOID["Clarke 1880 (IGN)",6378249.2,293.466021293627,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[ellipsoidal,2],
                AXIS["geodetic latitude (Lat)",north,
                    ORDER[1],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["geodetic longitude (Lon)",east,
                    ORDER[2],
                    ANGLEUNIT["degree",0.0174532925199433]],
            USAGE[
                SCOPE["Geodesy."],
                AREA["Algeria - onshore north of 32°N."],
                BBOX[31.99,-2.95,37.14,9.09]],
            ID["EPSG",4304]]],
    ABRIDGEDTRANSFORMATION["Voirol 1875 (Paris) to Voirol 1875 (1)",
        METHOD["Longitude rotation",
            ID["EPSG",9601]],
        PARAMETER["Longitude offset",8414.02501199997,
            ID["EPSG",8602]],
        USAGE[
            SCOPE["Change of prime meridian."],
            AREA["Algeria - onshore north of 32°N."],
            BBOX[31.99,-2.95,37.14,9.09]],
        ID["EPSG",1266]]]

Definition: PROJ.4

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

Definition: JavaScript (Proj4js)

proj4.defs("EPSG:4811","+proj=longlat +ellps=clrk80ign +pm=paris +no_defs +type=crs");

Definition: JSON

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{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "BoundCRS",
    "source_crs": {
        "type": "GeographicCRS",
        "name": "Voirol 1875 (Paris)",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Voirol 1875 (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
                    }
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 4811
        }
    },
    "target_crs": {
        "type": "GeographicCRS",
        "name": "Voirol 1875",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Voirol 1875",
            "ellipsoid": {
                "name": "Clarke 1880 (IGN)",
                "semi_major_axis": 6378249.2,
                "semi_minor_axis": 6356515
            }
        },
        "coordinate_system": {
            "subtype": "ellipsoidal",
            "axis": [
                {
                    "name": "Geodetic latitude",
                    "abbreviation": "Lat",
                    "direction": "north",
                    "unit": "degree"
                },
                {
                    "name": "Geodetic longitude",
                    "abbreviation": "Lon",
                    "direction": "east",
                    "unit": "degree"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 4304
        }
    },
    "transformation": {
        "name": "Voirol 1875 (Paris) to Voirol 1875 (1)",
        "method": {
            "name": "Longitude rotation",
            "id": {
                "authority": "EPSG",
                "code": 9601
            }
        },
        "parameters": [
            {
                "name": "Longitude offset",
                "value": 2.5969213,
                "unit": {
                    "type": "AngularUnit",
                    "name": "grad",
                    "conversion_factor": 0.0157079632679489
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8602
                }
            }
        ],
        "id": {
            "authority": "EPSG",
            "code": 1266
        }
    }
}

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>

EPSG:4811