Voirol 1875 / Nord Algerie (ancienne)

Algeria - onshore north of 32°N. , accuracy 999.0 m, code 1294 (default) [3]

Selected transformation

Method: Geocentric translations (geog2D domain)

Remarks: Accuracy estimate not available.

Information source: U.S. Defense Mapping Agency TR8350.2 revision of August 1993.

Revision date: 2020-03-14

Attributes

Unit: metre

Geodetic CRS: Voirol 1875

Datum: Voirol 1875

Ellipsoid: Clarke 1880 (IGN)

Prime meridian: Greenwich

Data source: EPSG

Revision date: 1995-06-02

Scope: Engineering survey, topographic mapping.

Remarks: Replaced by Nord Sahara 1959 / Voirol Unifie Nord (code 30791). 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.

Area of use: Algeria - onshore north of 38.5 grads North (34°39'N).

Coordinate system: Cartesian 2D CS. Axes: easting, northing (X,Y). Orientations: east, north. UoM: m.

Covered area powered by MapTiler

Center coordinates
534195.71 140997.66

Projected bounds:
-34488.93 -144879.84
1104915.7 445164.6

WGS84 bounds:
-2.95 31.99
9.09 37.14

Algeria - onshore north of 32°N.

Definition: OGC Well Known Text

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PROJCS["Voirol 1875 / Nord Algerie (ancienne)",
    GEOGCS["Voirol 1875",
        DATUM["Voirol_1875",
            SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627],
            TOWGS84[-73,-247,227,0,0,0,0]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4304"]],
    PROJECTION["Lambert_Conformal_Conic_1SP"],
    PARAMETER["latitude_of_origin",36],
    PARAMETER["central_meridian",2.7],
    PARAMETER["scale_factor",0.999625544],
    PARAMETER["false_easting",500000],
    PARAMETER["false_northing",300000],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","30491"]]

Definition: OGC Well Known Text 2 (2019)

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PROJCRS["Voirol 1875 / Nord Algerie (ancienne)",
    BASEGEOGCRS["Voirol 1875",
        DATUM["Voirol 1875",
            ELLIPSOID["Clarke 1880 (IGN)",6378249.2,293.466021293627,
                LENGTHUNIT["metre",1]]],
        PRIMEM["Greenwich",0,
            ANGLEUNIT["degree",0.0174532925199433]],
        ID["EPSG",4304]],
    CONVERSION["Nord Algerie (ancienne)",
        METHOD["Lambert Conic Conformal (1SP)",
            ID["EPSG",9801]],
        PARAMETER["Latitude of natural origin",40,
            ANGLEUNIT["grad",0.0157079632679489],
            ID["EPSG",8801]],
        PARAMETER["Longitude of natural origin",3,
            ANGLEUNIT["grad",0.0157079632679489],
            ID["EPSG",8802]],
        PARAMETER["Scale factor at natural origin",0.999625544,
            SCALEUNIT["unity",1],
            ID["EPSG",8805]],
        PARAMETER["False easting",500000,
            LENGTHUNIT["metre",1],
            ID["EPSG",8806]],
        PARAMETER["False northing",300000,
            LENGTHUNIT["metre",1],
            ID["EPSG",8807]]],
    CS[Cartesian,2],
        AXIS["easting (X)",east,
            ORDER[1],
            LENGTHUNIT["metre",1]],
        AXIS["northing (Y)",north,
            ORDER[2],
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Engineering survey, topographic mapping."],
        AREA["Algeria - onshore north of 38.5 grads North (34°39'N)."],
        BBOX[34.64,-2.22,37.14,8.64]],
    ID["EPSG",30491]]

Definition: ESRI Well Known Text

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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]]

Definition: PROJ.4

+proj=lcc +lat_1=36 +lat_0=36 +lon_0=2.7 +k_0=0.999625544 +x_0=500000 +y_0=300000 +ellps=clrk80ign +towgs84=-73,-247,227,0,0,0,0 +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js)

proj4.defs("EPSG:30491","+proj=lcc +lat_1=36 +lat_0=36 +lon_0=2.7 +k_0=0.999625544 +x_0=500000 +y_0=300000 +ellps=clrk80ign +towgs84=-73,-247,227,0,0,0,0 +units=m +no_defs +type=crs");

Definition: JSON

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{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "ProjectedCRS",
    "name": "Voirol 1875 / Nord Algerie (ancienne)",
    "base_crs": {
        "name": "Voirol 1875",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Voirol 1875",
            "ellipsoid": {
                "name": "Clarke 1880 (IGN)",
                "semi_major_axis": 6378249.2,
                "inverse_flattening": 293.466021293627
            }
        },
        "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
        }
    },
    "conversion": {
        "name": "Nord Algerie (ancienne)",
        "method": {
            "name": "Lambert Conic Conformal (1SP)",
            "id": {
                "authority": "EPSG",
                "code": 9801
            }
        },
        "parameters": [
            {
                "name": "Latitude of natural origin",
                "value": 40,
                "unit": {
                    "type": "AngularUnit",
                    "name": "grad",
                    "conversion_factor": 0.0157079632679489
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8801
                }
            },
            {
                "name": "Longitude of natural origin",
                "value": 3,
                "unit": {
                    "type": "AngularUnit",
                    "name": "grad",
                    "conversion_factor": 0.0157079632679489
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8802
                }
            },
            {
                "name": "Scale factor at natural origin",
                "value": 0.999625544,
                "unit": "unity",
                "id": {
                    "authority": "EPSG",
                    "code": 8805
                }
            },
            {
                "name": "False easting",
                "value": 500000,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8806
                }
            },
            {
                "name": "False northing",
                "value": 300000,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8807
                }
            }
        ]
    },
    "coordinate_system": {
        "subtype": "Cartesian",
        "axis": [
            {
                "name": "Easting",
                "abbreviation": "X",
                "direction": "east",
                "unit": "metre"
            },
            {
                "name": "Northing",
                "abbreviation": "Y",
                "direction": "north",
                "unit": "metre"
            }
        ]
    },
    "scope": "Engineering survey, topographic mapping.",
    "area": "Algeria - onshore north of 38.5 grads North (34°39'N).",
    "bbox": {
        "south_latitude": 34.64,
        "west_longitude": -2.22,
        "north_latitude": 37.14,
        "east_longitude": 8.64
    },
    "id": {
        "authority": "EPSG",
        "code": 30491
    }
}

Definition: GeoServer

30491=PROJCS["Voirol 1875 / Nord Algerie (ancienne)",GEOGCS["Voirol 1875",DATUM["Voirol_1875",SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627],TOWGS84[-73,-247,227,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4304"]],PROJECTION["Lambert_Conformal_Conic_1SP"],PARAMETER["latitude_of_origin",36],PARAMETER["central_meridian",2.7],PARAMETER["scale_factor",0.999625544],PARAMETER["false_easting",500000],PARAMETER["false_northing",300000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","30491"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=lcc"
	"lat_1=36"
	"lat_0=36"
	"lon_0=2.7"
	"k_0=0.999625544"
	"x_0=500000"
	"y_0=300000"
	"ellps=clrk80ign"
	"towgs84=-73,-247,227,0,0,0,0"
	"units=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=lcc +lat_1=36 +lat_0=36 +lon_0=2.7 +k_0=0.999625544 +x_0=500000 +y_0=300000 +ellps=clrk80ign +towgs84=-73,-247,227,0,0,0,0 +units=m +no_defs +type=crs">
	<Layer srs="+proj=lcc +lat_1=36 +lat_0=36 +lon_0=2.7 +k_0=0.999625544 +x_0=500000 +y_0=300000 +ellps=clrk80ign +towgs84=-73,-247,227,0,0,0,0 +units=m +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 30491, 'EPSG', 30491, '+proj=lcc +lat_1=36 +lat_0=36 +lon_0=2.7 +k_0=0.999625544 +x_0=500000 +y_0=300000 +ellps=clrk80ign +towgs84=-73,-247,227,0,0,0,0 +units=m +no_defs +type=crs', 'PROJCS["Voirol 1875 / Nord Algerie (ancienne)",GEOGCS["Voirol 1875",DATUM["Voirol_1875",SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627],TOWGS84[-73,-247,227,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4304"]],PROJECTION["Lambert_Conformal_Conic_1SP"],PARAMETER["latitude_of_origin",36],PARAMETER["central_meridian",2.7],PARAMETER["scale_factor",0.999625544],PARAMETER["false_easting",500000],PARAMETER["false_northing",300000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","30491"]]');

EPSG:30491