metre
Engineering survey, topographic mapping.
None
Algeria - onshore north of 38.5 grads North (34°39'N).
Data Source: EPSG v11.016 2024-08-31
Datum: Voirol 1875
Coordinate System: cartesian
Projection: Nord Algerie (ancienne)
Geodetic CRS: Voirol 1875
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]]
{
"$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,
"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
}
},
"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
}
}
{'crs_wkt': '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]]',
'false_easting': 500000.0,
'false_northing': 300000.0,
'geographic_crs_name': 'Voirol 1875',
'grid_mapping_name': 'lambert_conformal_conic',
'horizontal_datum_name': 'Voirol 1875',
'inverse_flattening': 293.4660212936269,
'longitude_of_central_meridian': 3.0,
'longitude_of_prime_meridian': 0.0,
'prime_meridian_name': 'Greenwich',
'projected_crs_name': 'Voirol 1875 / Nord Algerie (ancienne)',
'reference_ellipsoid_name': 'Clarke 1880 (IGN)',
'semi_major_axis': 6378249.2,
'semi_minor_axis': 6356515.0,
'standard_parallel': 40.0}