EPSG:27581 DEPRECATED

NTF (Paris) / France I

Available transformations
to EPSG:4171
EPSG:4171 - RGF93 v1

Selected transformation

Remarks: See transformation code 7811 for an alternative which uses the NTv2 method as an emulation of the geocentric interpolation in the second step.

Information source: IOGP

Revision date: 2016-05-01

Attributes

Unit: metre

Geodetic CRS: NTF (Paris)

Datum: Nouvelle Triangulation Francaise (Paris)

Ellipsoid: Clarke 1880 (IGN)

Prime meridian: Paris

Data source: EPSG

Revision date: 1996-04-12

Scope: Engineering survey, topographic mapping.

Remarks: Introduced 1972. Supersedes NTF / Nord France (code 27591).

Area of use: France mainland onshore north of 53.5 grads North (48°09'N).

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

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SimpleMap

Center coordinates
603357.78 835717.15

Projected bounds:
-8364.58 286896.0
1215670.12 1407125.32

WGS84 bounds:
-4.87 41.31
9.63 51.14

France - onshore - mainland and Corsica.
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Definition: OGC Well Known Text

PROJCS["NTF (Paris) / France I (deprecated)",
    GEOGCS["NTF (Paris)",
        DATUM["Nouvelle_Triangulation_Francaise_Paris",
            SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627,
                AUTHORITY["EPSG","7011"]],
            AUTHORITY["EPSG","6807"]],
        PRIMEM["Paris",2.33722917,
            AUTHORITY["EPSG","8903"]],
        UNIT["grad",0.0157079632679489,
            AUTHORITY["EPSG","9105"]],
        AUTHORITY["EPSG","4807"]],
    PROJECTION["Lambert_Conformal_Conic_1SP"],
    PARAMETER["latitude_of_origin",55],
    PARAMETER["central_meridian",0],
    PARAMETER["scale_factor",0.999877341],
    PARAMETER["false_easting",600000],
    PARAMETER["false_northing",1200000],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","27581"]]

Definition: OGC Well Known Text 2 (2019)

PROJCRS["NTF (Paris) / France I",
    BASEGEOGCRS["NTF (Paris)",
        DATUM["Nouvelle Triangulation Francaise (Paris)",
            ELLIPSOID["Clarke 1880 (IGN)",6378249.2,293.466021293627,
                LENGTHUNIT["metre",1]]],
        PRIMEM["Paris",2.5969213,
            ANGLEUNIT["grad",0.0157079632679489]],
        ID["EPSG",4807]],
    CONVERSION["Lambert zone I",
        METHOD["Lambert Conic Conformal (1SP)",
            ID["EPSG",9801]],
        PARAMETER["Latitude of natural origin",55,
            ANGLEUNIT["grad",0.0157079632679489],
            ID["EPSG",8801]],
        PARAMETER["Longitude of natural origin",0,
            ANGLEUNIT["grad",0.0157079632679489],
            ID["EPSG",8802]],
        PARAMETER["Scale factor at natural origin",0.999877341,
            SCALEUNIT["unity",1],
            ID["EPSG",8805]],
        PARAMETER["False easting",600000,
            LENGTHUNIT["metre",1],
            ID["EPSG",8806]],
        PARAMETER["False northing",1200000,
            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["France mainland onshore north of 53.5 grads North (48°09'N)."],
        BBOX[48.14,-4.87,51.14,8.23]],
    ID["EPSG",27581]]

Definition: ESRI Well Known Text

PROJCS["NTF_Paris_France_I",
    GEOGCS["GCS_NTF_Paris",
        DATUM["Nouvelle_Triangulation_Francaise_(Paris)",
            SPHEROID["Clarke_1880_IGN",6378249.2,293.466021293627]],
        PRIMEM["Paris",2.33722917],
        UNIT["Grad",0.0157079632679489]],
    PROJECTION["Lambert_Conformal_Conic"],
    PARAMETER["False_Easting",600000.0],
    PARAMETER["False_Northing",1200000.0],
    PARAMETER["Central_Meridian",0.0],
    PARAMETER["Standard_Parallel_1",55.0],
    PARAMETER["Scale_Factor",0.999877341],
    PARAMETER["Latitude_Of_Origin",55.0],
    UNIT["Meter",1.0]]

Definition: PROJ.4

+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=0 +k_0=0.999877341 +x_0=600000 +y_0=1200000 +ellps=clrk80ign +pm=paris +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:27581","+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=0 +k_0=0.999877341 +x_0=600000 +y_0=1200000 +ellps=clrk80ign +pm=paris +units=m +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "ProjectedCRS",
    "name": "NTF (Paris) / France I",
    "base_crs": {
        "name": "NTF (Paris)",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Nouvelle Triangulation Francaise (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": 4807
        }
    },
    "conversion": {
        "name": "Lambert zone I",
        "method": {
            "name": "Lambert Conic Conformal (1SP)",
            "id": {
                "authority": "EPSG",
                "code": 9801
            }
        },
        "parameters": [
            {
                "name": "Latitude of natural origin",
                "value": 55,
                "unit": {
                    "type": "AngularUnit",
                    "name": "grad",
                    "conversion_factor": 0.0157079632679489
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8801
                }
            },
            {
                "name": "Longitude of natural origin",
                "value": 0,
                "unit": {
                    "type": "AngularUnit",
                    "name": "grad",
                    "conversion_factor": 0.0157079632679489
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8802
                }
            },
            {
                "name": "Scale factor at natural origin",
                "value": 0.999877341,
                "unit": "unity",
                "id": {
                    "authority": "EPSG",
                    "code": 8805
                }
            },
            {
                "name": "False easting",
                "value": 600000,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8806
                }
            },
            {
                "name": "False northing",
                "value": 1200000,
                "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": "France mainland onshore north of 53.5 grads North (48°09'N).",
    "bbox": {
        "south_latitude": 48.14,
        "west_longitude": -4.87,
        "north_latitude": 51.14,
        "east_longitude": 8.23
    },
    "id": {
        "authority": "EPSG",
        "code": 27581
    }
}

Definition: GeoServer

27581=PROJCS["NTF (Paris) / France I (deprecated)",GEOGCS["NTF (Paris)",DATUM["Nouvelle_Triangulation_Francaise_Paris",SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627,AUTHORITY["EPSG","7011"]],AUTHORITY["EPSG","6807"]],PRIMEM["Paris",2.33722917,AUTHORITY["EPSG","8903"]],UNIT["grad",0.0157079632679489,AUTHORITY["EPSG","9105"]],AUTHORITY["EPSG","4807"]],PROJECTION["Lambert_Conformal_Conic_1SP"],PARAMETER["latitude_of_origin",55],PARAMETER["central_meridian",0],PARAMETER["scale_factor",0.999877341],PARAMETER["false_easting",600000],PARAMETER["false_northing",1200000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27581"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=lcc"
	"lat_1=49.5"
	"lat_0=49.5"
	"lon_0=0"
	"k_0=0.999877341"
	"x_0=600000"
	"y_0=1200000"
	"ellps=clrk80ign"
	"pm=paris"
	"units=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=0 +k_0=0.999877341 +x_0=600000 +y_0=1200000 +ellps=clrk80ign +pm=paris +units=m +no_defs +type=crs">
	<Layer srs="+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=0 +k_0=0.999877341 +x_0=600000 +y_0=1200000 +ellps=clrk80ign +pm=paris +units=m +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 27581, 'EPSG', 27581, '+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=0 +k_0=0.999877341 +x_0=600000 +y_0=1200000 +ellps=clrk80ign +pm=paris +units=m +no_defs +type=crs', 'PROJCS["NTF (Paris) / France I (deprecated)",GEOGCS["NTF (Paris)",DATUM["Nouvelle_Triangulation_Francaise_Paris",SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627,AUTHORITY["EPSG","7011"]],AUTHORITY["EPSG","6807"]],PRIMEM["Paris",2.33722917,AUTHORITY["EPSG","8903"]],UNIT["grad",0.0157079632679489,AUTHORITY["EPSG","9105"]],AUTHORITY["EPSG","4807"]],PROJECTION["Lambert_Conformal_Conic_1SP"],PARAMETER["latitude_of_origin",55],PARAMETER["central_meridian",0],PARAMETER["scale_factor",0.999877341],PARAMETER["false_easting",600000],PARAMETER["false_northing",1200000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27581"]]');