EPSG:4275

NTF

Transform Get position on a map

Available transformations
to EPSG:9782
EPSG:9782 - RGF93 v2b

  • France - onshore - mainland and Corsica. , accuracy 1.0 m, code 9889 (default) [grid]

Selected transformation

Method: Geocentric translation by Grid Interpolation (IGN)

Grid Files: gr3df97a.txt

Remarks: Parameter file is from NTF to RGF93 v1 (code 9327), assuming that RGF93 v1 is equivalent to RGF93 v2b within the accuracy of the transformation. May be emulated using NTv2 method - see CT code 9891.

Information source: Institut Geographique National (IGN) document NTG_88.pdf, "Grille de parametres de transformation de coordonnees". http://www.ign.fr

Revision date: 2022-01-24

Attributes

Unit: degree (supplier to define representation)

Geodetic CRS: NTF

Datum: Nouvelle Triangulation Francaise

Ellipsoid: Clarke 1880 (IGN)

Prime meridian: Greenwich

Data source: EPSG

Revision date: 2010-03-30

Scope: Geodesy.

Area of use: France - onshore - mainland and Corsica.

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

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SimpleMap

Center coordinates
inf inf

WGS84 bounds:
-4.87 41.31
9.63 51.14

France - onshore - mainland and Corsica.
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Definition: OGC Well Known Text 2 (2019)

BOUNDCRS[
    SOURCECRS[
        GEOGCRS["NTF",
            DATUM["Nouvelle Triangulation Francaise",
                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["France - onshore - mainland and Corsica."],
                BBOX[41.31,-4.87,51.14,9.63]],
            ID["EPSG",4275]]],
    TARGETCRS[
        GEOGCRS["RGF93 v2b",
            DATUM["Reseau Geodesique Francais 1993 v2b",
                ELLIPSOID["GRS 1980",6378137,298.257222101,
                    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["Horizontal component of 3D system."],
                AREA["France - onshore and offshore, mainland and Corsica (France métropolitaine including Corsica)."],
                BBOX[41.15,-9.86,51.56,10.38]],
            ID["EPSG",9782]]],
    ABRIDGEDTRANSFORMATION["NTF to RGF93 v2b (1)",
        METHOD["Geocentric translation by Grid Interpolation (IGN)",
            ID["EPSG",1087]],
        PARAMETERFILE["Geocentric translation file","gr3df97a.txt"],
        USAGE[
            SCOPE["Transformation of coordinates at 1m level of accuracy."],
            AREA["France - onshore - mainland and Corsica."],
            BBOX[41.31,-4.87,51.14,9.63]],
        ID["EPSG",9889],
        REMARK["Parameter file is from NTF to RGF93 v1 (code 9327), assuming that RGF93 v1 is equivalent to RGF93 v2b within the accuracy of the transformation. May be emulated using NTv2 method - see CT code 9891."]]]

Definition: PROJ.4

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

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:4275","+proj=longlat +ellps=clrk80ign +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "BoundCRS",
    "source_crs": {
        "type": "GeographicCRS",
        "name": "NTF",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Nouvelle Triangulation Francaise",
            "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": 4275
        }
    },
    "target_crs": {
        "type": "GeographicCRS",
        "name": "RGF93 v2b",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Reseau Geodesique Francais 1993 v2b",
            "ellipsoid": {
                "name": "GRS 1980",
                "semi_major_axis": 6378137,
                "inverse_flattening": 298.257222101
            }
        },
        "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": 9782
        }
    },
    "transformation": {
        "name": "NTF to RGF93 v2b (1)",
        "method": {
            "name": "Geocentric translation by Grid Interpolation (IGN)",
            "id": {
                "authority": "EPSG",
                "code": 1087
            }
        },
        "parameters": [
            {
                "name": "Geocentric translation file",
                "value": "gr3df97a.txt",
                "id": {
                    "authority": "EPSG",
                    "code": 8727
                }
            }
        ],
        "id": {
            "authority": "EPSG",
            "code": 9889
        }
    }
}

Definition: MapServer - MAPfile

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

Definition: Mapnik

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