EPSG:CODE

EPSG:27561 — NTF (Paris) / Lambert Nord France

Projected · France - mainland north of 48.15°N

Export Formats

WKT2
PROJCRS[
    "NTF (Paris) / Lambert Nord France",
    BASEGEOGCRS[
        "NTF (Paris)",
        DATUM[
            "Nouvelle Triangulation Francaise (Paris)",
            ELLIPSOID[
                "Clarke 1880 (IGN)",
                6378249.2,
                293.466021293627,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",7011]
            ],
            ID["EPSG",6807]
        ],
        PRIMEM[
            "Paris",
            0.040792344,
            ANGLEUNIT["radian",1,ID["EPSG",9101]],
            ID["EPSG",8903]
        ],
        ID["EPSG",4807]
    ],
    CONVERSION[
        "Lambert Nord France",
        METHOD["Lambert Conic Conformal (1SP)",ID["EPSG",9801]],
        PARAMETER[
            "Latitude of natural origin",
            55,
            ANGLEUNIT["grad",0.015707963267949,ID["EPSG",9105]],
            ID["EPSG",8801]
        ],
        PARAMETER[
            "Longitude of natural origin",
            0,
            ANGLEUNIT["grad",0.015707963267949,ID["EPSG",9105]],
            ID["EPSG",8802]
        ],
        PARAMETER[
            "Scale factor at natural origin",
            0.999877341,
            SCALEUNIT["unity",1,ID["EPSG",9201]],
            ID["EPSG",8805]
        ],
        PARAMETER[
            "False easting",
            600000,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8806]
        ],
        PARAMETER[
            "False northing",
            200000,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8807]
        ],
        ID["EPSG",18091]
    ],
    CS[Cartesian,2,ID["EPSG",4499]],
    AXIS["Easting (X)",east],
    AXIS["Northing (Y)",north],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",27561]
]

Related Coordinate Systems

Available Transformations (10)

Transformations inherited from base CRS: EPSG:4807 (NTF (Paris))

Transformation Source → Target Accuracy (m)
NTF (Paris) to NTF (1)
4807 → 4275 0
NTF (Paris) to NTF (2)
4807 → 4275 0
NTF (Paris) to ETRS89-FRA [RGF93 v1] (2)
4807 → 4171 1
NTF (Paris) to ETRS89-FRA [RGF93 v1] (1)
4807 → 4171 1
NTF (Paris) to WGS 84 (1)
4807 → 4326 2
NTF (Paris) to ED50 (1)
4807 → 4230 2
NTF (Paris) to WGS 72 (1)
4807 → 4322 2
NTF (Paris) to NTF (Greenwich) (1) Deprecated
4807 → 4275 —
NTF (Paris) to NTF (Greenwich) (2) Deprecated
4807 → 4275 —
NTF (Paris) to RGF93 (1) Deprecated
4807 → 4171 1

Other CRS using Nouvelle Triangulation Francaise (Paris)

Frequently Asked Questions

How do I add EPSG:27561 to PostGIS?

Add the following definition to your PostGIS configuration: 

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (27561, 'EPSG', 27561, '+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=0 +k_0=0.999877341 +x_0=600000 +y_0=200000 +ellps=clrk80ign +pm=paris +units=m +no_defs +type=crs', '');
Read the full PostGIS guide →

How do I add EPSG:27561 to MapServer?

Add the following definition to your MapServer configuration: 

PROJECTION
  "+proj=lcc"
  "+lat_1=49.5"
  "+lat_0=49.5"
  "+lon_0=0"
  "+k_0=0.999877341"
  "+x_0=600000"
  "+y_0=200000"
  "+ellps=clrk80ign"
  "+pm=paris"
  "+units=m"
  "+no_defs"
  "+type=crs"
END
Read the full MapServer guide →

How do I use EPSG:27561 with Proj4js?

Add the following definition to your Proj4js configuration: 

proj4.defs("EPSG:27561", "+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=0 +k_0=0.999877341 +x_0=600000 +y_0=200000 +ellps=clrk80ign +pm=paris +units=m +no_defs +type=crs");
Read the full Proj4js guide →