EPSG:27500 — ATF (Paris) / Nord de Guerre

Projected · France - Alsace

Export Formats

OGC WKT

PROJCS[
    "ATF (Paris) / Nord de Guerre",
    GEOGCS[
        "ATF (Paris)",
        DATUM[
            "Ancienne_Triangulation_Francaise_Paris",
            SPHEROID["Plessis 1817",6376523,308.64,AUTHORITY["EPSG","7027"]],
            AUTHORITY["EPSG","6901"]
        ],
        PRIMEM["Paris RGS",2.33720833333333,AUTHORITY["EPSG","8914"]],
        UNIT["grad",0.0157079632679489,AUTHORITY["EPSG","9105"]],
        AUTHORITY["EPSG","4901"]
    ],
    PROJECTION["Lambert_Conformal_Conic_1SP"],
    PARAMETER["latitude_of_origin",55],
    PARAMETER["central_meridian",6],
    PARAMETER["scale_factor",0.99950908],
    PARAMETER["false_easting",500000],
    PARAMETER["false_northing",300000],
    UNIT["metre",1,AUTHORITY["EPSG","9001"]],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","27500"]
]

WKT2

PROJCRS[
    "ATF (Paris) / Nord de Guerre",
    BASEGEOGCRS[
        "ATF (Paris)",
        DATUM[
            "Ancienne Triangulation Francaise (Paris)",
            ELLIPSOID[
                "Plessis 1817",
                6376523,
                308.64,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",7027]
            ],
            ID["EPSG",6901]
        ],
        PRIMEM[
            "Paris RGS",
            2.337208333,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8914]
        ],
        ID["EPSG",4901]
    ],
    CONVERSION[
        "Nord de Guerre",
        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",
            6,
            ANGLEUNIT["grad",0.015707963267949,ID["EPSG",9105]],
            ID["EPSG",8802]
        ],
        PARAMETER[
            "Scale factor at natural origin",
            0.99950908,
            SCALEUNIT["unity",1,ID["EPSG",9201]],
            ID["EPSG",8805]
        ],
        PARAMETER[
            "False easting",
            500000,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8806]
        ],
        PARAMETER[
            "False northing",
            300000,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8807]
        ],
        ID["EPSG",19903]
    ],
    CS[Cartesian,2,ID["EPSG",4499]],
    AXIS["Easting (X)",east],
    AXIS["Northing (Y)",north],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",27500]
]

PROJ.4

+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=5.4 +k_0=0.99950908 +x_0=500000 +y_0=300000 +a=6376523 +rf=308.64 +pm=2.33720833333333 +units=m +no_defs +type=crs

Proj4js

How to add a projection to Proj4js? →

proj4.defs("EPSG:27500", "+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=5.4 +k_0=0.99950908 +x_0=500000 +y_0=300000 +a=6376523 +rf=308.64 +pm=2.33720833333333 +units=m +no_defs +type=crs");

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 27500,
  "name": "ATF (Paris) / Nord de Guerre",
  "kind": "projected",
  "area": "France - Alsace",
  "unit": "metre",
  "bbox": [
    47.42,
    6.84,
    49.07,
    8.23
  ],
  "proj4": "+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=5.4 +k_0=0.99950908 +x_0=500000 +y_0=300000 +a=6376523 +rf=308.64 +pm=2.33720833333333 +units=m +no_defs +type=crs"
}

PostGIS

How to add a projection to PostGIS? →

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (27500, 'EPSG', 27500, '+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=5.4 +k_0=0.99950908 +x_0=500000 +y_0=300000 +a=6376523 +rf=308.64 +pm=2.33720833333333 +units=m +no_defs +type=crs', 'PROJCS["ATF (Paris) / Nord de Guerre",GEOGCS["ATF (Paris)",DATUM["Ancienne_Triangulation_Francaise_Paris",SPHEROID["Plessis 1817",6376523,308.64,AUTHORITY["EPSG","7027"]],AUTHORITY["EPSG","6901"]],PRIMEM["Paris RGS",2.33720833333333,AUTHORITY["EPSG","8914"]],UNIT["grad",0.0157079632679489,AUTHORITY["EPSG","9105"]],AUTHORITY["EPSG","4901"]],PROJECTION["Lambert_Conformal_Conic_1SP"],PARAMETER["latitude_of_origin",55],PARAMETER["central_meridian",6],PARAMETER["scale_factor",0.99950908],PARAMETER["false_easting",500000],PARAMETER["false_northing",300000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27500"]]');

MapServer

How to add a projection to MapServer? →

PROJECTION
  "+proj=lcc"
  "+lat_1=49.5"
  "+lat_0=49.5"
  "+lon_0=5.4"
  "+k_0=0.99950908"
  "+x_0=500000"
  "+y_0=300000"
  "+a=6376523"
  "+rf=308.64"
  "+pm=2.33720833333333"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

GeoServer

How to add a projection to GeoServer? →

27500=PROJCS["ATF (Paris) / Nord de Guerre",GEOGCS["ATF (Paris)",DATUM["Ancienne_Triangulation_Francaise_Paris",SPHEROID["Plessis 1817",6376523,308.64,AUTHORITY["EPSG","7027"]],AUTHORITY["EPSG","6901"]],PRIMEM["Paris RGS",2.33720833333333,AUTHORITY["EPSG","8914"]],UNIT["grad",0.0157079632679489,AUTHORITY["EPSG","9105"]],AUTHORITY["EPSG","4901"]],PROJECTION["Lambert_Conformal_Conic_1SP"],PARAMETER["latitude_of_origin",55],PARAMETER["central_meridian",6],PARAMETER["scale_factor",0.99950908],PARAMETER["false_easting",500000],PARAMETER["false_northing",300000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27500"]]

Other CRS using Ancienne Triangulation Francaise (Paris)

Frequently Asked Questions

How do I add EPSG:27500 to GeoServer?

Add the following definition to your GeoServer configuration:

27500=PROJCS["ATF (Paris) / Nord de Guerre",GEOGCS["ATF (Paris)",DATUM["Ancienne_Triangulation_Francaise_Paris",SPHEROID["Plessis 1817",6376523,308.64,AUTHORITY["EPSG","7027"]],AUTHORITY["EPSG","6901"]],PRIMEM["Paris RGS",2.33720833333333,AUTHORITY["EPSG","8914"]],UNIT["grad",0.0157079632679489,AUTHORITY["EPSG","9105"]],AUTHORITY["EPSG","4901"]],PROJECTION["Lambert_Conformal_Conic_1SP"],PARAMETER["latitude_of_origin",55],PARAMETER["central_meridian",6],PARAMETER["scale_factor",0.99950908],PARAMETER["false_easting",500000],PARAMETER["false_northing",300000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27500"]]

Read the full GeoServer guide →

How do I add EPSG:27500 to PostGIS?

Add the following definition to your PostGIS configuration:

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (27500, 'EPSG', 27500, '+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=5.4 +k_0=0.99950908 +x_0=500000 +y_0=300000 +a=6376523 +rf=308.64 +pm=2.33720833333333 +units=m +no_defs +type=crs', 'PROJCS["ATF (Paris) / Nord de Guerre",GEOGCS["ATF (Paris)",DATUM["Ancienne_Triangulation_Francaise_Paris",SPHEROID["Plessis 1817",6376523,308.64,AUTHORITY["EPSG","7027"]],AUTHORITY["EPSG","6901"]],PRIMEM["Paris RGS",2.33720833333333,AUTHORITY["EPSG","8914"]],UNIT["grad",0.0157079632679489,AUTHORITY["EPSG","9105"]],AUTHORITY["EPSG","4901"]],PROJECTION["Lambert_Conformal_Conic_1SP"],PARAMETER["latitude_of_origin",55],PARAMETER["central_meridian",6],PARAMETER["scale_factor",0.99950908],PARAMETER["false_easting",500000],PARAMETER["false_northing",300000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27500"]]');

Read the full PostGIS guide →

How do I add EPSG:27500 to MapServer?

Add the following definition to your MapServer configuration:

PROJECTION
  "+proj=lcc"
  "+lat_1=49.5"
  "+lat_0=49.5"
  "+lon_0=5.4"
  "+k_0=0.99950908"
  "+x_0=500000"
  "+y_0=300000"
  "+a=6376523"
  "+rf=308.64"
  "+pm=2.33720833333333"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

Read the full MapServer guide →

How do I use EPSG:27500 with Proj4js?

Add the following definition to your Proj4js configuration:

proj4.defs("EPSG:27500", "+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=5.4 +k_0=0.99950908 +x_0=500000 +y_0=300000 +a=6376523 +rf=308.64 +pm=2.33720833333333 +units=m +no_defs +type=crs");

Read the full Proj4js guide →