EPSG:27391 — NGO 1948 (Oslo) / NGO zone I

Projected · Norway - zone I

Export Formats

WKT2

PROJCRS[
    "NGO 1948 (Oslo) / NGO zone I",
    BASEGEOGCRS[
        "NGO 1948 (Oslo)",
        DATUM[
            "NGO 1948 (Oslo)",
            ELLIPSOID[
                "Bessel Modified",
                6377492.018,
                299.1528128,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",7005]
            ],
            ID["EPSG",6817]
        ],
        PRIMEM[
            "Oslo",
            10.722916667,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8913]
        ],
        ID["EPSG",4817]
    ],
    CONVERSION[
        "NGO zone I",
        METHOD["Transverse Mercator",ID["EPSG",9807]],
        PARAMETER[
            "Latitude of natural origin",
            58,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8801]
        ],
        PARAMETER[
            "Longitude of natural origin",
            -4.66666666666695,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8802]
        ],
        PARAMETER[
            "Scale factor at natural origin",
            1,
            SCALEUNIT["unity",1,ID["EPSG",9201]],
            ID["EPSG",8805]
        ],
        PARAMETER[
            "False easting",
            0,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8806]
        ],
        PARAMETER[
            "False northing",
            0,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8807]
        ],
        ID["EPSG",18221]
    ],
    CS[Cartesian,2,ID["EPSG",4531]],
    AXIS["Northing (x)",north],
    AXIS["Easting (y)",east],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",27391]
]

PROJ.4

+proj=tmerc +lat_0=58 +lon_0=-4.66666666666667 +k=1 +x_0=0 +y_0=0 +a=6377492.018 +rf=299.1528128 +pm=oslo +units=m +no_defs +type=crs

Proj4js

How to add a projection to Proj4js? →

proj4.defs("EPSG:27391", "+proj=tmerc +lat_0=58 +lon_0=-4.66666666666667 +k=1 +x_0=0 +y_0=0 +a=6377492.018 +rf=299.1528128 +pm=oslo +units=m +no_defs +type=crs");

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 27391,
  "name": "NGO 1948 (Oslo) / NGO zone I",
  "kind": "projected",
  "area": "Norway - zone I",
  "unit": "metre",
  "bbox": [
    57.92,
    4.39,
    63.17,
    7.23
  ],
  "proj4": "+proj=tmerc +lat_0=58 +lon_0=-4.66666666666667 +k=1 +x_0=0 +y_0=0 +a=6377492.018 +rf=299.1528128 +pm=oslo +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 (27391, 'EPSG', 27391, '+proj=tmerc +lat_0=58 +lon_0=-4.66666666666667 +k=1 +x_0=0 +y_0=0 +a=6377492.018 +rf=299.1528128 +pm=oslo +units=m +no_defs +type=crs', '');

MapServer

How to add a projection to MapServer? →

PROJECTION
  "+proj=tmerc"
  "+lat_0=58"
  "+lon_0=-4.66666666666667"
  "+k=1"
  "+x_0=0"
  "+y_0=0"
  "+a=6377492.018"
  "+rf=299.1528128"
  "+pm=oslo"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

Related Coordinate Systems

Available Transformations (3)

Transformations inherited from base CRS: EPSG:4817 (NGO 1948 (Oslo))

Transformation	Source → Target	Accuracy (m)
NGO 1948 (Oslo) to NGO1948 (1)	4817 → 4273	0
NGO 1948 (Oslo) to WGS 84 (1)	4817 → 4326	3
NGO 1948 (Oslo) to NGO1948 (Greenwich) Deprecated	4817 → 4273	—

Other CRS using NGO 1948 (Oslo)

Frequently Asked Questions

How do I add EPSG:27391 to PostGIS?

Add the following definition to your PostGIS configuration:

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (27391, 'EPSG', 27391, '+proj=tmerc +lat_0=58 +lon_0=-4.66666666666667 +k=1 +x_0=0 +y_0=0 +a=6377492.018 +rf=299.1528128 +pm=oslo +units=m +no_defs +type=crs', '');

Read the full PostGIS guide →

How do I add EPSG:27391 to MapServer?

Add the following definition to your MapServer configuration:

PROJECTION
  "+proj=tmerc"
  "+lat_0=58"
  "+lon_0=-4.66666666666667"
  "+k=1"
  "+x_0=0"
  "+y_0=0"
  "+a=6377492.018"
  "+rf=299.1528128"
  "+pm=oslo"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

Read the full MapServer guide →

How do I use EPSG:27391 with Proj4js?

Add the following definition to your Proj4js configuration:

proj4.defs("EPSG:27391", "+proj=tmerc +lat_0=58 +lon_0=-4.66666666666667 +k=1 +x_0=0 +y_0=0 +a=6377492.018 +rf=299.1528128 +pm=oslo +units=m +no_defs +type=crs");

Read the full Proj4js guide →