EPSG:20790 — Lisbon (Lisbon) / Portuguese National Grid

Projected · Portugal - mainland - onshore

Export Formats

WKT2

PROJCRS[
    "Lisbon (Lisbon) / Portuguese National Grid",
    BASEGEOGCRS[
        "Lisbon (Lisbon)",
        DATUM[
            "Lisbon 1937 (Lisbon)",
            ELLIPSOID[
                "International 1924",
                6378388,
                297,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",7022]
            ],
            ID["EPSG",6803]
        ],
        PRIMEM[
            "Lisbon",
            -9.131906111,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8902]
        ],
        ID["EPSG",4803]
    ],
    CONVERSION[
        "Portuguese National Grid",
        METHOD["Transverse Mercator",ID["EPSG",9807]],
        PARAMETER[
            "Latitude of natural origin",
            39.6666666666669,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8801]
        ],
        PARAMETER[
            "Longitude of natural origin",
            1,
            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",
            200000,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8806]
        ],
        PARAMETER[
            "False northing",
            300000,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8807]
        ],
        ID["EPSG",19936]
    ],
    CS[Cartesian,2,ID["EPSG",4499]],
    AXIS["Easting (X)",east],
    AXIS["Northing (Y)",north],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",20790]
]

PROJ.4

+proj=tmerc +lat_0=39.6666666666667 +lon_0=1 +k=1 +x_0=200000 +y_0=300000 +ellps=intl +pm=lisbon +units=m +no_defs +type=crs

Proj4js

How to add a projection to Proj4js? →

proj4.defs("EPSG:20790", "+proj=tmerc +lat_0=39.6666666666667 +lon_0=1 +k=1 +x_0=200000 +y_0=300000 +ellps=intl +pm=lisbon +units=m +no_defs +type=crs");

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 20790,
  "name": "Lisbon (Lisbon) / Portuguese National Grid",
  "kind": "projected",
  "area": "Portugal - mainland - onshore",
  "unit": "metre",
  "bbox": [
    36.95,
    -9.56,
    42.16,
    -6.19
  ],
  "proj4": "+proj=tmerc +lat_0=39.6666666666667 +lon_0=1 +k=1 +x_0=200000 +y_0=300000 +ellps=intl +pm=lisbon +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 (20790, 'EPSG', 20790, '+proj=tmerc +lat_0=39.6666666666667 +lon_0=1 +k=1 +x_0=200000 +y_0=300000 +ellps=intl +pm=lisbon +units=m +no_defs +type=crs', '');

MapServer

How to add a projection to MapServer? →

PROJECTION
  "+proj=tmerc"
  "+lat_0=39.6666666666667"
  "+lon_0=1"
  "+k=1"
  "+x_0=200000"
  "+y_0=300000"
  "+ellps=intl"
  "+pm=lisbon"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

Related Coordinate Systems

Available Transformations (4)

Transformations inherited from base CRS: EPSG:4803 (Lisbon (Lisbon))

Transformation	Source → Target	Accuracy (m)
Lisbon (Lisbon) to Lisbon (1)	4803 → 4207	0
Lisbon (Lisbon) to WGS 84 (2)	4803 → 4326	2
Lisbon (Lisbon) to Lisbon (Greenwich) Deprecated	4803 → 4207	—
Lisbon (Lisbon) to WGS 84 (1) Deprecated	4803 → 4326	—

Other CRS using Lisbon 1937 (Lisbon)

Frequently Asked Questions

How do I add EPSG:20790 to PostGIS?

Add the following definition to your PostGIS configuration:

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (20790, 'EPSG', 20790, '+proj=tmerc +lat_0=39.6666666666667 +lon_0=1 +k=1 +x_0=200000 +y_0=300000 +ellps=intl +pm=lisbon +units=m +no_defs +type=crs', '');

Read the full PostGIS guide →

How do I add EPSG:20790 to MapServer?

Add the following definition to your MapServer configuration:

PROJECTION
  "+proj=tmerc"
  "+lat_0=39.6666666666667"
  "+lon_0=1"
  "+k=1"
  "+x_0=200000"
  "+y_0=300000"
  "+ellps=intl"
  "+pm=lisbon"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

Read the full MapServer guide →

How do I use EPSG:20790 with Proj4js?

Add the following definition to your Proj4js configuration:

proj4.defs("EPSG:20790", "+proj=tmerc +lat_0=39.6666666666667 +lon_0=1 +k=1 +x_0=200000 +y_0=300000 +ellps=intl +pm=lisbon +units=m +no_defs +type=crs");

Read the full Proj4js guide →