EPSG:27493 — Datum 73 / Modified Portuguese Grid

Projected · Portugal - mainland - onshore

Export Formats

OGC WKT

PROJCS[
    "Datum 73 / Modified Portuguese Grid",
    GEOGCS[
        "Datum 73",
        DATUM[
            "Datum_73",
            SPHEROID["International 1924",6378388,297],
            TOWGS84[-239.749,88.181,30.488,-0.263,-0.082,-1.211,2.229]
        ],
        PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4274"]
    ],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",39.6666666666667],
    PARAMETER["central_meridian",-8.13190611111111],
    PARAMETER["scale_factor",1],
    PARAMETER["false_easting",180.598],
    PARAMETER["false_northing",-86.99],
    UNIT["metre",1,AUTHORITY["EPSG","9001"]],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","27493"]
]

WKT2

PROJCRS[
    "Datum 73 / Modified Portuguese Grid",
    BASEGEOGCRS[
        "Datum 73",
        DATUM[
            "Datum 73",
            ELLIPSOID[
                "International 1924",
                6378388,
                297,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",7022]
            ],
            ID["EPSG",6274]
        ],
        ID["EPSG",4274]
    ],
    CONVERSION[
        "Modified Portuguese 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",
            -8.13190611111139,
            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",
            180.598,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8806]
        ],
        PARAMETER[
            "False northing",
            -86.99,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8807]
        ],
        ID["EPSG",19974]
    ],
    CS[Cartesian,2,ID["EPSG",4499]],
    AXIS["Easting (X)",east],
    AXIS["Northing (Y)",north],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",27493]
]

PROJ.4

+proj=tmerc +lat_0=39.6666666666667 +lon_0=-8.13190611111111 +k=1 +x_0=180.598 +y_0=-86.99 +ellps=intl +towgs84=-239.749,88.181,30.488,-0.263,-0.082,-1.211,2.229 +units=m +no_defs +type=crs

Proj4js

How to add a projection to Proj4js? →

proj4.defs("EPSG:27493", "+proj=tmerc +lat_0=39.6666666666667 +lon_0=-8.13190611111111 +k=1 +x_0=180.598 +y_0=-86.99 +ellps=intl +towgs84=-239.749,88.181,30.488,-0.263,-0.082,-1.211,2.229 +units=m +no_defs +type=crs");

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 27493,
  "name": "Datum 73 / Modified Portuguese 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=-8.13190611111111 +k=1 +x_0=180.598 +y_0=-86.99 +ellps=intl +towgs84=-239.749,88.181,30.488,-0.263,-0.082,-1.211,2.229 +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 (27493, 'EPSG', 27493, '+proj=tmerc +lat_0=39.6666666666667 +lon_0=-8.13190611111111 +k=1 +x_0=180.598 +y_0=-86.99 +ellps=intl +towgs84=-239.749,88.181,30.488,-0.263,-0.082,-1.211,2.229 +units=m +no_defs +type=crs', 'PROJCS["Datum 73 / Modified Portuguese Grid",GEOGCS["Datum 73",DATUM["Datum_73",SPHEROID["International 1924",6378388,297],TOWGS84[-239.749,88.181,30.488,-0.263,-0.082,-1.211,2.229]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4274"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",39.6666666666667],PARAMETER["central_meridian",-8.13190611111111],PARAMETER["scale_factor",1],PARAMETER["false_easting",180.598],PARAMETER["false_northing",-86.99],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27493"]]');

MapServer

How to add a projection to MapServer? →

PROJECTION
  "+proj=tmerc"
  "+lat_0=39.6666666666667"
  "+lon_0=-8.13190611111111"
  "+k=1"
  "+x_0=180.598"
  "+y_0=-86.99"
  "+ellps=intl"
  "+towgs84=-239.749,88.181,30.488,-0.263,-0.082,-1.211,2.229"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

GeoServer

How to add a projection to GeoServer? →

27493=PROJCS["Datum 73 / Modified Portuguese Grid",GEOGCS["Datum 73",DATUM["Datum_73",SPHEROID["International 1924",6378388,297],TOWGS84[-239.749,88.181,30.488,-0.263,-0.082,-1.211,2.229]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4274"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",39.6666666666667],PARAMETER["central_meridian",-8.13190611111111],PARAMETER["scale_factor",1],PARAMETER["false_easting",180.598],PARAMETER["false_northing",-86.99],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27493"]]

Related Coordinate Systems

Available Transformations (11)

Transformations inherited from base CRS: EPSG:4274 (Datum 73)

Transformation	Source → Target	Accuracy (m)
Datum 73 to ETRS89-PRT [1995] (6)	4274 → 11108	0.1
Datum 73 to WGS 84 (4)	4274 → 4326	1
Datum 73 to ETRS89 (3)	4274 → 4258	1
Datum 73 to ETRS89 (1)	4274 → 4258	2
Datum 73 to WGS 84 (1)	4274 → 4326	2
Datum 73 to ETRS89-PRT [1995] (5)	4274 → 11108	2
Datum 73 to ETRS89-PRT [1995] (4)	4274 → 11108	3
Datum 73 to WGS 84 (3)	4274 → 4326	5
Datum 73 to ETRS89 (2) Deprecated	4274 → 4258	—
Datum 73 to WGS 84 (2) Deprecated	4274 → 4258	—

Other CRS using Datum 73

Frequently Asked Questions

How do I add EPSG:27493 to GeoServer?

Add the following definition to your GeoServer configuration:

27493=PROJCS["Datum 73 / Modified Portuguese Grid",GEOGCS["Datum 73",DATUM["Datum_73",SPHEROID["International 1924",6378388,297],TOWGS84[-239.749,88.181,30.488,-0.263,-0.082,-1.211,2.229]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4274"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",39.6666666666667],PARAMETER["central_meridian",-8.13190611111111],PARAMETER["scale_factor",1],PARAMETER["false_easting",180.598],PARAMETER["false_northing",-86.99],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27493"]]

Read the full GeoServer guide →

How do I add EPSG:27493 to PostGIS?

Add the following definition to your PostGIS configuration:

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (27493, 'EPSG', 27493, '+proj=tmerc +lat_0=39.6666666666667 +lon_0=-8.13190611111111 +k=1 +x_0=180.598 +y_0=-86.99 +ellps=intl +towgs84=-239.749,88.181,30.488,-0.263,-0.082,-1.211,2.229 +units=m +no_defs +type=crs', 'PROJCS["Datum 73 / Modified Portuguese Grid",GEOGCS["Datum 73",DATUM["Datum_73",SPHEROID["International 1924",6378388,297],TOWGS84[-239.749,88.181,30.488,-0.263,-0.082,-1.211,2.229]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4274"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",39.6666666666667],PARAMETER["central_meridian",-8.13190611111111],PARAMETER["scale_factor",1],PARAMETER["false_easting",180.598],PARAMETER["false_northing",-86.99],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27493"]]');

Read the full PostGIS guide →

How do I add EPSG:27493 to MapServer?

Add the following definition to your MapServer configuration:

PROJECTION
  "+proj=tmerc"
  "+lat_0=39.6666666666667"
  "+lon_0=-8.13190611111111"
  "+k=1"
  "+x_0=180.598"
  "+y_0=-86.99"
  "+ellps=intl"
  "+towgs84=-239.749,88.181,30.488,-0.263,-0.082,-1.211,2.229"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

Read the full MapServer guide →

How do I use EPSG:27493 with Proj4js?

Add the following definition to your Proj4js configuration:

proj4.defs("EPSG:27493", "+proj=tmerc +lat_0=39.6666666666667 +lon_0=-8.13190611111111 +k=1 +x_0=180.598 +y_0=-86.99 +ellps=intl +towgs84=-239.749,88.181,30.488,-0.263,-0.082,-1.211,2.229 +units=m +no_defs +type=crs");

Read the full Proj4js guide →

Type

Projected

Unit

metre

Geodetic CRS

Datum 73

Datum

Datum 73

Ellipsoid

International 1924

Prime Meridian

Greenwich

Area of Use

Portugal - mainland - onshore

Portugal - mainland - onshore.

Coordinate System

Cartesian 2D CS. Axes: easting, northing (X,Y). Orientations: east, north. UoM: m.

Center Coordinates

22231.36 -12550.28

Projected Bounds

278534.97 -127052.05160638.85 -300789.61

WGS84 Bounds

42.16 -9.56-6.19 36.95

Data Source

EPSG

Information Source

Geodetic Services Directorate, Instituto Geografico e Cadastral, Lisbon; http://www.igeo.pt/

Revision Date

2008-03-14

Scope

Engineering survey, topographic mapping.

Remarks

The projection parameters have been designed such that this CRS grid is almost the same as the Lisbon (Lisbon)/Portuguese Grid (CRS code 20791).

EPSG

27493