EPSG:4809 — BD50 (Brussels)

Geographic 2D · Belgium - onshore

Export Formats

OGC WKT

GEOGCS[
    "BD50 (Brussels)",
    DATUM[
        "Reseau_National_Belge_1950_Brussels",
        SPHEROID["International 1924",6378388,297,AUTHORITY["EPSG","7022"]],
        AUTHORITY["EPSG","6809"]
    ],
    PRIMEM["Brussels",4.367975,AUTHORITY["EPSG","8910"]],
    UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],
    AUTHORITY["EPSG","4809"]
]

WKT2

GEOGCRS[
    "BD50 (Brussels)",
    DATUM[
        "Reseau National Belge 1950 (Brussels)",
        ELLIPSOID[
            "International 1924",
            6378388,
            297,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",7022]
        ],
        ID["EPSG",6809]
    ],
    PRIMEM[
        "Brussels",
        4.367975,
        ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
        ID["EPSG",8910]
    ],
    CS[ellipsoidal,2,ID["EPSG",6422]],
    AXIS["Geodetic latitude (Lat)",north],
    AXIS["Geodetic longitude (Lon)",east],
    ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
    ID["EPSG",4809]
]

PROJ.4

+proj=longlat +ellps=intl +pm=brussels +no_defs +type=crs

Proj4js

How to add a projection to Proj4js? →

proj4.defs("EPSG:4809", "+proj=longlat +ellps=intl +pm=brussels +no_defs +type=crs");

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 4809,
  "name": "BD50 (Brussels)",
  "kind": "geographic 2D",
  "area": "Belgium - onshore",
  "unit": "degree (supplier to define representation)",
  "bbox": [
    49.5,
    2.5,
    51.51,
    6.4
  ],
  "proj4": "+proj=longlat +ellps=intl +pm=brussels +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 (4809, 'EPSG', 4809, '+proj=longlat +ellps=intl +pm=brussels +no_defs +type=crs', 'GEOGCS["BD50 (Brussels)",DATUM["Reseau_National_Belge_1950_Brussels",SPHEROID["International 1924",6378388,297,AUTHORITY["EPSG","7022"]],AUTHORITY["EPSG","6809"]],PRIMEM["Brussels",4.367975,AUTHORITY["EPSG","8910"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4809"]]');

MapServer

How to add a projection to MapServer? →

PROJECTION
  "+proj=longlat"
  "+ellps=intl"
  "+pm=brussels"
  "+no_defs"
  "+type=crs"
END

GeoServer

How to add a projection to GeoServer? →

4809=GEOGCS["BD50 (Brussels)",DATUM["Reseau_National_Belge_1950_Brussels",SPHEROID["International 1924",6378388,297,AUTHORITY["EPSG","7022"]],AUTHORITY["EPSG","6809"]],PRIMEM["Brussels",4.367975,AUTHORITY["EPSG","8910"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4809"]]

Related Coordinate Systems

Available Transformations (1)

Transformation	Source → Target	Accuracy (m)
BD50 (Brussels) to BD50 (1)	4809 → 4215	0

Other CRS using Reseau National Belge 1950 (Brussels)

Frequently Asked Questions

How do I add EPSG:4809 to GeoServer?

Add the following definition to your GeoServer configuration:

4809=GEOGCS["BD50 (Brussels)",DATUM["Reseau_National_Belge_1950_Brussels",SPHEROID["International 1924",6378388,297,AUTHORITY["EPSG","7022"]],AUTHORITY["EPSG","6809"]],PRIMEM["Brussels",4.367975,AUTHORITY["EPSG","8910"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4809"]]

Read the full GeoServer guide →

How do I add EPSG:4809 to PostGIS?

Add the following definition to your PostGIS configuration:

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (4809, 'EPSG', 4809, '+proj=longlat +ellps=intl +pm=brussels +no_defs +type=crs', 'GEOGCS["BD50 (Brussels)",DATUM["Reseau_National_Belge_1950_Brussels",SPHEROID["International 1924",6378388,297,AUTHORITY["EPSG","7022"]],AUTHORITY["EPSG","6809"]],PRIMEM["Brussels",4.367975,AUTHORITY["EPSG","8910"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4809"]]');

Read the full PostGIS guide →

How do I add EPSG:4809 to MapServer?

Add the following definition to your MapServer configuration:

PROJECTION
  "+proj=longlat"
  "+ellps=intl"
  "+pm=brussels"
  "+no_defs"
  "+type=crs"
END

Read the full MapServer guide →

How do I use EPSG:4809 with Proj4js?

Add the following definition to your Proj4js configuration:

proj4.defs("EPSG:4809", "+proj=longlat +ellps=intl +pm=brussels +no_defs +type=crs");

Read the full Proj4js guide →