EPSG:4809 BD50 (Brussels)
Geographic system in latitude and longitude, in use: Belgium - onshore. Datum, ellipsoid and transformation to WGS 84 below.
EPSG publishes no simple transformation to WGS 84 for this datum: conversion works on the ellipsoid alone and can be off by tens of metres.
| Code | EPSG:4809 |
|---|---|
| Name | BD50 (Brussels) |
| Type | Geographic system |
| Area of use | Belgium - onshore |
| Bounds | W 2,50° · S 49,50° · E 6,40° · N 51,51° |
| Countries | Belgium |
| Datum | Reseau National Belge 1950 (Brussels) |
| Ellipsoid | International 1924 a = 6378388 m · 1/f = 297 |
| Prime meridian | Brussels 4.3679749999999995 degree |
| Unit | degree (Lat north, Lon east) |
| Transformation to WGS 84 | No simple transformation published (ellipsoid alone) |
| Scope | Geodesy. |
proj4 definition
+proj=longlat +ellps=intl +pm=brussels +no_defsPaste it into QGIS, proj4js, PostGIS (spatial_ref_sys) or GDAL. +towgs84 carries the EPSG transformation to WGS 84; the official code stays EPSG:4809.
WKT (ESRI format, the .prj content)
GEOGCS["GCS_Belge_1950_Brussels",DATUM["Reseau_National_Belge_1950_(Brussels)",SPHEROID["International_1924",6378388.0,297.0]],PRIMEM["Brussels",4.367975],UNIT["Degree",0.0174532925199433]]Other systems — Belgium
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.