EPSG:21500 BD50 (Brussels) / Belge Lambert 50
Projected system (Lambert Conic Conformal (2SP)) in use: Belgium - onshore. The full definition below, and conversion in one click.
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:21500 |
|---|---|
| Name | BD50 (Brussels) / Belge Lambert 50 |
| Type | Projected system — Lambert Conic Conformal (2SP) |
| 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 |
| Base geographic system | EPSG:4809 — BD50 (Brussels) |
| Unit | metre (X east, Y north) |
| Transformation to WGS 84 | No simple transformation published (ellipsoid alone) |
| Scope | Engineering survey, topographic mapping. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of false origin | 90 | degree |
| Longitude of false origin | 0 | degree |
| Latitude of 1st standard parallel | 49.833333333333336 | degree |
| Latitude of 2nd standard parallel | 51.166666666666664 | degree |
| Easting at false origin | 150000 | metre |
| Northing at false origin | 5400000 | metre |
proj4 definition
+proj=lcc +lat_0=90 +lon_0=0 +lat_1=49.8333333333333 +lat_2=51.1666666666667 +x_0=150000 +y_0=5400000 +ellps=intl +pm=brussels +units=m +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:21500.
WKT (ESRI format, the .prj content)
PROJCS["Belge_Lambert_1950",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]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",150000.0],PARAMETER["False_Northing",5400000.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",49.8333333333333],PARAMETER["Standard_Parallel_2",51.1666666666667],PARAMETER["Latitude_Of_Origin",90.0],UNIT["Meter",1.0]]Other systems — Belgium
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.