EPSG:28991 Amersfoort / RD Old
Projected system (Oblique Stereographic) in use: Netherlands - onshore. The full definition below, and conversion in one click.
| Code | EPSG:28991 |
|---|---|
| Name | Amersfoort / RD Old |
| Type | Projected system — Oblique Stereographic |
| Area of use |
Netherlands - onshore Netherlands - onshore, including Waddenzee, Dutch Wadden Islands and 12-mile offshore coastal zone. |
| Bounds | W 3,20° · S 50,75° · E 7,22° · N 53,70° |
| Countries | Netherlands |
| Datum | Amersfoort |
| Ellipsoid | Bessel 1841 a = 6377397.155 m · 1/f = 299.1528128 |
| Base geographic system | EPSG:4289 — Amersfoort |
| Unit | metre (X east, Y north) |
| Transformation to WGS 84 | Amersfoort to WGS 84 (4) (EPSG:4833) — accuracy 1 m |
| Scope | Engineering survey, topographic mapping. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 52.15616055555555 | degree |
| Longitude of natural origin | 5.3876388888888895 | degree |
| Scale factor at natural origin | 0.9999079 | unity |
| False easting | 0 | metre |
| False northing | 0 | metre |
proj4 definition
+proj=sterea +lat_0=52.1561605555556 +lon_0=5.38763888888889 +k=0.9999079 +x_0=0 +y_0=0 +ellps=bessel +units=m +towgs84=565.4171,50.3319,465.5524,-0.398957,0.343988,-1.877402,4.0725 +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:28991.
WKT (ESRI format, the .prj content)
PROJCS["RD_Old",GEOGCS["GCS_Amersfoort",DATUM["D_Amersfoort",SPHEROID["Bessel_1841",6377397.155,299.1528128]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Double_Stereographic"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",5.38763888888889],PARAMETER["Scale_Factor",0.9999079],PARAMETER["Latitude_Of_Origin",52.1561605555556],UNIT["Meter",1.0]]Other systems — Netherlands
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.