EPSG:20499 — Ain el Abd / Bahrain Grid
Ain el Abd / Bahrain Grid (EPSG:20499) — a Projected (metres) system on the intl datum, used in Bahrain. Parameters, proj4, WKT, accuracy ±0.1 m, plus a free converter t…
At a glance
- EPSG
- 20499
- Name
- Ain el Abd / Bahrain Grid
- Kind
- Projected (metres)
- Family
- Universal Transverse Mercator (UTM)
- Ellipsoid
- intl
- Accuracy
- ±0.1 m (vs PROJ)
- Countries
- Bahrain
Area of use
| West | 50.39° |
| South | 25.53° |
| East | 50.85° |
| North | 26.34° |
Projection parameters
| Projection | utm |
| UTM zone | 39 |
| Ellipsoid | intl |
| Units | m |
| Helmert shift to WGS84 | -143,-236,7,0,0,0,0 |
+proj=utm +zone=39 +ellps=intl +units=m +no_defs +towgs84=-143,-236,7,0,0,0,0
PROJCS["Ain el Abd / Bahrain Grid",GEOGCS["GCS_Ain el Abd / Bahrain Grid",DATUM["D_International_1924",SPHEROID["International_1924",6378388,297],TOWGS84[-143,-236,7,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",51],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0],UNIT["Meter",1],AUTHORITY["EPSG","20499"]]
Sample conversion
Centre of the area of use: WGS84 50.62000, 25.93500 → EPSG:20499 461986.837, 2868525.769
Values are within ±0.1 m at the test point.
About the Universal Transverse Mercator (UTM) family
Ain el Abd / Bahrain Grid is a Universal Transverse Mercator zone — a 6°-wide belt of the worldwide UTM system, in metres, centred on a meridian carefully chosen so distortion stays low across the zone. It is the everyday working grid for GPS-derived surveying in Bahrain.
The classic field mistake with UTM is using the wrong zone: a point one zone away is easily hundreds of kilometres off. Always confirm the zone number (and the hemisphere) before importing coordinates, and remember that UTM eastings are offset by a 500 km false easting so they never go negative.
Related systems
Useful links: Converter · Batch converter · File converter
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