Convert coordinates from Qatar 1974 (EPSG:4285) to WGS 84 (EPSG:4326) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.
The EPSG Geodetic Parameter Dataset defines 3 transformations between Qatar 1974 (EPSG:4285) and WGS 84 (EPSG:4326). Each applies to a specific area — pick the one whose area of use covers your data.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -128.16 | metre |
| Y-axis translation(ty) | -282.42 | metre |
| Z-axis translation(tz) | 21.93 | metre |
Derived by Brown & Root in 1992 for Qatar General Petroleum Corporation.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -128.033 | metre |
| Y-axis translation(ty) | -283.697 | metre |
| Z-axis translation(tz) | 21.052 | metre |
Derived by Qatar Centre for GIS. See Qatar 1974 to WGS 84 (2) (code 1562) for transformation used by QGPC for offshore petroleum industry.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -128 | metre |
| Y-axis translation(ty) | -283 | metre |
| Z-axis translation(tz) | 22 | metre |
Derived at 3 stations. Accuracy 20m in each axis.
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4285", "EPSG:4326", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)geographic system using latitude and longitude on an ellipsoid · Area of use: Qatar
+proj=longlat +ellps=intl +no_defs +type=crsMore about EPSG:4285 →
geographic system using latitude and longitude on an ellipsoid · Area of use: World (by country)
+proj=longlat +datum=WGS84 +no_defs +type=crsMore about EPSG:4326 →