Convert coordinates from ED50(ED77) (EPSG:4154) 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 6 transformations between ED50(ED77) (EPSG:4154) 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) | -123.02 | metre |
| Y-axis translation(ty) | -158.95 | metre |
| Z-axis translation(tz) | -168.47 | metre |
Derived in Tombak district in March 2005. Used for South Pars phase 11.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -122.89 | metre |
| Y-axis translation(ty) | -159.08 | metre |
| Z-axis translation(tz) | -168.74 | metre |
Derived in Kangan district by Geoid for Total in 1998. Used for South Pars phases 2 and 3.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -84.78 | metre |
| Y-axis translation(ty) | -107.55 | metre |
| Z-axis translation(tz) | -137.25 | metre |
Derived in 1999 on Lavan island by Geoid for Elf.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -123.92 | metre |
| Y-axis translation(ty) | -155.515 | metre |
| Z-axis translation(tz) | -157.721 | metre |
Derived by Geoid for Elf in 1999. EGM96 geoid used.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -110.33 | metre |
| Y-axis translation(ty) | -97.73 | metre |
| Z-axis translation(tz) | -119.85 | metre |
| X-axis rotation(rx) | 0.3423 | arc-second |
| Y-axis rotation(ry) | 1.1634 | arc-second |
| Z-axis rotation(rz) | 0.2715 | arc-second |
| Scale difference(ds) | 0.063 | parts per million |
Used for South Pars phases 6, 7 and 8.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -117 | metre |
| Y-axis translation(ty) | -132 | metre |
| Z-axis translation(tz) | -164 | metre |
Given by DMA as from ED50. OGP interpret that as ED50(ED77) in Iran. Derived at 27 stations. Accuracy 9m, 12m and 11m in X, Y and Z axes.
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4154", "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: Iran
+proj=longlat +ellps=intl +no_defs +type=crsMore about EPSG:4154 →
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 →