Convert coordinates from Datum 73 (EPSG:4274) to ETRS89 (EPSG:4258) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.
The EPSG Geodetic Parameter Dataset defines 5 transformations between Datum 73 (EPSG:4274) and ETRS89 (EPSG:4258). Each applies to a specific area — pick the one whose area of use covers your data.
Grid file: D73_ETRS89_geo.gsb
Derived from 1129 common stations in the national geodetic network. Residuals at 130 further test points average 0.06m, maximum 0.16m.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -231.034 | metre |
| Y-axis translation(ty) | 102.615 | metre |
| Z-axis translation(tz) | 26.836 | metre |
| X-axis rotation(rx) | -0.615 | arc-second |
| Y-axis rotation(ry) | 0.198 | arc-second |
| Z-axis rotation(rz) | -0.881 | arc-second |
| Scale difference(ds) | 1.786 | parts per million |
Parameters calculated in 1998 using 9 common stations. Published in 2001. Replaces Datum 73 to ETRS89 (1) (code 1657). Replaced by Datum 73 to ETRS89 (5) (code 5037).
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -238.2 | metre |
| Y-axis translation(ty) | 85.2 | metre |
| Z-axis translation(tz) | 29.9 | metre |
| X-axis rotation(rx) | 0.166 | arc-second |
| Y-axis rotation(ry) | 0.046 | arc-second |
| Z-axis rotation(rz) | 1.248 | arc-second |
| Scale difference(ds) | 2.03 | parts per million |
Derived in 2000 at 8 stations. Replaced by 2001 derivation (tfm code 1992). May be taken as approximate tfm to WGS 84 - see tfm 1658.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -230.994 | metre |
| Y-axis translation(ty) | 102.591 | metre |
| Z-axis translation(tz) | 25.199 | metre |
| X-axis rotation(rx) | 0.633 | arc-second |
| Y-axis rotation(ry) | -0.239 | arc-second |
| Z-axis rotation(rz) | 0.9 | arc-second |
| Scale difference(ds) | 1.95 | parts per million |
Derived in July 2009 from 119 common stations. Residuals at 833 test points under 2m. Replaces Datum 73 to ETRS89 (3) (tfm code 1992).
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -223.15 | metre |
| Y-axis translation(ty) | 110.132 | metre |
| Z-axis translation(tz) | 36.711 | metre |
Derived in July 2009 from 119 common stations. Residuals at 833 test points under 3m.
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4274", "EPSG:4258", 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: Portugal - mainland - onshore
+proj=longlat +ellps=intl +no_defs +type=crsMore about EPSG:4274 →
geographic system using latitude and longitude on an ellipsoid · Area of use: Europe - ETRF by country
+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs +type=crsMore about EPSG:4258 →