Convert coordinates from Lisbon 1890 (EPSG:4666) 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 2 transformations between Lisbon 1890 (EPSG:4666) 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) | 631.392 | metre |
| Y-axis translation(ty) | -66.551 | metre |
| Z-axis translation(tz) | 481.442 | metre |
| X-axis rotation(rx) | -1.09 | arc-second |
| Y-axis rotation(ry) | 4.445 | arc-second |
| Z-axis rotation(rz) | 4.487 | arc-second |
| Scale difference(ds) | -4.43 | parts per million |
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | 508.088 | metre |
| Y-axis translation(ty) | -191.042 | metre |
| Z-axis translation(tz) | 565.223 | metre |
May be taken as a transformation from Lisbon 1890 to ETRS89 - see tfm code 5039.
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4666", "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: Portugal - mainland - onshore
+proj=longlat +ellps=bessel +no_defs +type=crsMore about EPSG:4666 →
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 →