Convert coordinates from Azores Occidental 1939 (EPSG:4182) 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 Azores Occidental 1939 (EPSG:4182) 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) | -422.651 | metre |
| Y-axis translation(ty) | -172.995 | metre |
| Z-axis translation(tz) | 84.02 | metre |
Derived at 2 stations in 1999.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -425 | metre |
| Y-axis translation(ty) | -169 | metre |
| Z-axis translation(tz) | 81 | 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:4182", "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 - Azores W - onshore
+proj=longlat +ellps=intl +no_defs +type=crsMore about EPSG:4182 →
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 →