Convert coordinates from TM75 (EPSG:4300) 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 2 transformations between TM75 (EPSG:4300) and ETRS89 (EPSG:4258). Each applies to a specific area — pick the one whose area of use covers your data.
Grid file: tm75_etrs89.gsb
Approximate alternative to official OS polynomial method (tfm code 1041). May be taken as approximate transformation TM75 to WGS 84 - see code 6947.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | 482.5 | metre |
| Y-axis translation(ty) | -130.6 | metre |
| Z-axis translation(tz) | 564.6 | metre |
| X-axis rotation(rx) | -1.042 | arc-second |
| Y-axis rotation(ry) | -0.214 | arc-second |
| Z-axis rotation(rz) | -0.631 | arc-second |
| Scale difference(ds) | 8.15 | parts per million |
TM75 is based on the geodetic datum of 1965 which should not be confused with the mapping adjustment of 1965 (TM65). May be taken as approximate transformations TM75 to WGS 84, TM65 to WGS 84 and OSNI 1952 to WGS 84 - see codes 1954, 1641 and 1955.
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4300", "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: Europe - Ireland (Republic and Ulster) - onshore
+proj=longlat +a=6377340.189 +rf=299.3249646 +no_defs +type=crsMore about EPSG:4300 →
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 →