Convert coordinates from RD/83 (EPSG:4745) 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 RD/83 (EPSG:4745) and ETRS89 (EPSG:4258). Each applies to a specific area — pick the one whose area of use covers your data.
Grid file: NTv2_SN.gsb
Recommended by Saxony State Spatial Data and Land Survey Corporation for transformations based on official geospatial data of Saxony. Accuracy 3mm within Saxony; within the rest of RD/83 definition area results at least coincide with EPSG CT code15868.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | 612.4 | metre |
| Y-axis translation(ty) | 77 | metre |
| Z-axis translation(tz) | 440.2 | metre |
| X-axis rotation(rx) | -0.054 | arc-second |
| Y-axis rotation(ry) | 0.057 | arc-second |
| Z-axis rotation(rz) | -2.797 | arc-second |
| Scale difference(ds) | 2.55 | parts per million |
Derived in 2001 at 31 points of the German GPS Network DREF in former East Germany. Although for high accuracy limited to Saxony, may be taken as approximate transformation between DHDN and WGS 84 for all former East German states - see code 15869.
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4745", "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: Germany - Saxony
+proj=longlat +ellps=bessel +no_defs +type=crsMore about EPSG:4745 →
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 →