Convert coordinates from Tahiti 79 (EPSG:4690) to RGPF (EPSG:4687) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.
The EPSG Geodetic Parameter Dataset defines 1 transformation between Tahiti 79 (EPSG:4690) and RGPF (EPSG:4687). Its parameters, accuracy and area of use are listed below.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | 221.525 | metre |
| Y-axis translation(ty) | 152.948 | metre |
| Z-axis translation(tz) | 176.768 | metre |
| X-axis rotation(rx) | 2.3847 | arc-second |
| Y-axis rotation(ry) | 1.3896 | arc-second |
| Z-axis rotation(rz) | 0.877 | arc-second |
| Scale difference(ds) | 11.4741 | parts per million |
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4690", "EPSG:4687", 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: French Polynesia - Society Islands - Tahiti
+proj=longlat +ellps=intl +towgs84=221.597,152.441,176.523,2.403,1.3893,0.884,11.4648 +no_defs +type=crsMore about EPSG:4690 →
geographic system using latitude and longitude on an ellipsoid · Area of use: French Polynesia
+proj=longlat +ellps=GRS80 +no_defs +type=crsMore about EPSG:4687 →