Convert coordinates from IGN72 Nuku Hiva (EPSG:4630) 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 3 transformations between IGN72 Nuku Hiva (EPSG:4630) and RGPF (EPSG:4687). Each applies to a specific area — pick the one whose area of use covers your data.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | 165.732 | metre |
| Y-axis translation(ty) | 216.72 | metre |
| Z-axis translation(tz) | 180.505 | metre |
| X-axis rotation(rx) | -0.6434 | arc-second |
| Y-axis rotation(ry) | -0.4512 | arc-second |
| Z-axis rotation(rz) | -0.0791 | arc-second |
| Scale difference(ds) | 7.4204 | parts per million |
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | 259.551 | metre |
| Y-axis translation(ty) | 297.612 | metre |
| Z-axis translation(tz) | 197.833 | metre |
| X-axis rotation(rx) | 1.4866 | arc-second |
| Y-axis rotation(ry) | 2.1224 | arc-second |
| Z-axis rotation(rz) | 0.4612 | arc-second |
| Scale difference(ds) | 27.0249 | parts per million |
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | 1363.785 | metre |
| Y-axis translation(ty) | 1362.687 | metre |
| Z-axis translation(tz) | 398.811 | metre |
| X-axis rotation(rx) | -4.5322 | arc-second |
| Y-axis rotation(ry) | -6.7579 | arc-second |
| Z-axis rotation(rz) | -1.0574 | arc-second |
| Scale difference(ds) | 268.361 | parts per million |
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4630", "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 - Marquesas Islands - Nuku Hiva, Ua Huka and Ua Pou
+proj=longlat +ellps=intl +towgs84=84,274,65,0,0,0,0 +no_defs +type=crsMore about EPSG:4630 →
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 →