Convert coordinates from NEA74 Noumea (EPSG:4644) to RGNC91-93 (EPSG:4749) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.
The EPSG Geodetic Parameter Dataset defines 3 transformations between NEA74 Noumea (EPSG:4644) and RGNC91-93 (EPSG:4749). Each applies to a specific area — pick the one whose area of use covers your data.
Grid file: gr3dnc03a.mnt
Developed in July 2002 and officially adopted in August 2005. May be emulated using NTv2 method - see RGNC91-93 to NEA74 Noumea (4) (code 1295).
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -166.0684 | metre |
| Y-axis translation(ty) | -154.7826 | metre |
| Z-axis translation(tz) | 254.8282 | metre |
| X-axis rotation(rx) | 37.546 | arc-second |
| Y-axis rotation(ry) | -7.7018 | arc-second |
| Z-axis rotation(rz) | 10.2029 | arc-second |
| Scale difference(ds) | -30.84 | parts per million |
Determined in May 2001
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -10.18 | metre |
| Y-axis translation(ty) | -350.43 | metre |
| Z-axis translation(tz) | 291.37 | metre |
Determined in July 2000. May be taken as approximate transformation to WGS 84 - see NEA74 Noumea to WGS 84 (3) (code 15904).
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4644", "EPSG:4749", 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: New Caledonia - Grande Terre - Noumea
+proj=longlat +ellps=intl +towgs84=-10.18,-350.43,291.37,0,0,0,0 +no_defs +type=crsMore about EPSG:4644 →
geographic system using latitude and longitude on an ellipsoid · Area of use: New Caledonia
+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs +type=crsMore about EPSG:4749 →