Convert coordinates from IGN72 Grande Terre (EPSG:4662) 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 5 transformations between IGN72 Grande Terre (EPSG:4662) and RGNC91-93 (EPSG:4749). Each applies to a specific area — pick the one whose area of use covers your data.
Grid file: gr3dnc02b.mnt
Developed in July 2002 and officially adopted in August 2005.
Grid file: gr3dnc01b.mnt
Developed in July 2002 and officially adopted in August 2005. May be emulated using NTv2 method - see RGNC91-93 to IGN72 Grande Terre (6) (code 15962).
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | 48.812 | metre |
| Y-axis translation(ty) | -205.932 | metre |
| Z-axis translation(tz) | 343.993 | metre |
| X-axis rotation(rx) | 3.4427 | arc-second |
| Y-axis rotation(ry) | 0.4999 | arc-second |
| Z-axis rotation(rz) | -4.0878 | arc-second |
| Scale difference(ds) | 6.5215 | parts per million |
Determined in July 2000
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | 97.297 | metre |
| Y-axis translation(ty) | -263.243 | metre |
| Z-axis translation(tz) | 310.879 | metre |
| X-axis rotation(rx) | 1.5999 | arc-second |
| Y-axis rotation(ry) | -0.8387 | arc-second |
| Z-axis rotation(rz) | -3.1409 | arc-second |
| Scale difference(ds) | 13.326 | parts per million |
Determined in April 1993.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -11.64 | metre |
| Y-axis translation(ty) | -348.6 | metre |
| Z-axis translation(tz) | 291.98 | metre |
Determined in May 2001. May be taken as approximate transformation to WGS 84 - see IGN72 Grande Terre to WGS 84 (3) (code 15903).
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4662", "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
+proj=longlat +ellps=intl +towgs84=-11.64,-348.6,291.98,0,0,0,0 +no_defs +type=crsMore about EPSG:4662 →
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 →