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Convert NTF to RGF93 v2

Convert coordinates from NTF (EPSG:4275) to RGF93 v2 (EPSG:9777) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

Direct link to this transformation: epsgtransform.com/transform/epsg-4275-to-epsg-9777

Official EPSG transformation from NTF to RGF93 v2

The EPSG Geodetic Parameter Dataset defines 1 transformation between NTF (EPSG:4275) and RGF93 v2 (EPSG:9777). Its parameters, accuracy and area of use are listed below.

NTF to RGF93 v2 (1)

EPSG:9888±1 m
Method:
Geocentric translations (geog2D domain) by grid (IGN)
Area of use:
France - onshore - mainland and Corsica
Scope:
Transformation of coordinates at 1m level of accuracy.

Grid file: gr3df97a.txt

Parameter file is from NTF to RGF93 v1 (code 9327), assuming that RGF93 v1 is equivalent to RGF93 v2 within the accuracy of the transformation. May be emulated using NTv2 method - see CT code 9890.

Convert EPSG:4275 to EPSG:9777 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4275", "EPSG:9777", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4275 — NTF

geographic system using latitude and longitude on an ellipsoid · Area of use: France - onshore - mainland and Corsica

+proj=longlat +ellps=clrk80ign +towgs84=-168,-60,320,0,0,0,0 +no_defs +type=crs
More about EPSG:4275 →

Target: EPSG:9777 — RGF93 v2

geographic system using latitude and longitude on an ellipsoid · Area of use: France

+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs +type=crs
More about EPSG:9777 →

Frequently asked questions

How accurate is converting NTF to RGF93 v2?
The most accurate official EPSG transformation between these systems is accurate to about ±1 m within its stated area of use. Browser-based converters approximate datum shifts with Helmert parameters; for surveying-grade work apply the official transformation (including the grid-shift files listed below) in a desktop GIS.
Does my data leave the browser when I use this converter?
No. All coordinate transformations are computed locally in your browser using proj4js. The coordinates you enter are never transmitted to any server.
Need the reverse? Convert EPSG:9777 to EPSG:4275 →