NTF (Paris) to NTF (1)
EPSG:1763±0 mBest accuracy- Method:
- Longitude rotation
- Area of use:
- France - onshore - mainland and Corsica
- Scope:
- Change of prime meridian.
| Parameter | Value | Unit |
|---|---|---|
| Longitude offset | 2.5969213 | grad |
Convert NTF (Paris) to NTF
Convert coordinates from NTF (Paris) (EPSG:4807) to NTF (EPSG:4275) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.
Official EPSG transformations from NTF (Paris) to NTF
The EPSG Geodetic Parameter Dataset defines 2 transformations between NTF (Paris) (EPSG:4807) and NTF (EPSG:4275). Each applies to a specific area — pick the one whose area of use covers your data.
NTF (Paris) to NTF (2)
EPSG:1764±0 m- Method:
- Longitude rotation
- Area of use:
- France - onshore - mainland and Corsica
- Scope:
- Change of prime meridian.
| Parameter | Value | Unit |
|---|---|---|
| Longitude offset | 2.201395 | sexagesimal DMS |
OGP prefers value from IGN Paris (code 1763).
Convert EPSG:4807 to EPSG:4275 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4807", "EPSG:4275", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Source: EPSG:4807 — NTF (Paris)
geographic system using latitude and longitude on an ellipsoid · Area of use: France - onshore - mainland and Corsica
+proj=longlat +ellps=clrk80ign +pm=paris +towgs84=-168,-60,320,0,0,0,0 +no_defs +type=crsMore about EPSG:4807 →
Target: 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=crsMore about EPSG:4275 →
Frequently asked questions
- How accurate is converting NTF (Paris) to NTF?
- The most accurate official EPSG transformation between these systems is accurate to about ±0 m within its stated area of use. Browser-based converters approximate datum shifts with Helmert parameters; for surveying-grade work apply the official transformation 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.