Convert CSG67 to RGFG95

Convert coordinates from CSG67 (EPSG:4623) to RGFG95 (EPSG:4624) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

From

Input (lon, lat (decimal degrees))

Output (lon, lat (decimal degrees))

Direct link to this transformation: epsgtransform.com/transform/epsg-4623-to-epsg-4624

Official EPSG transformation from CSG67 to RGFG95

The EPSG Geodetic Parameter Dataset defines 1 transformation between CSG67 (EPSG:4623) and RGFG95 (EPSG:4624). Its parameters, accuracy and area of use are listed below.

CSG67 to RGFG95 (1)

EPSG:1908±1 m

Method:: Position Vector transformation (geog2D domain)
Area of use:: French Guiana - coastal area
Scope:: Transformation of coordinates at 1m level of accuracy.

Parameter	Value	Unit
X-axis translation(tx)	-193.066	metre
Y-axis translation(ty)	236.993	metre
Z-axis translation(tz)	105.447	metre
X-axis rotation(rx)	0.4814	arc-second
Y-axis rotation(ry)	-0.8074	arc-second
Z-axis rotation(rz)	0.1276	arc-second
Scale difference(ds)	1.5649	parts per million

Accuracy better than +/- 0.1 metre in the coastal area, better than +/- 1 metre in the interior.

Convert EPSG:4623 to EPSG:4624 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4623", "EPSG:4624", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4623 — CSG67

geographic system using latitude and longitude on an ellipsoid · Area of use: French Guiana - coastal area

+proj=longlat +ellps=intl +towgs84=-186,230,110,0,0,0,0 +no_defs +type=crs

More about EPSG:4623 →

Target: EPSG:4624 — RGFG95

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

+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs +type=crs

More about EPSG:4624 →

Frequently asked questions

How accurate is converting CSG67 to RGFG95?: 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 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:4624 to EPSG:4623 →