Convert RRAF 1991 to RGAF09

Convert coordinates from RRAF 1991 (EPSG:4558) to RGAF09 (EPSG:5489) — 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-4558-to-epsg-5489

Official EPSG transformations from RRAF 1991 to RGAF09

The EPSG Geodetic Parameter Dataset defines 3 transformations between RRAF 1991 (EPSG:4558) and RGAF09 (EPSG:5489). Each applies to a specific area — pick the one whose area of use covers your data.

RRAF 1991 to RGAF09 (1)

EPSG:5494±0.1 mBest accuracy

Method:: Position Vector transformation (geog2D domain)
Area of use:: Martinique
Scope:: Transformation of coordinates at 0.1m level of accuracy.

Parameter	Value	Unit
X-axis translation(tx)	0.7696	metre
Y-axis translation(ty)	-0.8692	metre
Z-axis translation(tz)	-12.0631	metre
X-axis rotation(rx)	-0.32511	arc-second
Y-axis rotation(ry)	-0.21041	arc-second
Z-axis rotation(rz)	-0.0239	arc-second
Scale difference(ds)	0.2829	parts per million

RRAF 1991 to RGAF09 (2)

EPSG:5495±0.1 m

Method:: Position Vector transformation (geog2D domain)
Area of use:: Guadeloupe - Grande-Terre and surrounding islands - onshore
Scope:: Transformation of coordinates at 0.1m level of accuracy.

Parameter	Value	Unit
X-axis translation(tx)	1.2239	metre
Y-axis translation(ty)	2.4156	metre
Z-axis translation(tz)	-1.7598	metre
X-axis rotation(rx)	0.038	arc-second
Y-axis rotation(ry)	-0.16101	arc-second
Z-axis rotation(rz)	-0.04925	arc-second
Scale difference(ds)	0.2387	parts per million

RRAF 1991 to RGAF09 (3)

EPSG:5496±0.1 m

Method:: Position Vector transformation (geog2D domain)
Area of use:: Guadeloupe - St Martin and St Barthelemy - onshore
Scope:: Transformation of coordinates at 0.1m level of accuracy.

Parameter	Value	Unit
X-axis translation(tx)	14.6642	metre
Y-axis translation(ty)	5.2493	metre
Z-axis translation(tz)	0.1981	metre
X-axis rotation(rx)	-0.06838	arc-second
Y-axis rotation(ry)	0.09141	arc-second
Z-axis rotation(rz)	-0.58131	arc-second
Scale difference(ds)	-0.4067	parts per million

Convert EPSG:4558 to EPSG:5489 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4558", "EPSG:5489", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4558 — RRAF 1991

geographic system using latitude and longitude on an ellipsoid · Area of use: Caribbean - French Antilles

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

More about EPSG:4558 →

Target: EPSG:5489 — RGAF09

geographic system using latitude and longitude on an ellipsoid · Area of use: Caribbean - French Antilles

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

More about EPSG:5489 →

Frequently asked questions

How accurate is converting RRAF 1991 to RGAF09?: The most accurate official EPSG transformation between these systems is accurate to about ±0.1 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:5489 to EPSG:4558 →