Convert RGR92 to Reunion 1947

Convert coordinates from RGR92 (EPSG:4627) to Reunion 1947 (EPSG:4626) — 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-4627-to-epsg-4626

Official EPSG transformation from RGR92 to Reunion 1947

The EPSG Geodetic Parameter Dataset defines 1 transformation between RGR92 (EPSG:4627) and Reunion 1947 (EPSG:4626). Its parameters, accuracy and area of use are listed below.

RGR92 to Reunion 1947 (1)

EPSG:1964±0.1 m

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

Parameter	Value	Unit
X-axis translation(tx)	-789.99	metre
Y-axis translation(ty)	627.333	metre
Z-axis translation(tz)	89.685	metre
X-axis rotation(rx)	-0.6072	arc-second
Y-axis rotation(ry)	-76.8019	arc-second
Z-axis rotation(rz)	10.568	arc-second
Scale difference(ds)	32.2083	parts per million

Note: Because of the large rotation about the Y-axis this transformation is not reversible. Errors of up to 0.5m may occur. For the reverse transformation use Reunion 1947 [alias Piton des Neiges] to RGR92 (1) (code 1926).

Convert EPSG:4627 to EPSG:4626 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4627", "EPSG:4626", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4627 — RGR92

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

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

More about EPSG:4627 →

Target: EPSG:4626 — Reunion 1947

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

+proj=longlat +ellps=intl +towgs84=94,-948,-1262,0,0,0,0 +no_defs +type=crs

More about EPSG:4626 →

Frequently asked questions

How accurate is converting RGR92 to Reunion 1947?: 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:4626 to EPSG:4627 →