Convert Moorea 87 to WGS 84

Convert coordinates from Moorea 87 (EPSG:4691) to WGS 84 (EPSG:4326) — 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-4691-to-epsg-4326

Official EPSG transformation from Moorea 87 to WGS 84

The EPSG Geodetic Parameter Dataset defines 1 transformation between Moorea 87 (EPSG:4691) and WGS 84 (EPSG:4326). Its parameters, accuracy and area of use are listed below.

Moorea 87 to WGS 84 (2)

EPSG:8832±1 m

Method:: Position Vector transformation (geog2D domain)
Area of use:: French Polynesia - Society Islands - Moorea
Scope:: Geodesy.

Parameter	Value	Unit
X-axis translation(tx)	218.769	metre
Y-axis translation(ty)	150.75	metre
Z-axis translation(tz)	176.75	metre
X-axis rotation(rx)	3.5231	arc-second
Y-axis rotation(ry)	2.0037	arc-second
Z-axis rotation(rz)	1.288	arc-second
Scale difference(ds)	10.9817	parts per million

Concatenation of Moorea 87 to RGPF (2) and RGPF to WGS 84 (1) (CT codes 8831 and 8828).

Convert EPSG:4691 to EPSG:4326 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4691", "EPSG:4326", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4691 — Moorea 87

geographic system using latitude and longitude on an ellipsoid · Area of use: French Polynesia - Society Islands - Moorea

+proj=longlat +ellps=intl +towgs84=218.769,150.75,176.75,3.5231,2.0037,1.288,10.9817 +no_defs +type=crs

More about EPSG:4691 →

Target: EPSG:4326 — WGS 84

geographic system using latitude and longitude on an ellipsoid · Area of use: World (by country)

+proj=longlat +datum=WGS84 +no_defs +type=crs

More about EPSG:4326 →

Frequently asked questions

How accurate is converting Moorea 87 to WGS 84?: 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:4326 to EPSG:4691 →