Convert Moorea 87 to RGPF

Convert coordinates from Moorea 87 (EPSG:4691) to RGPF (EPSG:4687) — 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-4687

Official EPSG transformation from Moorea 87 to RGPF

The EPSG Geodetic Parameter Dataset defines 1 transformation between Moorea 87 (EPSG:4691) and RGPF (EPSG:4687). Its parameters, accuracy and area of use are listed below.

Moorea 87 to RGPF (2)

EPSG:8831±0.5 m

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

Parameter	Value	Unit
X-axis translation(tx)	218.697	metre
Y-axis translation(ty)	151.257	metre
Z-axis translation(tz)	176.995	metre
X-axis rotation(rx)	3.5048	arc-second
Y-axis rotation(ry)	2.004	arc-second
Z-axis rotation(rz)	1.281	arc-second
Scale difference(ds)	10.991	parts per million

Recalculated in 2009 using corrected coordinates of deriving stations.

Convert EPSG:4691 to EPSG:4687 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4691", "EPSG:4687", 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:4687 — RGPF

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

+proj=longlat +ellps=GRS80 +no_defs +type=crs

More about EPSG:4687 →

Frequently asked questions

How accurate is converting Moorea 87 to RGPF?: The most accurate official EPSG transformation between these systems is accurate to about ±0.5 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:4687 to EPSG:4691 →