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Convert RRAF 1991 to RRAF 1991 + IGN 2008 LD height

Convert coordinates from RRAF 1991 (EPSG:4557) to RRAF 1991 + IGN 2008 LD height (EPSG:9542) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

Direct link to this transformation: epsgtransform.com/transform/epsg-4557-to-epsg-9542

Official EPSG transformation from RRAF 1991 to RRAF 1991 + IGN 2008 LD height

The EPSG Geodetic Parameter Dataset defines 1 transformation between RRAF 1991 (EPSG:4557) and RRAF 1991 + IGN 2008 LD height (EPSG:9542). Its parameters, accuracy and area of use are listed below.

RRAF 1991 to RRAF 1991 + IGN 2008 LD height (1)

EPSG:9642±0.2 m
Method:
Geog3D to Geog2D+GravityRelatedHeight (IGN2009)
Area of use:
Guadeloupe - La Desirade - onshore
Scope:
Reversible geoid model transformation.

Grid file: RALDW842016.mnt

Reversible alternative to RRAF 1991 to IGN 2008 LD height (1) (code 9132).

Convert EPSG:4557 to EPSG:9542 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4557", "EPSG:9542", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4557 — RRAF 1991

geographic system using latitude, longitude and ellipsoidal height · 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:4557 →

Target: EPSG:9542 — RRAF 1991 + IGN 2008 LD height

compound horizontal + vertical reference system · Area of use: Guadeloupe - La Desirade - onshore

+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +vunits=m +no_defs +type=crs
More about EPSG:9542 →

Frequently asked questions

How accurate is converting RRAF 1991 to RRAF 1991 + IGN 2008 LD height?
The most accurate official EPSG transformation between these systems is accurate to about ±0.2 m within its stated area of use. Browser-based converters approximate datum shifts with Helmert parameters; for surveying-grade work apply the official transformation (including the grid-shift files listed below) 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:9542 to EPSG:4557 →