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Convert RGF93 v2b to RGF93 v2b + NGF-IGN69 height

Convert coordinates from RGF93 v2b (EPSG:9781) to RGF93 v2b + NGF-IGN69 height (EPSG:9785) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

Direct link to this transformation: epsgtransform.com/transform/epsg-9781-to-epsg-9785

Official EPSG transformations from RGF93 v2b to RGF93 v2b + NGF-IGN69 height

The EPSG Geodetic Parameter Dataset defines 2 transformations between RGF93 v2b (EPSG:9781) and RGF93 v2b + NGF-IGN69 height (EPSG:9785). Each applies to a specific area — pick the one whose area of use covers your data.

RGF93 v2b to RGF93 v2b + NGF-IGN69 height (4)

EPSG:9787±0.01 mBest accuracy
Method:
Geog3D to Geog2D+GravityRelatedHeight (IGN2009)
Area of use:
France - mainland onshore
Scope:
Reversible geoid model transformation.

Grid file: RAF18b.mnt

Reversible alternative to RGF93 v2b to NGF-IGN69 height (4) (CT code 9786). Replaces RGF93 v2 to RGF93 v2 + NGF-IGN69 height (3) (CT code 9638).

RGF93 v2b to RGF93 v2b + NGF-IGN69 height (5)

EPSG:9877±0.01 m
Method:
Geog3D to Geog2D+GravityRelatedHeight (IGN2009)
Area of use:
France - mainland onshore
Scope:
Reversible geoid model transformation.

Grid file: RAF20.tac

Reversible alternative to RGF93 v2b to NGF-IGN69 height (5) (CT code 9876). Replaces RGF93 v2b to RGF93 v2b + NGF-IGN69 height (4) (CT code 9787).

Convert EPSG:9781 to EPSG:9785 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:9781", "EPSG:9785", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:9781 — RGF93 v2b

geographic system using latitude, longitude and ellipsoidal height · Area of use: France

+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs +type=crs
More about EPSG:9781 →

Target: EPSG:9785 — RGF93 v2b + NGF-IGN69 height

compound horizontal + vertical reference system · Area of use: France - mainland onshore

+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +vunits=m +no_defs +type=crs
More about EPSG:9785 →

Frequently asked questions

How accurate is converting RGF93 v2b to RGF93 v2b + NGF-IGN69 height?
The most accurate official EPSG transformation between these systems is accurate to about ±0.01 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:9785 to EPSG:9781 →