Convert ITRF97 to GDA94

Convert coordinates from ITRF97 (EPSG:4918) to GDA94 (EPSG:4938) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

From

Input (x, y)

Output (x, y)

Direct link to this transformation: epsgtransform.com/transform/epsg-4918-to-epsg-4938

Official EPSG transformations from ITRF97 to GDA94

The EPSG Geodetic Parameter Dataset defines 2 transformations between ITRF97 (EPSG:4918) and GDA94 (EPSG:4938). Each applies to a specific area — pick the one whose area of use covers your data.

ITRF97 to GDA94 (1)

EPSG:6392±0.1 mBest accuracy

Method:: Time-dependent Coordinate Frame rotation (geocen)
Area of use:: Australia - onshore and EEZ
Scope:: Geodesy.

Parameter	Value	Unit
X-axis translation(tx)	-0.2088	metre
Y-axis translation(ty)	0.0119	metre
Z-axis translation(tz)	0.1855	metre
X-axis rotation(rx)	0.012059	arc-second
Y-axis rotation(ry)	0.013639	arc-second
Z-axis rotation(rz)	0.011825	arc-second
Scale difference(ds)	0.004559	parts per million
rate tx	-0.022	metres per year
rate ty	0.0049	metres per year
rate tz	0.0169	metres per year
rate rx	0.00204	arc-seconds per year
rate ry	0.001782	arc-seconds per year
rate rz	0.001697	arc-seconds per year
rate ds	-0.00109	parts per million per year
epoch	2000	year

Replaced by Dawson and Woods transformation of 2010, tfm code 6279.

ITRF97 to GDA94 (2)

EPSG:6279±0.18 m

Method:: Time-dependent Coordinate Frame rotation (geocen)
Area of use:: Australia - onshore and EEZ
Scope:: Geodesy.

Parameter	Value	Unit
X-axis translation(tx)	-14.63	millimetre
Y-axis translation(ty)	-27.62	millimetre
Z-axis translation(tz)	-25.32	millimetre
X-axis rotation(rx)	-1.7893	milliarc-second
Y-axis rotation(ry)	-0.6047	milliarc-second
Z-axis rotation(rz)	0.9962	milliarc-second
Scale difference(ds)	6.695	parts per billion
rate tx	-8.6	millimetres per year
rate ty	0.36	millimetres per year
rate tz	11.25	millimetres per year
rate rx	1.6394	milliarc-seconds per year
rate ry	1.5198	milliarc-seconds per year
rate rz	1.3801	milliarc-seconds per year
rate ds	0.007	parts per billion per year
epoch	1994	year

RMS residuals 26mm N, 12mm E and 179mm up, maximum residuals 49mm N, 24mm E and 464mm up. Scale difference in ppb and scale difference rate in ppb/yr where 1/billion = 1E-9 or nm/m. Replaces 2001 transformation by Dawson and Steed, tfm code 6392.

Convert EPSG:4918 to EPSG:4938 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4918", "EPSG:4938", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4918 — ITRF97

geocentric Cartesian system (Earth-centred Earth-fixed) · Area of use: World

+proj=geocent +ellps=GRS80 +units=m +no_defs +type=crs

More about EPSG:4918 →

Target: EPSG:4938 — GDA94

geocentric Cartesian system (Earth-centred Earth-fixed) · Area of use: Australia - GDA

+proj=geocent +ellps=GRS80 +units=m +no_defs +type=crs

More about EPSG:4938 →

Frequently asked questions

How accurate is converting ITRF97 to GDA94?: 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:4938 to EPSG:4918 →