Convert ITRF97 to ETRF97

Convert coordinates from ITRF97 (EPSG:4918) to ETRF97 (EPSG:7928) — 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-7928

Official EPSG transformation from ITRF97 to ETRF97

The EPSG Geodetic Parameter Dataset defines 1 transformation between ITRF97 (EPSG:4918) and ETRF97 (EPSG:7928). Its parameters, accuracy and area of use are listed below.

ITRF97 to ETRF97 (1)

EPSG:7939±0 m

Method:: Time-dependent Position Vector tfm (geocentric)
Area of use:: Europe - ETRF
Scope:: Geodesy. Defines ETRF97.

Parameter	Value	Unit
X-axis translation(tx)	4.1	centimetre
Y-axis translation(ty)	4.1	centimetre
Z-axis translation(tz)	-4.9	centimetre
X-axis rotation(rx)	0	milliarc-second
Y-axis rotation(ry)	0	milliarc-second
Z-axis rotation(rz)	0	milliarc-second
Scale difference(ds)	0	parts per billion
rate tx	0	centimetres per year
rate ty	0	centimetres per year
rate tz	0	centimetres per year
rate rx	0.2	milliarc-seconds per year
rate ry	0.5	milliarc-seconds per year
rate rz	-0.65	milliarc-seconds per year
rate ds	0	parts per billion per year
epoch	1989	year

Scale difference in ppb and scale difference rate in ppb/yr where 1/billion = 1E-9 or nm/m.

Convert EPSG:4918 to EPSG:7928 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4918", "EPSG:7928", 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:7928 — ETRF97

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

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

More about EPSG:7928 →

Frequently asked questions

How accurate is converting ITRF97 to ETRF97?: The most accurate official EPSG transformation between these systems is accurate to about ±0 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:7928 to EPSG:4918 →