Convert ITRF91 to ETRF2014

Convert coordinates from ITRF91 (EPSG:4913) to ETRF2014 (EPSG:8401) — 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-4913-to-epsg-8401

Official EPSG transformation from ITRF91 to ETRF2014

The EPSG Geodetic Parameter Dataset defines 1 transformation between ITRF91 (EPSG:4913) and ETRF2014 (EPSG:8401). Its parameters, accuracy and area of use are listed below.

ITRF91 to ETRF2014 (1)

EPSG:8877±0 m

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

Parameter	Value	Unit
X-axis translation(tx)	-27.4	millimetre
Y-axis translation(ty)	-15.5	millimetre
Z-axis translation(tz)	76.8	millimetre
X-axis rotation(rx)	1.785	milliarc-second
Y-axis rotation(ry)	11.151	milliarc-second
Z-axis rotation(rz)	-16.43	milliarc-second
Scale difference(ds)	-4.49	parts per billion
rate tx	-0.1	millimetres per year
rate ty	0.5	millimetres per year
rate tz	3.3	millimetres per year
rate rx	0.085	milliarc-seconds per year
rate ry	0.531	milliarc-seconds per year
rate rz	-0.79	milliarc-seconds per year
rate ds	-0.12	parts per billion per year
epoch	2010	year

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

Convert EPSG:4913 to EPSG:8401 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4913", "EPSG:8401", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4913 — ITRF91

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

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

More about EPSG:4913 →

Target: EPSG:8401 — ETRF2014

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:8401 →

Frequently asked questions

How accurate is converting ITRF91 to ETRF2014?: 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:8401 to EPSG:4913 →