Convert ITRF91 to ETRF2000

Convert coordinates from ITRF91 (EPSG:4913) to ETRF2000 (EPSG:7930) — 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-7930

Official EPSG transformation from ITRF91 to ETRF2000

The EPSG Geodetic Parameter Dataset defines 1 transformation between ITRF91 (EPSG:4913) and ETRF2000 (EPSG:7930). Its parameters, accuracy and area of use are listed below.

ITRF91 to ETRF2000 (1)

EPSG:7944±0 m

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

Parameter	Value	Unit
X-axis translation(tx)	27.3	millimetre
Y-axis translation(ty)	30.7	millimetre
Z-axis translation(tz)	-11.3	millimetre
X-axis rotation(rx)	0.891	milliarc-second
Y-axis rotation(ry)	5.39	milliarc-second
Z-axis rotation(rz)	-8.772	milliarc-second
Scale difference(ds)	-2.27	parts per billion
rate tx	0	millimetres per year
rate ty	0.6	millimetres per year
rate tz	1.4	millimetres per year
rate rx	0.081	milliarc-seconds per year
rate ry	0.49	milliarc-seconds per year
rate rz	-0.812	milliarc-seconds per year
rate ds	-0.01	parts per billion per year
epoch	2000	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:7930 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4913", "EPSG:7930", 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:7930 — ETRF2000

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

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

More about EPSG:7930 →

Frequently asked questions

How accurate is converting ITRF91 to ETRF2000?: 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:7930 to EPSG:4913 →