Convert ITRF91 to ITRF92

Convert coordinates from ITRF91 (EPSG:4913) to ITRF92 (EPSG:4914) — 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-4914

Official EPSG transformations from ITRF91 to ITRF92

The EPSG Geodetic Parameter Dataset defines 2 transformations between ITRF91 (EPSG:4913) and ITRF92 (EPSG:4914). Each applies to a specific area — pick the one whose area of use covers your data.

ITRF91 to ITRF92 (1)

EPSG:9023±0.005 mBest accuracy

Method:: Position Vector transformation (geocentric domain)
Area of use:: World
Scope:: Geodesy.

Parameter	Value	Unit
X-axis translation(tx)	-1.1	centimetre
Y-axis translation(ty)	-1.4	centimetre
Z-axis translation(tz)	0.6	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)	-1.4	parts per billion

Scale difference in ppb and scale difference rate in ppb/yr where 1/billion = 1E-9 or nm/m. Superseded by parameter values derived from transformations to ITRF2020 (change in tX), see EPSG:10142.

ITRF91 to ITRF92 (2)

EPSG:10142±0.005 m

Method:: Position Vector transformation (geocentric domain)
Area of use:: World
Scope:: Geodesy.

Parameter	Value	Unit
X-axis translation(tx)	-1.2	centimetre
Y-axis translation(ty)	-1.4	centimetre
Z-axis translation(tz)	0.6	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)	-1.4	parts per billion

Parameter values derived from differences in CTs to ITRF2020 (codes 9999 and 10100). These supersede all values published in past IERS/ITRF documentation (CT code 9023). Scale difference in ppb and scale difference rate in ppb/yr where 1/billion = 1E-9.

Convert EPSG:4913 to EPSG:4914 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4913", "EPSG:4914", 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:4914 — ITRF92

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

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

More about EPSG:4914 →

Frequently asked questions

How accurate is converting ITRF91 to ITRF92?: The most accurate official EPSG transformation between these systems is accurate to about ±0.005 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:4914 to EPSG:4913 →