Convert ITRF97 to NAD83(CORS96)

Convert coordinates from ITRF97 (EPSG:4918) to NAD83(CORS96) (EPSG:6781) — 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-6781

Official EPSG transformation from ITRF97 to NAD83(CORS96)

The EPSG Geodetic Parameter Dataset defines 1 transformation between ITRF97 (EPSG:4918) and NAD83(CORS96) (EPSG:6781). Its parameters, accuracy and area of use are listed below.

ITRF97 to NAD83(CORS96) (1)

EPSG:6865±0 m

Method:: Time-dependent Coordinate Frame rotation (geocen)
Area of use:: USA - CONUS and Alaska; PRVI
Scope:: Geodesy. Defines NAD83(CORS96) from January 2000 through December 2001.

Parameter	Value	Unit
X-axis translation(tx)	0.9889	metre
Y-axis translation(ty)	-1.9074	metre
Z-axis translation(tz)	-0.503	metre
X-axis rotation(rx)	25.915	milliarc-second
Y-axis rotation(ry)	9.426	milliarc-second
Z-axis rotation(rz)	11.599	milliarc-second
Scale difference(ds)	-0.93	parts per billion
rate tx	0.0007	metres per year
rate ty	-0.0001	metres per year
rate tz	0.0019	metres per year
rate rx	0.067	milliarc-seconds per year
rate ry	-0.757	milliarc-seconds per year
rate rz	-0.031	milliarc-seconds per year
rate ds	-0.19	parts per billion per year
epoch	1997	year

Scale difference in ppb and scale difference rate in ppb/yr where 1/billion = 1E-9 or nm/m. 1996 derivation (see CT 6864) concatenated with IGS value of ITRF96>ITRF97. Replaced by CT code 6866 from 2002-01-01. See CT code 8260 for Canadian equivalent.

Convert EPSG:4918 to EPSG:6781 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4918", "EPSG:6781", 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:6781 — NAD83(CORS96)

geocentric Cartesian system (Earth-centred Earth-fixed) · Area of use: USA - CONUS and Alaska; PRVI

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

More about EPSG:6781 →

Frequently asked questions

How accurate is converting ITRF97 to NAD83(CORS96)?: 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:6781 to EPSG:4918 →