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Convert ATS77 to NAD83

Convert coordinates from ATS77 (EPSG:4122) to NAD83 (EPSG:4269) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

Direct link to this transformation: epsgtransform.com/transform/epsg-4122-to-epsg-4269

Official EPSG transformation from ATS77 to NAD83

The EPSG Geodetic Parameter Dataset defines 1 transformation between ATS77 (EPSG:4122) and NAD83 (EPSG:4269). Its parameters, accuracy and area of use are listed below.

ATS77 to NAD83 (1)

EPSG:9105±0.5 m
Method:
NTv2
Area of use:
Canada - Nova Scotia
Scope:
Geodesy.

Grid file: GS7783.GSB

Convert EPSG:4122 to EPSG:4269 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4122", "EPSG:4269", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4122 — ATS77

geographic system using latitude and longitude on an ellipsoid · Area of use: Canada - Maritime Provinces

+proj=longlat +a=6378135 +rf=298.257 +no_defs +type=crs
More about EPSG:4122 →

Target: EPSG:4269 — NAD83

geographic system using latitude and longitude on an ellipsoid · Area of use: North America - NAD83

+proj=longlat +datum=NAD83 +no_defs +type=crs
More about EPSG:4269 →

Frequently asked questions

How accurate is converting ATS77 to NAD83?
The most accurate official EPSG transformation between these systems is accurate to about ±0.5 m within its stated area of use. Browser-based converters approximate datum shifts with Helmert parameters; for surveying-grade work apply the official transformation (including the grid-shift files listed below) 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:4269 to EPSG:4122 →