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Convert ATS77 to NAD83(CSRS)v3

Convert coordinates from ATS77 (EPSG:4122) to NAD83(CSRS)v3 (EPSG:8240) — 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-8240

Official EPSG transformation from ATS77 to NAD83(CSRS)v3

The EPSG Geodetic Parameter Dataset defines 1 transformation between ATS77 (EPSG:4122) and NAD83(CSRS)v3 (EPSG:8240). Its parameters, accuracy and area of use are listed below.

ATS77 to NAD83(CSRS)v3 (3)

EPSG:9235±1.5 m
Method:
NTv2
Area of use:
Canada - Nova Scotia
Scope:
Transformation of coordinates at 1m to 2m level of accuracy.

Grid file: NS778301.gsb

Can be taken as an approximate transformation ATS77 to WGS 84 - see code 1851. Replaced by ATS77 to NAD83(CSRS)v6 (4) (transformation code 9106).

Convert EPSG:4122 to EPSG:8240 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4122", "EPSG:8240", 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:8240 — NAD83(CSRS)v3

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

+proj=longlat +ellps=GRS80 +no_defs +type=crs
More about EPSG:8240 →

Frequently asked questions

How accurate is converting ATS77 to NAD83(CSRS)v3?
The most accurate official EPSG transformation between these systems is accurate to about ±1.5 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:8240 to EPSG:4122 →