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Convert NAD83(CSRS)v4 to NAD83(CSRS)v6

Convert coordinates from NAD83(CSRS)v4 (EPSG:8244) to NAD83(CSRS)v6 (EPSG:8251) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

Direct link to this transformation: epsgtransform.com/transform/epsg-8244-to-epsg-8251

Official EPSG transformations from NAD83(CSRS)v4 to NAD83(CSRS)v6

The EPSG Geodetic Parameter Dataset defines 3 transformations between NAD83(CSRS)v4 (EPSG:8244) and NAD83(CSRS)v6 (EPSG:8251). Each applies to a specific area — pick the one whose area of use covers your data.

NAD83(CSRS)v4 to NAD83(CSRS)v6 (3)

EPSG:10537±0.02 mBest accuracy
Method:
Geographic3D Offset using NEU velocity grid (NTv2_Vel)
Area of use:
Canada - onshore
Scope:
Spatial referencing.

Grid file: NAD83v70VG.gvb

Replaces NAD83(CSRS)v4 to NAD83(CSRS)v6 (2) (code 10536). Replaced by NAD83(CSRS)v4 to NAD83(CSRS)v6 (4) (code 10716).

NAD83(CSRS)v4 to NAD83(CSRS)v6 (4)

EPSG:10716±0.02 m
Method:
Geographic3D Offset using NEU velocity grid (NTv2_Vel)
Area of use:
Canada - onshore
Scope:
Spatial referencing.

Grid file: NAD83v80VG.gvb

Replaces NAD83(CSRS)v4 to NAD83(CSRS)v6 (3) (code 10537).

NAD83(CSRS)v4 to NAD83(CSRS)v6 (2)

EPSG:10536±0.025 m
Method:
Geographic3D Offset using NEU velocity grid (NTv2_Vel)
Area of use:
Canada - onshore south of 60°N
Scope:
Change of coordinate epoch in 3-dimensions (φλh).

Grid file: NAD83v6VG.gvb

The v6 velocity grid is not recommended for height transformation north of 60°N due to due to inaccuracies in the vertical component of the velocity model. Replaced by NAD83(CSRS)v4 to NAD83(CSRS)v6 (3) (code 10537).

Convert EPSG:8244 to EPSG:8251 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:8244", "EPSG:8251", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:8244 — NAD83(CSRS)v4

geographic system using latitude, longitude and ellipsoidal height · Area of use: Canada

+proj=longlat +ellps=GRS80 +no_defs +type=crs
More about EPSG:8244 →

Target: EPSG:8251 — NAD83(CSRS)v6

geographic system using latitude, longitude and ellipsoidal height · Area of use: Canada

+proj=longlat +ellps=GRS80 +no_defs +type=crs
More about EPSG:8251 →

Frequently asked questions

How accurate is converting NAD83(CSRS)v4 to NAD83(CSRS)v6?
The most accurate official EPSG transformation between these systems is accurate to about ±0.02 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:8251 to EPSG:8244 →