NAD27(76) to NAD83(CSRS)v3 (1)
EPSG:9109±1 m- Method:
- NTv2
- Area of use:
- Canada - Ontario
- Scope:
- Geodesy.
Grid file: ON76CSv1.GSB
Derived through NAD83(CSRS)v3 but within accuracy of transformation may be assumed to apply to any version.
Convert NAD27(76) to NAD83(CSRS)v3
Convert coordinates from NAD27(76) (EPSG:4608) to NAD83(CSRS)v3 (EPSG:8240) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.
Official EPSG transformation from NAD27(76) to NAD83(CSRS)v3
The EPSG Geodetic Parameter Dataset defines 1 transformation between NAD27(76) (EPSG:4608) and NAD83(CSRS)v3 (EPSG:8240). Its parameters, accuracy and area of use are listed below.
Convert EPSG:4608 to EPSG:8240 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4608", "EPSG:8240", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Source: EPSG:4608 — NAD27(76)
geographic system using latitude and longitude on an ellipsoid · Area of use: Canada - Ontario
+proj=longlat +ellps=clrk66 +no_defs +type=crsMore about EPSG:4608 →
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=crsMore about EPSG:8240 →
Frequently asked questions
- How accurate is converting NAD27(76) to NAD83(CSRS)v3?
- The most accurate official EPSG transformation between these systems is accurate to about ±1 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.