NAD27 to NAD83(CSRS)v4 (10)
EPSG:9115±1.5 mBest accuracy- Method:
- NTv2
- Area of use:
- Canada - British Columbia - mainland
- Scope:
- Geodesy.
Grid file: BC_27_05.GSB
Derived through NAD83(CSRS)v4.
Convert NAD27 to NAD83(CSRS)v4
Convert coordinates from NAD27 (EPSG:4267) to NAD83(CSRS)v4 (EPSG:8246) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.
Official EPSG transformations from NAD27 to NAD83(CSRS)v4
The EPSG Geodetic Parameter Dataset defines 2 transformations between NAD27 (EPSG:4267) and NAD83(CSRS)v4 (EPSG:8246). Each applies to a specific area — pick the one whose area of use covers your data.
NAD27 to NAD83(CSRS)v4 (3)
EPSG:9336±2.5 m- Method:
- Concatenated operation
- Area of use:
- Canada - Alberta
- Scope:
- Transformation of coordinates at 1m to 2m level of accuracy.
- NAD27 to NAD83 (4) (null)
- NAD83 to NAD83(CSRS)v4 (3) (null)
Can be taken as an approximate transformation NAD27 to WGS 84 - see code 8585.
Convert EPSG:4267 to EPSG:8246 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4267", "EPSG:8246", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Source: EPSG:4267 — NAD27
geographic system using latitude and longitude on an ellipsoid · Area of use: North America - NAD27
+proj=longlat +datum=NAD27 +no_defs +type=crsMore about EPSG:4267 →
Target: EPSG:8246 — NAD83(CSRS)v4
geographic system using latitude and longitude on an ellipsoid · Area of use: Canada
+proj=longlat +ellps=GRS80 +no_defs +type=crsMore about EPSG:8246 →
Frequently asked questions
- How accurate is converting NAD27 to NAD83(CSRS)v4?
- 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.