Convert coordinates from NAD83 (EPSG:4269) to NAD83(2011) (EPSG:6318) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.
Converting from generic NAD83 (EPSG:4269) to NAD83(2011) (EPSG:6318) is the conversion needed when migrating older U.S. federal data — tagged with the unspecified "NAD83" code — to the modern NAD83(2011) realisation. The two share a name and ellipsoid but differ by up to a metre in seismically active regions.
The transformation is published by NGS and is applied via Helmert parameters or NADCON 5.0 grid files. For most analytical work the NADCON grid result and the Helmert approximation agree at the centimetre level; for survey-grade work always use NADCON 5.0 in a desktop GIS or NGS's NCAT online service.
The EPSG Geodetic Parameter Dataset defines 1 transformation between NAD83 (EPSG:4269) and NAD83(2011) (EPSG:6318). Its parameters, accuracy and area of use are listed below.
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | 0 | metre |
| Y-axis translation(ty) | 0 | metre |
| Z-axis translation(tz) | 0 | metre |
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4269", "EPSG:6318", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)geographic system using latitude and longitude on an ellipsoid · Area of use: North America - NAD83
+proj=longlat +datum=NAD83 +no_defs +type=crsMore about EPSG:4269 →
geographic system using latitude and longitude on an ellipsoid · Area of use: USA - CONUS and Alaska; PRVI
+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs +type=crsMore about EPSG:6318 →