Convert Midway 1961 to WGS 84

Convert coordinates from Midway 1961 (EPSG:4727) to WGS 84 (EPSG:4326) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

From

Input (lon, lat (decimal degrees))

Output (lon, lat (decimal degrees))

Direct link to this transformation: epsgtransform.com/transform/epsg-4727-to-epsg-4326

Official EPSG transformations from Midway 1961 to WGS 84

The EPSG Geodetic Parameter Dataset defines 2 transformations between Midway 1961 (EPSG:4727) and WGS 84 (EPSG:4326). Each applies to a specific area — pick the one whose area of use covers your data.

Midway 1961 to WGS 84 (1)

EPSG:15817±44 mBest accuracy

Method:: Geocentric translations (geog2D domain)
Area of use:: Midway Islands - Sand and Eastern Islands
Scope:: Military survey.

Parameter	Value	Unit
X-axis translation(tx)	912	metre
Y-axis translation(ty)	-58	metre
Z-axis translation(tz)	1227	metre

Derived at 1 satellite station. Accuracy +/- 25m in each axis. Information source states "provided for historical purposes only. These parameter [values] should not be used". Replaced by Midway 1961 to WGS 84 (2) (tfm code 15818).

Midway 1961 to WGS 84 (2)

EPSG:15818±44 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Midway Islands - Sand and Eastern Islands
Scope:: Military survey.

Parameter	Value	Unit
X-axis translation(tx)	403	metre
Y-axis translation(ty)	-81	metre
Z-axis translation(tz)	277	metre

Derived at 1 satellite station. Accuracy +/- 25m in each axis. Replaces Midway 1961 to WGS 84 (1) (tfm code 15817).

Convert EPSG:4727 to EPSG:4326 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4727", "EPSG:4326", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4727 — Midway 1961

geographic system using latitude and longitude on an ellipsoid · Area of use: Midway Islands - Sand and Eastern Islands

+proj=longlat +ellps=intl +towgs84=403,-81,277,0,0,0,0 +no_defs +type=crs

More about EPSG:4727 →

Target: EPSG:4326 — WGS 84

geographic system using latitude and longitude on an ellipsoid · Area of use: World (by country)

+proj=longlat +datum=WGS84 +no_defs +type=crs

More about EPSG:4326 →

Frequently asked questions

How accurate is converting Midway 1961 to WGS 84?: The most accurate official EPSG transformation between these systems is accurate to about ±44 m within its stated area of use. Browser-based converters approximate datum shifts with Helmert parameters; for surveying-grade work apply the official transformation 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:4326 to EPSG:4727 →