Convert SIGD61 to WGS 84

Convert coordinates from SIGD61 (EPSG:4726) 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-4726-to-epsg-4326

Official EPSG transformations from SIGD61 to WGS 84

The EPSG Geodetic Parameter Dataset defines 3 transformations between SIGD61 (EPSG:4726) and WGS 84 (EPSG:4326). Each applies to a specific area — pick the one whose area of use covers your data.

SIGD61 to WGS 84 (3)

EPSG:6143±1 mBest accuracy

Method:: Coordinate Frame rotation (geog2D domain)
Area of use:: Cayman Islands - Little Cayman and Cayman Brac
Scope:: (null/copy) Approximation for medium and low accuracy applications assuming equality between plate-fixed static and earth-fixed dynamic CRSs, ignoring static/dynamic CRS differences.

Parameter	Value	Unit
X-axis translation(tx)	8.853	metre
Y-axis translation(ty)	-52.644	metre
Z-axis translation(tz)	180.304	metre
X-axis rotation(rx)	0.393	arc-second
Y-axis rotation(ry)	2.323	arc-second
Z-axis rotation(rz)	-2.96	arc-second
Scale difference(ds)	-24.081	parts per million

Parameter values are taken from SIGD59 to CIGD11 (1) (code 6137) assuming that CIGD11 and WGS 84 can be considered the same to within the accuracy of the transformation.

SIGD61 to WGS 84 (2)

EPSG:15829±1 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Cayman Islands - Little Cayman and Cayman Brac
Scope:: Topographic mapping.

Parameter	Value	Unit
X-axis translation(tx)	44.4	metre
Y-axis translation(ty)	109	metre
Z-axis translation(tz)	151.7	metre

Determined from 2 satellite stations. Accuracy +/- 1m.

SIGD61 to WGS 84 (1)

EPSG:15814±44 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Cayman Islands - Little Cayman and Cayman Brac
Scope:: Military survey.

Parameter	Value	Unit
X-axis translation(tx)	42	metre
Y-axis translation(ty)	124	metre
Z-axis translation(tz)	147	metre

Determined from 1 satellite station. Accuracy +/- 25m in each axis.

Convert EPSG:4726 to EPSG:4326 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4726", "EPSG:4326", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4726 — SIGD61

geographic system using latitude and longitude on an ellipsoid · Area of use: Cayman Islands - Little Cayman and Cayman Brac

+proj=longlat +ellps=clrk66 +no_defs +type=crs

More about EPSG:4726 →

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 SIGD61 to WGS 84?: 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 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:4726 →