Convert Ammassalik 1958 to GR96

Convert coordinates from Ammassalik 1958 (EPSG:4196) to GR96 (EPSG:4747) — 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-4196-to-epsg-4747

Official EPSG transformations from Ammassalik 1958 to GR96

The EPSG Geodetic Parameter Dataset defines 2 transformations between Ammassalik 1958 (EPSG:4196) and GR96 (EPSG:4747). Each applies to a specific area — pick the one whose area of use covers your data.

Ammassalik 1958 to GR96 (2)

EPSG:10961±0.4 mBest accuracy

Method:: Coordinate Frame rotation (geog2D domain)
Area of use:: Greenland - Ammassalik area
Scope:: Spatial referencing.

Parameter	Value	Unit
X-axis translation(tx)	308.9415	metre
Y-axis translation(ty)	136.202	metre
Z-axis translation(tz)	986.3661	metre
X-axis rotation(rx)	-3.8742	arc-second
Y-axis rotation(ry)	3.77827	arc-second
Z-axis rotation(rz)	-7.61345	arc-second
Scale difference(ds)	-171.67315	parts per million

Determined through the GR96(1996) coordinates of 34 points, standard deviation 0.2m. Replaces Ammassalik 1958 to GR96 (1) (code 15900).

Ammassalik 1958 to GR96 (1)

EPSG:15900±1 m

Method:: Position Vector transformation (geog2D domain)
Area of use:: Greenland - Ammassalik area
Scope:: Spatial referencing.

Parameter	Value	Unit
X-axis translation(tx)	-45	metre
Y-axis translation(ty)	417	metre
Z-axis translation(tz)	-3.5	metre
X-axis rotation(rx)	0	arc-second
Y-axis rotation(ry)	0	arc-second
Z-axis rotation(rz)	0.814	arc-second
Scale difference(ds)	-0.6	parts per million

Derived via NWL 9D.

Convert EPSG:4196 to EPSG:4747 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4196", "EPSG:4747", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4196 — Ammassalik 1958

geographic system using latitude and longitude on an ellipsoid · Area of use: Greenland - Ammassalik area

+proj=longlat +ellps=intl +towgs84=-45,417,-3.5,0,0,0.814,-0.6 +no_defs +type=crs

More about EPSG:4196 →

Target: EPSG:4747 — GR96

geographic system using latitude and longitude on an ellipsoid · Area of use: Greenland

+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs +type=crs

More about EPSG:4747 →

Frequently asked questions

How accurate is converting Ammassalik 1958 to GR96?: The most accurate official EPSG transformation between these systems is accurate to about ±0.4 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:4747 to EPSG:4196 →