Convert Astro DOS 71 to SHGD2015

Convert coordinates from Astro DOS 71 (EPSG:4710) to SHGD2015 (EPSG:7886) — 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-4710-to-epsg-7886

Official EPSG transformations from Astro DOS 71 to SHGD2015

The EPSG Geodetic Parameter Dataset defines 2 transformations between Astro DOS 71 (EPSG:4710) and SHGD2015 (EPSG:7886). Each applies to a specific area — pick the one whose area of use covers your data.

Astro DOS 71 to SHGD2015 (2)

EPSG:7895±0.1 mBest accuracy

Method:: Position Vector transformation (geog2D domain)
Area of use:: St Helena - St Helena Island
Scope:: Transformation of coordinates at 0.1m level of accuracy.

Parameter	Value	Unit
X-axis translation(tx)	-112.854	metre
Y-axis translation(ty)	12.27	metre
Z-axis translation(tz)	-18.913	metre
X-axis rotation(rx)	2.1692	arc-second
Y-axis rotation(ry)	16.8896	arc-second
Z-axis rotation(rz)	17.1961	arc-second
Scale difference(ds)	-19.54517	parts per million

Derived at 19 stations, RMS = 6cm. Note: Because of the large rotations about the Y- and Z-axes this transformation is not reversible. For the reverse transformation use SHGD2015 to Astro DOS 71 (2) (code 9226).

Astro DOS 71 to SHGD2015 (1)

EPSG:7893±0.15 m

Method:: Geocentric translations (geog2D domain)
Area of use:: St Helena - St Helena Island
Scope:: Medium accuracy applications.

Parameter	Value	Unit
X-axis translation(tx)	-323.65	metre
Y-axis translation(ty)	551.39	metre
Z-axis translation(tz)	-491.22	metre

Derived at 19 stations, RMS = 12cm. May be used as an approximate transformation to WGS 84 - see code 7894.

Convert EPSG:4710 to EPSG:7886 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4710", "EPSG:7886", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4710 — Astro DOS 71

geographic system using latitude and longitude on an ellipsoid · Area of use: St Helena - St Helena Island

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

More about EPSG:4710 →

Target: EPSG:7886 — SHGD2015

geographic system using latitude and longitude on an ellipsoid · Area of use: St Helena - St Helena Island

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

More about EPSG:7886 →

Frequently asked questions

How accurate is converting Astro DOS 71 to SHGD2015?: The most accurate official EPSG transformation between these systems is accurate to about ±0.1 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:7886 to EPSG:4710 →