Convert Macao 2008 to Macao 1920

Convert coordinates from Macao 2008 (EPSG:8431) to Macao 1920 (EPSG:8428) — 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-8431-to-epsg-8428

Official EPSG transformation from Macao 2008 to Macao 1920

The EPSG Geodetic Parameter Dataset defines 1 transformation between Macao 2008 (EPSG:8431) and Macao 1920 (EPSG:8428). Its parameters, accuracy and area of use are listed below.

Macao 2008 to Macao 1920 (1)

EPSG:8435

Method:: Molodensky-Badekas (CF geog2D domain)
Area of use:: Macao
Scope:: Transformation of coordinates at 1m level of accuracy.

Parameter	Value	Unit
X-axis translation(tx)	202.865	metre
Y-axis translation(ty)	303.99	metre
Z-axis translation(tz)	155.873	metre
X-axis rotation(rx)	34.067	arc-second
Y-axis rotation(ry)	-76.126	arc-second
Z-axis rotation(rz)	-32.647	arc-second
Scale difference(ds)	-6.096	parts per million
Pivot X(px)	-2361757.652	metre
Pivot Y(py)	5417232.187	metre
Pivot Z(pz)	2391453.053	metre

Derived at 3 stations in 2008. Accuracy not stated.

Convert EPSG:8431 to EPSG:8428 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:8431", "EPSG:8428", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:8431 — Macao 2008

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

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

More about EPSG:8431 →

Target: EPSG:8428 — Macao 1920

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

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

More about EPSG:8428 →

Frequently asked questions

How accurate is converting Macao 2008 to Macao 1920?: Projection-only conversions are accurate to floating-point precision. If a datum shift is involved, browser-based tools use Helmert parameters which are accurate to roughly 1-5 m; for surveying-grade work apply the official grid-shift 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:8428 to EPSG:8431 →