Convert Hong Kong 1980 to Hong Kong Geodetic CS

Convert coordinates from Hong Kong 1980 (EPSG:4611) to Hong Kong Geodetic CS (EPSG:8427) — 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-4611-to-epsg-8427

Official EPSG transformation from Hong Kong 1980 to Hong Kong Geodetic CS

The EPSG Geodetic Parameter Dataset defines 1 transformation between Hong Kong 1980 (EPSG:4611) and Hong Kong Geodetic CS (EPSG:8427). Its parameters, accuracy and area of use are listed below.

Hong Kong 1980 to Hong Kong Geodetic CS (1)

EPSG:9913±1 m

Method:: Coordinate Frame rotation (geog2D domain)
Area of use:: Hong Kong
Scope:: Transformation of coordinates at 1m level of accuracy.

Parameter	Value	Unit
X-axis translation(tx)	-162.619	metre
Y-axis translation(ty)	-276.959	metre
Z-axis translation(tz)	-161.764	metre
X-axis rotation(rx)	-0.067753	arc-second
Y-axis rotation(ry)	2.243648	arc-second
Z-axis rotation(rz)	1.158828	arc-second
Scale difference(ds)	-1.094246	parts per million

Derived via ITRF96 @ 1998.121. Published 2002-03-01. Also published as a transformation to WGS 84 - see Hong Kong 1980 to WGS 84 (1) (code 1825).

Convert EPSG:4611 to EPSG:8427 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4611", "EPSG:8427", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4611 — Hong Kong 1980

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

+proj=longlat +ellps=intl +towgs84=-162.619,-276.959,-161.764,0.067753,-2.243648,-1.158828,-1.094246 +no_defs +type=crs

More about EPSG:4611 →

Target: EPSG:8427 — Hong Kong Geodetic CS

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

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

More about EPSG:8427 →

Frequently asked questions

How accurate is converting Hong Kong 1980 to Hong Kong Geodetic CS?: 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:8427 to EPSG:4611 →