Source: 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=crsMore about EPSG:8427 →
Convert EPSG:8427 to EPSG:4611
Online coordinate converter from Hong Kong Geodetic CS (EPSG:8427) to Hong Kong 1980 (EPSG:4611). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
The EPSG dataset defines official transformation parameters for the reverse direction. See Hong Kong 1980 to Hong Kong Geodetic CS — the parameters are invertible.
Convert EPSG:8427 to EPSG:4611 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:8427", "EPSG:4611", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: 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=crsMore about EPSG:4611 →
Frequently asked questions
- How accurate is converting Hong Kong Geodetic CS to Hong Kong 1980?
- 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.