EPSG systems

EPSG:8428 Macao 1920

Geographic system in latitude and longitude, in use: China - Macao. Datum, ellipsoid and transformation to WGS 84 below.

EPSG publishes no simple transformation to WGS 84 for this datum: conversion works on the ellipsoid alone and can be off by tens of metres.

System record
CodeEPSG:8428
NameMacao 1920
TypeGeographic system
Area of use China - Macao
China - Macao - onshore and offshore.
Bounds W 113,52° · S 22,06° · E 113,68° · N 22,23°
Countries China
DatumMacao 1920
Ellipsoid International 1924 a = 6378388 m · 1/f = 297
Unit degree (Lat north, Lon east)
Transformation to WGS 84 No simple transformation published (ellipsoid alone)
ScopeGeodesy, cadastre, engineering survey, topographic mapping.

proj4 definition

+proj=longlat +ellps=intl +no_defs

Paste it into QGIS, proj4js, PostGIS (spatial_ref_sys) or GDAL. +towgs84 carries the EPSG transformation to WGS 84; the official code stays EPSG:8428.

WKT (ESRI format, the .prj content)

GEOGCS["Macao_1920",DATUM["Macao_1920",SPHEROID["International_1924",6378388.0,297.0]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]

All systems — China

Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.