EPSG:8433 Macao 1920 / Macao Grid
Projected system (Transverse Mercator) in use: China - Macao. The full definition below, and conversion in one click.
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.
| Code | EPSG:8433 |
|---|---|
| Name | Macao 1920 / Macao Grid |
| Type | Projected system — Transverse Mercator |
| 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 |
| Datum | Macao 1920 |
| Ellipsoid | International 1924 a = 6378388 m · 1/f = 297 |
| Base geographic system | EPSG:8428 — Macao 1920 |
| Unit | metre (N north, E east) |
| Transformation to WGS 84 | No simple transformation published (ellipsoid alone) |
| Scope | Cadastre, engineering survey, topographic mapping (large scale). |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 22.212397222222222 | degree |
| Longitude of natural origin | 113.53646944444445 | degree |
| Scale factor at natural origin | 1 | unity |
| False easting | 20000 | metre |
| False northing | 20000 | metre |
proj4 definition
+proj=tmerc +lat_0=22.2123972222222 +lon_0=113.536469444444 +k=1 +x_0=20000 +y_0=20000 +ellps=intl +units=m +no_defsPaste it into QGIS, proj4js, PostGIS (spatial_ref_sys) or GDAL. +towgs84 carries the EPSG transformation to WGS 84; the official code stays EPSG:8433.
WKT (ESRI format, the .prj content)
PROJCS["Macao_1920_Macao_Grid",GEOGCS["Macao_1920",DATUM["Macao_1920",SPHEROID["International_1924",6378388.0,297.0]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",20000.0],PARAMETER["False_Northing",20000.0],PARAMETER["Central_Meridian",113.536469444444],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",22.2123972222222],UNIT["Meter",1.0]]Other systems — China
- EPSG:4788New Beijing / 3-degree Gauss-Kruger CM 93E
- EPSG:4789New Beijing / 3-degree Gauss-Kruger CM 96E
- EPSG:4790New Beijing / 3-degree Gauss-Kruger CM 99E
- EPSG:4791New Beijing / 3-degree Gauss-Kruger CM 102E
- EPSG:4792New Beijing / 3-degree Gauss-Kruger CM 105E
- EPSG:4793New Beijing / 3-degree Gauss-Kruger CM 108E
- EPSG:4794New Beijing / 3-degree Gauss-Kruger CM 111E
- EPSG:4795New Beijing / 3-degree Gauss-Kruger CM 114E
- EPSG:4796New Beijing / 3-degree Gauss-Kruger CM 117E
- EPSG:4797New Beijing / 3-degree Gauss-Kruger CM 120E
- EPSG:4798New Beijing / 3-degree Gauss-Kruger CM 123E
- EPSG:4799New Beijing / 3-degree Gauss-Kruger CM 126E
- EPSG:4800New Beijing / 3-degree Gauss-Kruger CM 129E
- EPSG:4812New Beijing / 3-degree Gauss-Kruger CM 132E
- EPSG:4822New Beijing / 3-degree Gauss-Kruger CM 135E
- EPSG:8427Hong Kong Geodetic CS
- EPSG:8428Macao 1920
- EPSG:8431Macao 2008
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.