EPSG:3828 TWD67 / TM2 zone 121
Projected system (Transverse Mercator) in use: Taiwan - onshore - mainland. 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:3828 |
|---|---|
| Name | TWD67 / TM2 zone 121 |
| Type | Projected system — Transverse Mercator |
| Area of use |
Taiwan - onshore - mainland Taiwan, Republic of China - onshore - Taiwan Island. |
| Bounds | W 119,99° · S 21,87° · E 122,06° · N 25,34° |
| Countries | Taiwan |
| Datum | Taiwan Datum 1967 |
| Ellipsoid | GRS 1967 Modified a = 6378160 m · 1/f = 298.25 |
| Base geographic system | EPSG:3821 — TWD67 |
| Unit | metre (X east, Y north) |
| Transformation to WGS 84 | No simple transformation published (ellipsoid alone) |
| Scope | Cadastre, engineering survey, topographic mapping. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 0 | degree |
| Longitude of natural origin | 121 | degree |
| Scale factor at natural origin | 0.9999 | unity |
| False easting | 250000 | metre |
| False northing | 0 | metre |
proj4 definition
+proj=tmerc +lat_0=0 +lon_0=121 +k=0.9999 +x_0=250000 +y_0=0 +ellps=aust_SA +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:3828.
WKT (ESRI format, the .prj content)
PROJCS["TWD_1967_TM_Taiwan",GEOGCS["GCS_TWD_1967",DATUM["D_TWD_1967",SPHEROID["GRS_1967_Truncated",6378160.0,298.25]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",250000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",121.0],PARAMETER["Scale_Factor",0.9999],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]Other systems — Taiwan
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.