EPSG systems

EPSG:2339 Xian 1980 / Gauss-Kruger CM 81E

Projected system (Transverse Mercator) in use: China - 78°E to 84°E. 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.

Convert coordinates Open in Carte Download the .prj

System record
Code	EPSG:2339
Name	Xian 1980 / Gauss-Kruger CM 81E
Type	Projected system — Transverse Mercator
Area of use	China - 78°E to 84°E China - between 78°E and 84°E.
Bounds	W 77,98° · S 29,16° · E 84,00° · N 47,23°
Countries	China
Datum	Xian 1980
Ellipsoid	IAG 1975 a = 6378140 m · 1/f = 298.257
Base geographic system	EPSG:4610 — Xian 1980
Unit	metre (X north, Y east)
Transformation to WGS 84	No simple transformation published (ellipsoid alone)
Scope	Topographic mapping (medium scale).

Projection parameters

Parameter	Value	Unit
Latitude of natural origin	0	degree
Longitude of natural origin	81	degree
Scale factor at natural origin	1	unity
False easting	500000	metre
False northing	0	metre

proj4 definition

+proj=tmerc +lat_0=0 +lon_0=81 +k=1 +x_0=500000 +y_0=0 +ellps=IAU76 +units=m +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:2339.

WKT (ESRI format, the .prj content)

PROJCS["Xian_1980_GK_CM_81E",GEOGCS["GCS_Xian_1980",DATUM["D_Xian_1980",SPHEROID["Xian_1980",6378140.0,298.257]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Gauss_Kruger"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",81.0],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]

All systems — China

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

Projection parameters

proj4 definition

WKT (ESRI format, the .prj content)

Other systems — China