EPSG systems

EPSG:21420 Beijing 1954 / Gauss-Kruger zone 20

Projected system (Transverse Mercator) in use: China - 114°E to 120°E onshore. The full definition below, and conversion in one click.

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System record
Code	EPSG:21420
Name	Beijing 1954 / Gauss-Kruger zone 20
Type	Projected system — Transverse Mercator
Area of use	China - 114°E to 120°E onshore China - onshore between 114°E and 120°E.
Bounds	W 114,00° · S 22,14° · E 120,00° · N 51,52°
Countries	China
Datum	Beijing 1954
Ellipsoid	Krassowsky 1940 a = 6378245 m · 1/f = 298.3
Base geographic system	EPSG:4214 — Beijing 1954
Unit	metre (X north, Y east)
Transformation to WGS 84	Beijing 1954 to WGS 84 (2) (EPSG:15919) — accuracy 15 m
Scope	Topographic mapping (medium scale).

Projection parameters

Parameter	Value	Unit
Latitude of natural origin	0	degree
Longitude of natural origin	117	degree
Scale factor at natural origin	1	unity
False easting	20500000	metre
False northing	0	metre

proj4 definition

+proj=tmerc +lat_0=0 +lon_0=117 +k=1 +x_0=20500000 +y_0=0 +ellps=krass +units=m +towgs84=15.53,-113.82,-41.38,0,0,0.814,-0.38 +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:21420.

WKT (ESRI format, the .prj content)

PROJCS["Beijing_1954_GK_Zone_20",GEOGCS["GCS_Beijing_1954",DATUM["D_Beijing_1954",SPHEROID["Krasovsky_1940",6378245.0,298.3]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Gauss_Kruger"],PARAMETER["False_Easting",20500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",117.0],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