EPSG systems

EPSG:30172 Tokyo / Japan Plane Rectangular CS XII

Projected system (Transverse Mercator) in use: Japan - zone XII. The full definition below, and conversion in one click.

Convert coordinates Open in Carte Download the .prj

System record
Code	EPSG:30172
Name	Tokyo / Japan Plane Rectangular CS XII
Type	Projected system — Transverse Mercator
Area of use	Japan - zone XII Japan - onshore - Hokkaido between approximately 141°E and 143°E - Sapporo city; Asahikawa city; Wakkanai city; Rumoi city; Bibai city; Yubari city; Iwamizawa city; Tomakomai city; Muroran city; Shibetsu city; Nayoro city; Ashibetsu city; Akabira city; Mikasa city; Takikawa city; Sunagawa city; Ebetsu city; Chitose city; Utashinai city; Fukagawa city; Monbetsu city; Furano city; Noboribetsu city; Eniwa city; Ishikari-shicho; Monbetsu-gun of Abashiri-shicho; Kamikawa-shicho; Soya-shicho; Hidaka-shicho; Iburi-shicho (except Usu-gun and Abuta-gun); Sorachi-shicho; Rumoi-shicho.
Bounds	W 140,89° · S 42,15° · E 143,61° · N 45,54°
Countries	Japan
Datum	Tokyo
Ellipsoid	Bessel 1841 a = 6377397.155 m · 1/f = 299.1528128
Base geographic system	EPSG:4301 — Tokyo
Unit	metre (X north, Y east)
Transformation to WGS 84	Tokyo to WGS 84 (108) (EPSG:15484) — accuracy 9 m
Scope	Cadastre, engineering survey, topographic mapping (large and medium scale).

Projection parameters

Parameter	Value	Unit
Latitude of natural origin	44	degree
Longitude of natural origin	142.25	degree
Scale factor at natural origin	0.9999	unity
False easting	0	metre
False northing	0	metre

proj4 definition

+proj=tmerc +lat_0=44 +lon_0=142.25 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +units=m +towgs84=-146.414,507.337,680.507 +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:30172.

WKT (ESRI format, the .prj content)

PROJCS["Japan_Zone_12",GEOGCS["GCS_Tokyo",DATUM["D_Tokyo",SPHEROID["Bessel_1841",6377397.155,299.1528128]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",142.25],PARAMETER["Scale_Factor",0.9999],PARAMETER["Latitude_Of_Origin",44.0],UNIT["Meter",1.0]]

All systems — Japan

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 — Japan