EPSG:30171 Tokyo / Japan Plane Rectangular CS XI

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

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System record
Code	EPSG:30171
Name	Tokyo / Japan Plane Rectangular CS XI
Type	Projected system — Transverse Mercator
Area of use	Japan - zone XI Japan - onshore - Hokkaido west of approximately 141°E - Otaru city; Hakodate city; Date city; Usu-gun and Abuta-gun of Iburi-shicho; Hiyama-shicho; Shiribeshi-shicho; Oshima-shicho.
Bounds	W 139,34° · S 41,34° · E 141,46° · N 43,42°
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	140.25	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=140.25 +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:30171.

WKT (ESRI format, the .prj content)

PROJCS["Japan_Zone_11",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",140.25],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