EPSG Library · Americas and Asia-Pacific

EPSG:6668 — JGD2011

Source: EPSG Dataset via PROJ 9.5.1 · Updated 2026-10-05

Summary

EPSG:6668 (JGD2011) is a geographic 2D coordinate reference system on the Japanese Geodetic Datum 2011 datum with coordinates in degrees. Area of use: Japan - onshore and offshore.

Type: geographic 2D
Datum: Japanese Geodetic Datum 2011
Units: degree
Axes: Lat, Lon

Definition

EPSG:6668 as published in the EPSG Dataset (PROJ 9.5.1).
Property	Value
EPSG code	EPSG:6668
Name	JGD2011
Type	Geographic 2d CRS
Datum	Japanese Geodetic Datum 2011
Ellipsoid	GRS 1980 (a = 6,378,137.000 m, 1/f = 298.257222)
Prime meridian	Greenwich
Axes	Geodetic latitude (Lat, north, degree); Geodetic longitude (Lon, east, degree)
Scope	Horizontal component of 3D system.
Bounding box	122.38° to 157.65° longitude, 17.09° to 46.05° latitude

Area of use

Japan - onshore and offshore.

Example coordinates

A WGS 84 point at longitude 140.015°, latitude 31.57° (inside the area of use) has these coordinates in EPSG:6668:

Computed with PROJ using the EPSG default operation: axis order change (2D) + Inverse of JGD2011 to WGS 84 (1) + axis order change (2D).
Axis	Value	Unit
Longitude	140.015000	°
Latitude	31.570000	°

Open this conversion in the coordinate converter

Transformations to WGS 84

Candidate operations from the EPSG Dataset, best first as ranked by PROJ.
Operation	Accuracy	Area of use
axis order change (2D) + JGD2011 to WGS 84 (1) + axis order change (2D)	1 m	Japan - onshore and offshore.

Transformations change the datum, so each has an accuracy and an area of use. Choose the most accurate one that covers your data and record its name. See datum transformations.

Definitions and downloads

PROJ string

+proj=longlat +ellps=GRS80 +no_defs +type=crs

A PROJ string cannot carry every EPSG detail (axis order, datum ensemble, transformations). Prefer WKT2 or the EPSG code itself.

Proj4js definition used by the converter

+proj=longlat +ellps=GRS80 +towgs84=0,0,0 +no_defs

Datum shift from JGD2011 to WGS 84 (1) (EPSG accuracy 1 m), the best single Helmert operation for this area of use. Where PROJ prefers a grid-based or multi-step operation (see the table above), results can differ by up to that operation's accuracy.

WKT2:2019

GEOGCRS["JGD2011", DATUM["Japanese Geodetic Datum 2011", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], CS[ellipsoidal,2], AXIS["geodetic latitude (Lat)",north, ORDER[1], ANGLEUNIT["degree",0.0174532925199433]], AXIS["geodetic longitude (Lon)",east, ORDER[2], ANGLEUNIT["degree",0.0174532925199433]], USAGE[ SCOPE["Horizontal component of 3D system."], AREA["Japan - onshore and offshore."], BBOX[17.09,122.38,46.05,157.65]], ID["EPSG",6668]]

Downloads

6668.prj — ESRI WKT for shapefiles
6668.wkt — OGC WKT2:2019

FAQ

What is EPSG:6668?

EPSG:6668 (JGD2011) is a geographic 2D coordinate reference system on the Japanese Geodetic Datum 2011 datum with coordinates in degrees. Area of use: Japan - onshore and offshore.

Where can EPSG:6668 be used?

Its area of use is: Japan - onshore and offshore.

What is the axis order of EPSG:6668?

By the EPSG definition: Geodetic latitude, Geodetic longitude. Many GIS formats such as GeoJSON and KML store longitude first instead.

How accurate is the transformation from EPSG:6668 to WGS 84?

The most accurate EPSG transformation listed here is “axis order change (2D) + JGD2011 to WGS 84 (1) + axis order change (2D)”, with a stated accuracy of 1 m for Japan - onshore and offshore.. Always check the area of use before applying it.

Coordinate systems

Articles

Tools

References

IOGP. EPSG Geodetic Parameter Dataset, epsg.org/crs_6668.
PROJ 9.5.1 / pyproj 3.7.2, used to compute every value on this page.

Cite this page

GeoCAD Bridge. “EPSG:6668 — JGD2011.” GeoCAD Bridge EPSG Library, updated 2026-10-05. https://www.geocadbridge.com/epsg/6668/