Convert coordinates from Tokyo (EPSG:4301) to JGD2000 (EPSG:4612) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.
The EPSG Geodetic Parameter Dataset defines 2 transformations between Tokyo (EPSG:4301) and JGD2000 (EPSG:4612). Each applies to a specific area — pick the one whose area of use covers your data.
Grid file: tky2jgd.gsb
NTv2 grid derived by ESRI from that supplied by GSI in application tky2jgd. After Tohoku earthquake of 2011 accuracy in northern Honshu reduced to 1-5m and in this area replaced by Tokyo to JGD2011 (tfm code 6714).
| Parameter | Value | Unit |
|---|---|---|
| X-axis translation(tx) | -146.414 | metre |
| Y-axis translation(ty) | 507.337 | metre |
| Z-axis translation(tz) | 680.507 | metre |
Derived at Tokyo datum origin. Accuracy on main islands 9m. Also used on remote islands with significantly less accuracy: Io-To 793m, Kitadaito and Minamidaito Jima 642m, Tarama and Minna Shima 560m, Ishigaki and Taketomi Jima 251m, Yonaguni Jima 248m.
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4301", "EPSG:4612", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)geographic system using latitude and longitude on an ellipsoid · Area of use: Asia - Japan and Korea
+proj=longlat +ellps=bessel +towgs84=-146.414,507.337,680.507,0,0,0,0 +no_defs +type=crsMore about EPSG:4301 →
geographic system using latitude and longitude on an ellipsoid · Area of use: Japan
+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs +type=crsMore about EPSG:4612 →