Technical Specification Overview
| Parameter | Standard Value |
|---|---|
| Primary Geodetic Datum | JGD2011 |
| Legacy/Historical Datum | Tokyo Datum (Bessel) |
| Local Grid Projection | Japan Plane Rectangular |
| Known Datum Shift (vs WGS84) | 400 - 450 meters |
| National Mapping Authority | Geospatial Information Authority (GSI) |
Professional Compliance Warning
Failure to apply correct transformation parameters when converting from WGS84 (GPS) to JGD2011 creates a systematic 400 - 450 meters offset. In construction and legal surveying, this drift exceeds the allowable error margin for any certified geodetic workflow.
Open Japan Converter