Convert WGS84 to Tokyo Datum
Standard GPS data (WGS84) does not match older Japanese maps (Tokyo Datum). This tool applies the necessary shift (~450m) to align your data with official survey maps.
How to Use
Enter WGS84 Latitude and Longitude. Calculate to get Tokyo Datum coordinates.
Online Tool
Use Cases
- Checking property boundaries against Showa-era maps.
- Construction projects referencing old survey benchmarks.
FAQ
Q: How big is the difference?
A: In Tokyo, it is about 450 meters. Ignoring this causes major errors.
Q: Is this JGD2011?
A: No. JGD2011 is effectively WGS84. This tool converts to the OLD Tokyo Datum (Bessel).
Q: Can I use this for official registration?
A: No. For legal registration, use GSI's PatchJGD software.
Professional Verification Disclaimer
This content is provided for decision-support and educational purposes for geospatial professionals and does not constitute legal, surveying, or engineering advice. Regulations and official standards vary by jurisdiction and project scope. Information is based on publicly available standards as of January 11, 2026. For critical projects, always verify current requirements with:
- Licensed Professional Surveyors or Professional Engineers (PE) in the relevant jurisdiction
- Certified attorneys for legal interpretation of regulations
- Current guidelines from relevant authorities (FAA, JCAB, GSI, etc.)
Reference: Professional Use & Scope