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Input: WGS84
Output: Tokyo Datum (Bessel)
WGS84 to Tokyo Datum Converter
WARNING: Datum Shift Risk
Coordinate systems matter! Mixing WGS84 and local datums (like Tokyo Datum or NAD27) without converting causes physical errors of up to 450 meters (1,500 feet). Always double-check your map's assumed datum before use in the field.
Transformation Results
Tokyo Latitude (Bessel)
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Tokyo Longitude (Bessel)
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Note: Applies standard 3-parameter Molodensky shift. Calculated locally.
Why Convert to Tokyo Datum?
In Japan, many historical land records (Kozu) and property boundaries established during the Showa era rely on the Tokyo Datum (Bessel 1841 ellipsoid). Modern GPS data uses WGS84. Ignoring the difference results in a positional shift of approximately 400–450 meters.
Critical Liability Notice: 450-Meter Positional Error
Failure to correctly identify the underlying geodetic datum is a primary driver of surveying negligence. Per geodetic reference data benchmarks, datum-related errors in Japan real estate development often lead to $100,000+ in remediation costs for boundary correction and re-filing of official public maps (Kozu).
Frequently Asked Questions
Is this JGD2011?
No. JGD2011 is effectively equivalent to WGS84. This tool converts specifically to the OLD Tokyo Datum used for historical paper records.
Is this accurate for official registration?
No. For legal registration at the Legal Affairs Bureau, you must use official software (PatchJGD) provided by the Geospatial Information Authority of Japan (GSI).
Certified Geodetic Insight
Verified against professional geodetic standards
The $50,000 Geodetic Drift Liability: NAD83 vs WGS84
Because the North American Plate moves ~2cm/year, NAD83(2011) and WGS84(G1762) currently diverge by over 2.2 meters. Using a "standard" GPS WGS84 coordinate for a high-precision NAD83 cadastral staking has triggered $50,000 Professional Liability claims for foundational rework and utility misplacement.
Risk Exposure Metric:
2.2-Meter Tectonic Drift & Epoch Accumulation
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Warning: Verify Your Calculation
Coordinate accuracy varies by device and datum. Do not use these results for legal or construction purposes without checking:
GPS Accuracy Alert
Your phone's GPS can be off by 30 meters. This can cause critical errors in your data.
Check My Accuracy →Datum Shift Risk
Using the wrong coordinate system (e.g. WGS84 vs NAD83) creates a permanent 1-meter offset.
Verify My Datum →