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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 positional shifts of 400 to 450 meters (such as between Tokyo Datum Bessel 1841 and WGS84). 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).
Geodetic Engineering Note
Verified against professional geodetic standards
The Cumulative Boundary & Engineering Rework Exposure: 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 Boundary Dispute Geodetic Offset 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
Consumer GNSS devices typically achieve 3–10m accuracy, though urban multipath can introduce errors up to 20–30m. This can cause critical errors in your data.
Check My AccuracyDatum Shift Risk
Using the wrong coordinate system (e.g. WGS84 vs NAD83) creates a systematic ~1 to 2m tectonic reference frame offset.
Verify My Datum