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How the Verifier Works
The Verifier computes the Haversine great-circle distance between your original and claimed-transformed coordinate pairs. It then compares this against the expected shift range for the selected datum transformation pair, and classifies the result:
- Acceptable —Deviation is within the expected tolerance of the transformation method
- Suspicious —Deviation is outside expected range but below catastrophic mismatch tolerance. Manual review recommended.
- Severe Mismatch —Deviation strongly suggests a datum confusion error (e.g., Tokyo treated as JGD2011, GDA94 treated as GDA2020). Transformation is invalid —do not use in production.
Related Tools & Resources
Explore our full suite of coordinate transformation and compliance tools:
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 →