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Zero-island coordinates
Null or unparsed lat/lng fields defaulting to (0,0) plot as real points in the Gulf of Guinea ('Null Island'), silently injecting fake density into that cell.
Class
Case to account for
Affects
1 conversion
01
Detection
Coordinate exactly (0.0, 0.0), or a statistically anomalous point cluster at the null-island cell.
02
Mitigation
01
Treat (0,0) as a null-parse sentinel, reject rather than index
02
Monitor cell 0,0's neighborhood for volume anomalies as a data-quality canary
03
Affected conversions
PointH3
OPENMore in Data quality
Accuracy-radius attritionAxis-order reversal (lat/lng swap)Coastal / mixed pixelsConfidence-convention mismatchDuplicated region IDsGeocoding uncertaintyIncomplete geometryMissing CRS declarationMissing polygonsRaster no-data valuesRaster/cell resolution mismatchRounded / truncated coordinatesWrong CRS assumed