Zero-island coordinates

data_quality

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.

Zero-island coordinates illustration — ▪ Rendered from the real conversion/geometry code.

Detection

Coordinate exactly (0.0, 0.0), or a statistically anomalous point cluster at the null-island cell.

Mitigation

Treat (0,0) as a null-parse sentinel, reject rather than index
Monitor cell 0,0's neighborhood for volume anomalies as a data-quality canary

Affected conversions

Point → H3 exact