Coastal Traffic Authority

Strait movement observatory — 24 months of vessel movements, cross-filtered.

0 of 60,000 movements in view

Movements by class over time

Touches: class, month, anomaly

Movements by vessel class and month

Speed vs draught

Touches: class, route, month, anomaly; click-drag to brush

Speed vs draught records (nearest 40 to pointer, sampled)

Weekday by hour band

Touches: class, route, month, anomaly

Movements by weekday and hour band

Destinations

Touches: class, route, month, anomaly

Destination port rankings (with Other bucket)

Speed distribution

Touches: class, route, month, anomaly

Histogram bins for speed over ground

Self-test — incremental vs reference

Running at load

Each aggregate is computed by the incremental path (one pass over the filtered data) and compared with a brute-force reference over the full dataset. Tolerance 1e-6 relative. Scale assertions test the axis and binning maths directly.

Method

Design decisions and self-test results

Requirement status