ADS-B coverageVolunteer ground-station networks are sparse mid-ocean and over remote regions; transatlantic and trans-Pacific flights regularly drop off our radar mid-flight.
AIS spoofingVessels can falsify their AIS broadcast or turn the transponder off entirely. The track is what the vessel says, not necessarily what it is.
Trail compactionOlder trail points are progressively coarsened to keep memory bounded, what you see is the most recent track at full fidelity, with older points sampled.
Imagery freshnessSentinel revisits a given location every few days at best; cloud cover frequently drops the usable window further. The latest scene may be days or weeks old.
Pattern false positivesHeuristics aren't classifiers. Every detector has a false-positive rate; the rail is a starting point for analyst review, not a verdict.
Country briefsBriefs reflect the editor's reading of public reporting at a point in time. They go stale. Treat the timestamp on each as the freshness cap.
AIS coverage gapsAIS depends on the vessel broadcasting; coverage is materially thinner in the Black Sea, the Strait of Hormuz approaches, and stretches of the Indian Ocean. Deliberate spoofing is routine in conflict zones.
FIRMS detection floorFIRMS has an intentional minimum-intensity floor below which low-power burns don't qualify as anomalies. Small industrial flares and trash burns sit below the floor by design; this is what keeps the layer signal-heavy.
Routine industrial flaresRefinery and gas-terminal flare-stack burnoff is classified separately as routine industrial activity and excluded from the live patterns rail. Re-promoted to a live alert when intensity spikes well above the site's baseline.
GDELT lagGDELT median lag from event to ingest is around 15 minutes; breaking events surface on the X and Telegram signal feeds first.
Wikipedia revisionsOutbreak case-count tables on Wikipedia occasionally ratchet downward when an editor reverts an over-eager update. We hold a max-floor non-regression so a smaller upstream snapshot does not overwrite a larger one already on disk.
Detectors not yet onA handful of vessel detectors (AIS-off near critical infrastructure, dark rendezvous) are written but gated off behind a feature flag until the OFAC sanctioned-vessel feed lands, which is what gives them the priors they need to stop firing on routine merchant traffic.