About the data

What this is

FloodWatch TH watches public cameras across Thailand, snapshots them every 10–15 minutes, and asks a vision model one question: is the road in this frame passable, wet, or impassable? Verdicts are published with their evidence — every row links to a "why?" page showing the frame, the model's raw answer, brightness, and hash. Humans confirm or correct in a review queue; corrections are the training data for tomorrow's model.

Guards we run on every source

• Stale-feed detection: identical frame hash across captures → cam flagged suspect.
• Night gate: frames darker than luma 40 are labelled night and never feed verdicts.
• Daylight-at-night audit: bright frames frozen for 2h+ between 00:00–05:00 ICT → suspect (caught the frozen Pattaya mirrors).
• SSRF guard: suggested URLs may never point at private/loopback hosts.
• Human review queue: machine verdicts stay machine verdicts until confirmed.

Known failure modes of sources

• Thai government cam hosts geo-block cloud IPs — several are unreachable from our worker by design of their firewall.
• Some "live" portals serve cached daylight frames at night (Pattaya city mirrors, 2026-09-26). Those cams stay off until proven fresh.
• Night glare: dry asphalt shines under streetlights; the prompt demands real water evidence before "wet".
• PTZ cams pan — reference-image comparison is disabled for them.

Satellite layer (GISTDA)

Province shading and the "Satellite overview" panel come from GISTDA's Disaster Platform public service (disaster.gistda.or.th/app-api/services/flood/*), the same endpoint their own web map uses — MODIS/SAR-derived flood extent aggregated per tambon for 1/3/7/30-day windows, synced daily at 07:30 ICT. It answers "how much area is flooded?"; cameras answer "is this road passable right now?". © GISTDA.

Coverage approach

1. Public webcam catalog (opencctv/windy/DOH/ITIC) — ≥1 cam per province, then density in flood-prone zones. Currently 6 provinces.
2. River/rain gauge overlay (thaiwater) — planned.
3. Satellite flood extent (GISTDA) during major events — planned.
4. Crowd: your suggestions fill the gaps.

Privacy

No accounts. Suggestions store IP + user-agent purely for spam defense; email is optional and only used for follow-up. Snapshots belong to their public operators; we show thumbnails for situational awareness with attribution.