Ground Truth

Ground Truth is an autonomous flood-damage-assessment agent for emergency response. Given the 29–30 October 2024 Valencia DANA flash flood, it turns real satellite, rainfall, terrain, and map data into an actionable emergency brief in minutes. It maps flood extent with Sentinel-2 MNDWI change detection (cloud-masked), subtracts permanent water cross-validated against the JRC 38-year surface-water record (90.2 vs 87.8 km², ~3% agreement), intersects the flood with 31,463 real OpenStreetMap building footprints to rank the hardest-hit municipalities — Paiporta #1, matching the real-world epicentre — adds NASA MERRA-2 rainfall context, and confirms hydrologic plausibility against a Copernicus GLO-30 DEM (95% of flood pixels below 2 m elevation, zero above 100 m). Output: a verifier-passing brief + annotated map showing ≥15 km² new inundation and ≥254 flooded buildings, with every figure traceable to a tool output — no fabricated numbers.