Nepal Flash Flood 2026

Part of the Humanitarian OpenStreetMap Team response activation for the 26 August 2026 Bhote Koshi and Trishuli flash flood in Nepal. AI-scored building damage per OpenStreetMap footprint across the upper Trishuli and Bhote Koshi corridor, from Rasuwagadhi to the Narayani confluence. Post imagery is a 26-scene Vantor open-data composite (2026-08-27 to 2026-09-08, roughly 0.4 m/px, about 9.8% cloud). Pre imagery is ESRI World Imagery. Building footprints come from OpenStreetMap and cover 20,367 features in the corridor; 8,421 fall inside the analyzed area and carry an AI damage class. Each feature carries `osm_id`, `osm_type`, `building`, a `damage` label (`no-visible-damage`, `minor-damage`, `major-damage`, `destroyed`) and a `damage_confidence`. Evaluated and validated against 3,896 OSM manually tagged affected buildings (3,185 destroyed + 711 damaged, 2026-09-12): destroyed precision 0.91, recall 0.78, F1 0.84; severe (major + destroyed) recall against manually tagged affected buildings 0.75. The reference layer is included in this dataset. Post-event imagery TMS: ``` https://titiler.hotosm.org/cog/tiles/WebMercatorQuad/{z}/{x}/{y}?url=https://production-raw-data-api.s3.amazonaws.com/ISO3/NPL/buildings/hot_flood_npl_buildings_damage_post.tif ``` For the wider corridor context, see Nepal Flood 2026 Flood Affected Area. - Source: OpenStreetMap, Vantor open data, ESRI World Imagery - Part of HOT disaster response exports on HDX by HOT

satellite imagery by Planet, acquired 2026-05-26 to 2026-05-26, 300 cm per pixel, published on OpenAerialMap.

satellite imagery by Planet, acquired 2026-05-26 to 2026-05-26, 300 cm per pixel, published on OpenAerialMap.

satellite imagery by Planet, acquired 2026-05-26 to 2026-05-26, 300 cm per pixel, published on OpenAerialMap.

satellite imagery by Planet, acquired 2026-05-26 to 2026-05-26, 300 cm per pixel, published on OpenAerialMap.

satellite imagery by Naxa Pvt Ltd, acquired 2026-08-25 to 2026-08-26, 1000 cm per pixel, published on OpenAerialMap.