Oblique Aerial Photographs from October 13 and 17, 2024, of Landslides and Flooding Caused by Hurricane Helene (ver 1.1, March 2025)

This data release consists of geotagged oblique aerial photographs taken by U.S. Geological Survey (USGS) scientists to support landslide situational awareness following Hurricane Helene under mission assignment from the Federal Emergency Management Agency (FEMA). The data release is accompanied by a photo viewer map where select photos can be viewed interactively. The photographs were taken on October 13 and 17, 2024, from two helicopters flying simultaneously on both days. The team used three different camera models (Canon EOS 6D Mark II, iPhone 14 Plus, iPhone 15 Pro Max). Photos were taken primarily through an open window, but some were taken through a closed window or the windshield and may include glare or reflections. Flight paths, shown on Figure 1, were planned based on known areas of substantial landslide and flood activity, specific areas of concern relevant to the response, areas of high estimated hazard based on rainfall and landslide susceptibility, and sites not visited or well-visualized by earlier reconnaissance flights from fixed-wing aircraft.

本数据集包含由美国地质调查局（U.S. Geological Survey, USGS）科研人员拍摄的带地理标签倾斜航空摄影照片，该项任务由联邦紧急事务管理局（Federal Emergency Management Agency, FEMA）指派，旨在助力飓风海伦过境后的滑坡态势研判工作。本数据集附带一款照片浏览地图，支持交互式查看精选照片。上述照片拍摄于2024年10月13日与17日，两日均由两架直升机同步执行飞行任务完成拍摄。拍摄团队使用了三款不同型号的相机（Canon EOS 6D Mark II、iPhone 14 Plus、iPhone 15 Pro Max）。照片拍摄主要通过开启的车窗完成，但部分照片经由关闭的车窗或挡风玻璃拍摄，可能存在眩光或反光现象。如图1所示，本次飞行航线基于以下原则规划：已知发生大规模滑坡与洪涝灾害的区域、与应急响应相关的重点关切区域、基于降雨与滑坡敏感性评估得出的高风险区域，以及此前固定翼飞机侦察飞行未覆盖或未充分观测的点位。