Lidar data on board one of our UAVs was acquired in the last field campaign early July for mapping forest structure in an alpine valley. The data delivered very good and interesting vertical information about the vegetation structure and the terrain of this study site. However, the actual UAV flight was very challenging due to the narrow valley, no/bad GPS reception and hardly a suitable launch/landing site. Nevertheless we managed to carry the UAV up the mountain and flew a few times before the weather conditions changed. We are very much looking forward to the next analysis with UAV Lidar, airborne Lidar, radar and multispectral plus various in-situ data sets.