Mapping European Spruce Bark Beetle Infestation at Its Early Phase Using Gyrocopter-Mounted Hyperspectral Data and Field Measurements. - Florian M. Hellwig; Martyna A. Stelmaszczuk-Górska; Clémence Dubois; Marco Wolsza; Sina C. Truckenbrodt; Herbert Sagichewski; Sergej Chmara; Lutz Bannehr; Angela Lausch; Christiane Schmullius (Remote. Sens., 2021)