An Evaluation of Image Velocimetry Techniques under Low Flow Conditions and High Seeding Densities Using Unmanned Aerial Systems. - Sophie Pearce; Robert Ljubicic; Salvador Peña-Haro; Matthew Perks; Flavia Tauro; Alonso Pizarro; Silvano F. Dal Sasso; Dariia Strelnikova; Salvatore Grimaldi; Ian Maddock; Gernot Paulus; Jasna Plavsic; et al. (Remote. Sens., 2020)