RIVER MORPHOLOGY MONITORING OF A SMALL-SCALE ALPINE RIVERBED USING DRONE PHOTOGRAMMETRY AND LIDAR. - Backes, D.; Smigaj, M.; Schimka, M.; Zahs, V.; Grznárová, A.; Scaioni, M. (International Archives of the Photogrammetry, Remote Sensing & Spatial Information Sciences, 2020)