Photogrammetrically UAV based terrain data generation and automatic extraction of torrential propertiesGregor Rafael Schmucki, Perry Bartelt, Yves Bühler, Andrin Caviezel, Christoph Graf, Mauro Marty, Andreas Stoffel and Christian HuggelE3S Web of Conf., 415 (2023) 03026DOI: https://doi.org/10.1051/e3sconf/202341503026