Diachronic UAV Photogrammetry of a Sandy Beach in Brittany (France) for a Long-Term Coastal Observatory. - Marion Jaud; Christophe Delacourt; Nicolas Le Dantec; Pascal Allemand; Jérôme Ammann; Philippe Grandjean; Henri Nouaille; Christophe Prunier; Véronique Cuq; Emmanuel Augereau; Lucie Cocquempot; France Floc'h (ISPRS Int. J. Geo Inf., 2019)