Bergsma E. W. J. auteur aut IRD Almar Rafaël auteur aut IRD de Almeida L. P. M. auteur aut IRD Sall M. auteur aut IRD text journalArticle eng text/pdf born digital access Commercial Unmanned Areal Vehicles (UAV) are taking a flight: it has never been more accessible to own an UAV and as easy to operate one, e.g. a drone. For coastal monitoring these advances open a new world of monitoring such as inter-tidal beach topography through Structure for Motion. This paper aims to 1) show the potential of the UAV-based depth inversion with 2) limited georeferencing resources for rectification, comparing traditional field-based GCPs and fully remote standalone methods (few local GCPs and Google Earth derived GCPs) and a 3) novel automated error reduction inclusion for the breakpoint location. Unlike with shore-based cameras, image stabilisation is key airborne bathymetry estimation. At places that are hard to reach it is not always possible to get ground control points. We discuss the use of Google Earth to obtain ground control points. In all video-derived bathymetries obtained in this work, great overestimation of the depth is found around wave breaking which is often linked to a phase shift in pixel intensity (dark wave front to white foam). A new method to overcome phase shift issues around breaking is presented that results in a significant error reduction of 58% around the break point. specialized UAV Remote sensing Bathymetry Nearshore SENEGAL SAINT LOUIS 032 126 152 103527 [8 ] 2019 0378-3839 https://www.documentation.ird.fr/hor/fdi:010077042 10.1016/j.coastaleng.2019.103527 0378-3839 [F B010077042] https://www.documentation.ird.fr/hor/fdi:010077042 https://www.documentation.ird.fr/intranet/publi/2019/10/010077042.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2019-11-05 2025-02-24 fdi:010077042 fre