Andriolo, U., Topouzelis, K., van Emmerik, T. H. M., Papakonstantinou, A., Monteiro, J. G., Isobe, A., Hidaka, M., Kako, S. i., Kataoka, T., and Gonçalves, G. (2023) Drones for litter monitoring on coasts and rivers: suitable flight altitude and image resolution, Mar. Pollut. Bull., 195, 115521, https://doi.org/10.1016/j.marpolbul.2023.115521