oceanlove

Exploring shallow lagoons with USV mapping technology   Autonomous and uncrewed mapping of the unique ecosystem of Gialova Lagoon By   George Papatheodorou ,  Maria Geraga ,  Elias Fakiris ,  Maria Papakonstantinou ,  Nikos Mavrommatis   •   June 20, 2023 Unmanned surface vehicles (USVs) are increasingly being used for the mapping and management of shallow-water environments such as lagoons, rivers and estuaries, due to their economic and ecological benefits. The Gialova Lagoon wetland in south-west Peloponnesus, Greece, is particularly difficult to navigate using crewed vessels and was therefore studied using a USV to identify the bathymetry, morphology and submerged aquatic vegetation coverage of the lagoon’s floor. The USV platform was equipped with various devices, including sidescan sonars, single- and multibeam echosounders, environmental sensors and waterproof cameras. The USV successfully navigated the shallow waters of the lagoon and a gr...

Development of digital bathymetric models from hydroacoustic and photogrammetric data   Geoinformatic techniques to combine bathymetric data for shallow and ultra-shallow waters By   Jacek Łubczonek ,  Witold Kazimierski ,  Grzegorz Zaniewicz   •   June 7, 2022 Unmanned vehicles, both surface and airborne, are increasingly being used for hydrographic surveying. While the technology of data acquisition using these platforms is generally known, the fusion of this data is still the subject of much research, and the methods applied often depend on the sensors used and the properties of the survey area. This study presents a method for fusing data acquired using unmanned surface vehicle (USV) and unmanned aerial vehicle (UAV) measurement platforms to develop a digital bathymetric model. The case analysed concerns shallow water and ultra-shallow water up to the boundary with the shoreline. Approaches for combining bathymetric data Various methods are currently us...