Bathymetric Survey of the St. Anthony Channel (Croatia) Using Multibeam Echosounders (MBES)—A New Methodological Semi-Automatic Approach of Point Cloud Post-Processing

Multibeam echosounders (MBES) have become a valuable tool for underwater floor mapping. However, MBES data are often loaded with different measurement errors. This study presents new user-friendly and methodological semi-automatic approach of point cloud post-processing error removal. The St. Anthony Channel (Croatia) was selected as the research area because it is regarded one most demanding sea or river passages in world protected significant landscape by Šibenik-Knin County. two main objectives this study, conducted within Interreg Italy–Croatia PEPSEA project, were to: (a) propose framework that would enable easier identification removal errors data; (b) create high-resolution integral model (MBES UAV data) maritime safety tourism promotion purposes. A hydrographic survey channel carried out using WASSP S3 while photogrammetry performed Matrice 210 RTK V2. proposed acquired completed Open Source CloudCompare software following five steps which various filtering methods used. reduction percentage points after denoising process 14.11%. Our results provided: filtering; detailed bathymetric map spatial resolution 50 cm; (c) first UAV) Channel. generated models can primarily be used In future research, ground-truthing (e.g., ROVs) will to validate models.