Abstract
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 a 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 as one of the most demanding sea or river passages in the world and it is protected as a significant landscape by the Šibenik-Knin County. The two main objectives of this study, conducted within the Interreg Italy–Croatia PEPSEA project, were to: (a) propose a methodological framework that would enable the easier and user-friendly identification and removal of the errors in MBES data; (b) create a high-resolution integral model (MBES and UAV data) of the St. Anthony Channel for maritime safety and tourism promotion purposes. A hydrographic survey of the channel was carried out using WASSP S3 MBES while UAV photogrammetry was performed using Matrice 210 RTK V2. The proposed semi-automatic post-processing of the MBES acquired point cloud was completed in the Open Source CloudCompare software following five steps in which various point filtering methods were used. The reduction percentage in points after the denoising process was 14.11%. Our results provided: (a) a new user-friendly methodological framework for MBES point filtering; (b) a detailed bathymetric map of the St. Anthony Channel with a spatial resolution of 50 cm; and (c) the first integral (MBES and UAV) high-resolution model of the St. Anthony Channel. The generated models can primarily be used for maritime safety and tourism promotion purposes. In future research, ground-truthing methods (e.g., ROVs) will be used to validate the generated models.
Highlights
Introduction andBackground with regard to jurisdictional claims in Multibeam echosounders (MBES) are recognized as one of the most powerful and popular mapping technologies available for modern underwater exploration [1,2,3,4,5]
The minimum collected depth value in these unfiltered stored in 28 WPF documents
S3 multibeam wideband sounder temporarily installed on the small boat Luna
Summary
Channel was was carried outin inout hydrographic surveyof the Channel carried in October. It was an optimal solution because smaller dimensions and the the draft draft mademade the installation installation of easier. The smaller dimensions and the draft the installation of the components components smaller dimensions and made the of the the MBES components easier.
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