Feasibility of Objective Seabed Mapping Techniques in a Coastal Tidal Environment (Wadden Sea, Germany)
| Autor: | Enrico Miccadei, Tina Kunde, Valerio Piattelli, Davide Gasprino, F. Mascioli, Francesco Cerrone |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences lcsh:QE1-996.5 Sediment 010502 geochemistry & geophysics Inlet 01 natural sciences Training (civil) seabed mapping Wadden sea lcsh:Geology Germany object-based image analysis General Earth and Planetary Sciences Bathymetry Mapping techniques Segmentation Cluster analysis tidal inlet Seabed Geology 0105 earth and related environmental sciences Remote sensing |
| Zdroj: | Geosciences, Vol 11, Iss 49, p 49 (2021) Geosciences Volume 11 Issue 2 |
| ISSN: | 2076-3263 |
| Popis: | The growing interest in monitoring the marine environment has strongly encouraged governmental agencies and research institutes to undertake seabed mapping programs and stimulated scientific interest in innovative mapping methods and tools. In this study, object-based image analysis was used to map a very shallow tidal inlet, characterized by high sediment variability and intense morphodynamic processes. The aim was to test the feasibility of reproducible mapping approaches within extended mapping programs of complex coastal areas. The study is based on full-coverage, high-resolution bathymetry and reflectivity, calibrated by means of sediment samples. Seafloor segmentation and classification were based on a cluster analysis performed on reflectivity, slope, and ruggedness. Statistics of clusters were extracted and analysed to identify the optimal number of clusters and evaluate the suitability of the clustering process to differentiate different seabed types. Clusters and samples data were joined to create a training and validation dataset for characterizing the seabed and carrying out an accuracy assessment. Misclassifications were explored and referred to three main reasons: (i) The not-perfect correspondence between sediment boundaries of classification systems and boundaries derived from the clustering process (ii) the geomorphological features of the seabed and (iii) the position accuracy of samples. The study contributes to testing of the feasibility of objective methods and highlights the importance of joining acoustic, lithological, and geomorphological analysis. It highlights issues and the need to critically analyse the mapping results and improve the accuracy of collected data. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|