Classification of Multibeam Sonar Image Using the Weyl Transform

Zhao, Ting; Lazendić, Srđan; Zhao, Yang; Montereale-Gavazzi, Giacomo; Pižurica, Aleksandra

doi:10.1007/978-3-030-31254-1_25

Cited by 1 publication

(1 citation statement)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Promising new possibilities at various stages of the classification process are currently being developed. These include developments of remote sensing technology and improvements of backscatter processing approaches, including the merging of uncalibrated backscatter mosaics [101], calibrated backscatter [102], multispectral backscatter [103], ARA [104] and HAC [21], acquiring more representative samples by applying rigorous sampling designs [105,106] and the derivation of novel features from the primary MBES data with increased discriminatory power for sediment classification [107,108]. We expect progress to mainly occur through refinement at each stage of the mapping process as discussed above.…”

Section: Discussionmentioning

confidence: 99%

Limitations of Predicting Substrate Classes on a Sedimentary Complex but Morphologically Simple Seabed

et al. 2020

View full text Add to dashboard Cite

The ocean floor, its species and habitats are under pressure from various human activities. Marine spatial planning and nature conservation aim to address these threats but require sufficiently detailed and accurate maps of the distribution of seabed substrates and habitats. Benthic habitat mapping has markedly evolved as a discipline over the last decade, but important challenges remain. To test the adequacy of current data products and classification approaches, we carried out a comparative study based on a common dataset of multibeam echosounder bathymetry and backscatter data, supplemented with groundtruth observations. The task was to predict the spatial distribution of five substrate classes (coarse sediments, mixed sediments, mud, sand, and rock) in a highly heterogeneous area of the south-western continental shelf of the United Kingdom. Five different supervised classification methods were employed, and their accuracy estimated with a set of samples that were withheld. We found that all methods achieved overall accuracies of around 50%. Errors of commission and omission were acceptable for rocky substrates, but high for all sediment types. We predominantly attribute the low map accuracy regardless of mapping approach to inadequacies of the selected classification system, which is required to fit gradually changing substrate types into a rigid scheme, low discriminatory power of the available predictors, and high spatial complexity of the site relative to the positioning accuracy of the groundtruth equipment. Some of these issues might be alleviated by creating an ensemble map that aggregates the individual outputs into one map showing the modal substrate class and its associated confidence or by adopting a quantitative approach that models the spatial distribution of sediment fractions. We conclude that further incremental improvements to the collection, processing and analysis of remote sensing and sample data are required to improve map accuracy. To assess the progress in benthic habitat mapping we propose the creation of benchmark datasets.

show abstract