Multiscale and Hierarchical Classification for Benthic Habitat Mapping

Porskamp, Peter; Rattray, Alex; Young, Mary; Ierodiaconou, Daniel

doi:10.3390/geosciences8040119

Cited by 52 publications

(29 citation statements)

References 59 publications

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“…Conventional techniques, such as ground, ship-borne, and airborne-based surveying provide very accurate measurements (i.e., within a few centimeters) [8]. Currently, multibeam echosounders (MBES), which were originally designed for deep water measurements, are commonly used for high resolution bathymetry retrieval in nearshore areas [11,12], including surveys in challenging tidal environments (e.g., the German Wadden Sea [13] and Venetian Lagoon [14]). Recent developments have enabled their use in up to 1 m depths with resolutions reaching 0.05 m, which can be compared to high resolution light detection and ranging (LiDAR) data [14].…”

Section: Introductionmentioning

confidence: 99%

Monitoring Beach Topography and Nearshore Bathymetry Using Spaceborne Remote Sensing: A Review

et al. 2019

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With high anthropogenic pressure and the effects of climate change (e.g., sea level rise) on coastal regions, there is a greater need for accurate and up-to-date information about the topography of these systems. Reliable topography and bathymetry information are fundamental parameters for modelling the morpho-hydrodynamics of coastal areas, for flood forecasting, and for coastal management. Traditional methods such as ground, ship-borne, and airborne surveys suffer from limited spatial coverage and temporal sampling due to logistical constraints and high costs which limit their ability to provide the needed information. The recent advancements of spaceborne remote sensing techniques, along with their ability to acquire data over large spatial areas and to provide high frequency temporal monitoring, has made them very attractive for topography and bathymetry mapping. In this review, we present an overview of the current state of spaceborne-based remote sensing techniques used to estimate the topography and bathymetry of beaches, intertidal, and nearshore areas. We also provide some insights about the potential of these techniques when using data provided by new and future satellite missions.

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Section: Introductionmentioning

confidence: 99%

Monitoring Beach Topography and Nearshore Bathymetry Using Spaceborne Remote Sensing: A Review

et al. 2019

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“…In the applications of general geomorphometry, derivatives of slope, curvature, rugosity, and topographic position are among the most common variables calculated in studies characterising the marine environment [21]. Derivatives from bathymetric data have typically been generated based on window scales of 3 × 3 as this is typically the input grid size default setting of spatial software packages [22], however there are movements toward multiscale analysis [23,24]. This allows users to explore the function of variables at a range of fine to broad scales to determine what scales most effectively relate to the target of interest [25].…”

Section: Introductionmentioning

confidence: 99%

Techniques for Classifying Seabed Morphology and Composition on a Subtropical-Temperate Continental Shelf

et al. 2019

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In 2017, the New South Wales (NSW) Office of Environment and Heritage (OEH) initiated a state-wide mapping program, SeaBed NSW, which systematically acquires high-resolution (2–5 m cell size) multibeam echosounder (MBES) and marine LiDAR data along more than 2000 km of the subtropical-to-temperate southeast Australian continental shelf. This program considerably expands upon existing efforts by OEH to date, which have mapped approximately 15% of NSW waters with these technologies. The delivery of high volumes of new data, together with the vast repository of existing data, highlights the need for a standardised, automated approach to classify seabed data. Here we present a methodological approach with new procedures to semi-automate the classification of high-resolution bathymetry and intensity (backscatter and reflectivity) data into a suite of data products including classifications of seabed morphology (landforms) and composition (substrates, habitats, geomorphology). These methodologies are applied to two case study areas representing newer (Wollongong, NSW) and older (South Solitary Islands, NSW) MBES datasets to assess the transferability of classification techniques across input data of varied quality. The suite of seabed classifications produced by this study provide fundamental baseline data on seabed shape, complexity, and composition which will inform regional risk assessments and provide insights into biodiversity and geodiversity.

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“…Unlike in terrestrial applications of geomorphometry, for which DTMs need to be hydrologically corrected (e.g., by removing sinks), the preparation of DBMs for marine applications mainly consists in correcting errors and artefacts that could not be accounted for during the processing of raw data to generate the DBM or filling in data gaps to facilitate analyses and reduce potential edge effects. For instance, Porskamp et al [26] used Delaunay triangulation to stitch multiple datasets and fill any holes in the final product.…”

Section: Preprocessingmentioning

confidence: 99%

Charting the Course for Future Developments in Marine Geomorphometry: An Introduction to the Special Issue

2018

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The use of spatial analytical techniques for describing and classifying seafloor terrain has become increasingly widespread in recent years, facilitated by a combination of improved mapping technologies and computer power and the common use of Geographic Information Systems. Considering that the seafloor represents 71% of the surface of our planet, this is an important step towards understanding the Earth in its entirety. Bathymetric mapping systems, spanning a variety of sensors, have now developed to a point where the data they provide are able to capture seabed morphology at multiple scales, opening up the possibility of linking these data to oceanic, geological, and ecological processes. Applications of marine geomorphometry have now moved beyond the simple adoption of techniques developed for terrestrial studies. Whilst some former challenges have been largely resolved, we find new challenges constantly emerging from novel technology and applications. As increasing volumes of bathymetric data are acquired across the entire ocean floor at scales relevant to marine geosciences, resource assessment, and biodiversity evaluation, the scientific community needs to balance the influx of high-resolution data with robust quantitative processing and analysis techniques. This will allow marine geomorphometry to become more widely recognized as a sub-discipline of geomorphometry as well as to begin to tread its own path to meet the specific challenges that are associated with seabed mapping. This special issue brings together a collection of research articles that reflect the types of studies that are helping to chart the course for the future of marine geomorphometry.

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Multiscale and Hierarchical Classification for Benthic Habitat Mapping

Cited by 52 publications

References 59 publications

Monitoring Beach Topography and Nearshore Bathymetry Using Spaceborne Remote Sensing: A Review

Monitoring Beach Topography and Nearshore Bathymetry Using Spaceborne Remote Sensing: A Review

Techniques for Classifying Seabed Morphology and Composition on a Subtropical-Temperate Continental Shelf

Charting the Course for Future Developments in Marine Geomorphometry: An Introduction to the Special Issue

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