Habitat classification of temperate marine macroalgal communities using bathymetric LiDAR
journal contributionposted on 2014-01-01, 00:00 authored by Richard ZavalasRichard Zavalas, Daniel IerodiaconouDaniel Ierodiaconou, D Ryan, Alexander Rattray, J Monk
Here, we evaluated the potential of using bathymetric Light Detection and Ranging (LiDAR) to characterise shallow water (<30 m) benthic habitats of high energy subtidal coastal environments. Habitat classification, quantifying benthic substrata and macroalgal communities, was achieved in this study with the application of LiDAR and underwater video groundtruth data using automated classification techniques. Bathymetry and reflectance datasets were used to produce secondary terrain derivative surfaces (e.g., rugosity, aspect) that were assumed to influence benthic patterns observed. An automated decision tree classification approach using the Quick Unbiased Efficient Statistical Tree (QUEST) was applied to produce substrata, biological and canopy structure habitat maps of the study area. Error assessment indicated that habitat maps produced were primarily accurate (>70%), with varying results for the classification of individual habitat classes; for instance, producer accuracy for mixed brown algae and sediment substrata, was 74% and 93%, respectively. LiDAR was also successful for differentiating canopy structure of macroalgae communities (i.e., canopy structure classification), such as canopy forming kelp versus erect fine branching algae. In conclusion, habitat characterisation using bathymetric LiDAR provides a unique potential to collect baseline information about biological assemblages and, hence, potential reef connectivity over large areas beyond the range of direct observation. This research contributes a new perspective for assessing the structure of subtidal coastal ecosystems, providing a novel tool for the research and management of such highly dynamic marine environments. © 2014 by the authors; licensee MDPI, Basel, Switzerland.
Pagination2154 - 2175
Publication classificationC Journal article; C1 Refereed article in a scholarly journal
Copyright notice2014, The Authors
BathymetryCoastalExposed coastGroundtruth videoHabitat mappingLiDARreflectanceSubtidal macroalgaeScience & TechnologyLife Sciences & BiomedicinePhysical SciencesTechnologyEnvironmental SciencesGeosciences, MultidisciplinaryRemote SensingImaging Science & Photographic TechnologyEnvironmental Sciences & EcologyGeologyPROTECTED AREACOASTAL ZONEWATERMANAGEMENTELEVATIONINTENSITYFLORIDAVIDEOBAY