This study presents an analysis of shoreline change on reef islands using unmanned aerial vehicle (UAV)-derived orthomosaics and digital surface models (DSMs) collected on Sipadan Island, Sabah, Malaysia, and Sasahura Ite Island, Isabel Province, Solomon Islands. The high resolution of UAV-derived orthomosaics enabled changes in the position of the base of beach to be detected with confidence. The accuracy of the UAV-derived DSMs was assessed against equivalent topographic profiles via root-mean-square error, and found to be <0.21 m in all but one case; this demonstrates the potential for using UAV-derived DSMs to interpret three-dimensional island beach morphology and detect patterns of geomorphic change. The correlation between planimetric and volumetric change along selected beach transects was also investigated and found to be variable, indicating that a multifaceted approach including both planimetric (two-dimensional) and volumetric (three-dimensional) metrics is of value when analysing reef-island change. However, interpretations of UAV-derived data must carefully consider errors associated with global positioning system (GPS) positioning, the distribution of ground control points, the chosen UAV flight parameters, and the data processing methodology. Further application of this technology has the potential to expand our understanding of reef-island morphodynamics and their vulnerability to sea-level rise and other stressors.


    Access

    Download


    Export, share and cite



    Title :

    Assessing Reef-Island Shoreline Change Using UAV-Derived Orthomosaics and Digital Surface Models




    Publication date :

    2019




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown




    Positional Precision Analysis of Orthomosaics Derived from Drone Captured Aerial Imagery

    I-Kuai Hung / Daniel Unger / David Kulhavy et al. | DOAJ | 2019

    Free access

    Shoreline Erosion Study, Pleasure Island, Texas

    Mason, Curtis / Grogg, William E. / Wheeler, Stephen C. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 1983

    Free access

    System and methods for semi-automated editing of orthomosaics built from remotely-sensed imagery

    TANG MATTHEW / THIEL JOHN / NECKELS DAVID | European Patent Office | 2019

    Free access