Morpho–Sedimentary Monitoring in a Coastal Area, from 1D to 2.5D, Using Airborne Drone Imagery

Abstract

Coastal areas are among the most endangered places in the world, due to their exposure to both marine and terrestrial hazards. Coastal areas host more than two-thirds of the world’s population, and will become increasingly affected by global changes, in particular, rising sea levels. Monitoring and protecting the coastlines have impelled scientists to develop adequate tools and methods to spatially monitor morpho-sedimentary coastal areas. This paper presents the capabilities of the aerial drone, as an “all-in-one” technology, to drive accurate morpho-sedimentary investigations in 1D, 2D and 2.5D at very high resolution. Our results show that drone-related fine-resolution, high accuracies and point density outperform the state-of-the-science manned airborne passive and active methods for shoreline position tracking, digital elevation model as well as point cloud creation. We further discuss the reduced costs per acquisition campaign, the increased spatial and temporal resolution, and demonstrate the potentialities to carry out diachronic and volumetric analyses, bringing new perspectives for coastal scientists and managers.

Using Multispectral Drone Imagery for Spatially Explicit Modeling of Wave Attenuation through a Salt Marsh Meadow

“…The use of drone technology for the imagery acquisition and for the generation of digital surface models (DSMs), using structure from motion (SfM) photogrammetry [15], is of many interests, especially for the coastal monitoring [16]. It allows for creating orthophotomosaics and DSMs at VHSR and very high temporal resolution (VHTR) [17].…”

Enhancing Uav Coastal Mapping Using Infrared Pansharpening

“…Unmanned aerial vehicles (UAV) have been successful to investigate the coastline evolution (Green et al, 2015) and habitat mapping (Collin et al, 2019) at very high spatio-temporal resolution. In the temporal and spatial monitoring of coastal habitats, UAV have the potential to be quickly operational thanks to their easy deployment and implementation (Mury et al, 2019). Data collection allows the monitoring of different habitats and species threatened by the erosion of the foot of the dune.…”

Spatiotemporal Trends of Bora Bora’s Shoreline Classification and Movement Using High Resolution Imagery From 1955 to 2019

“…The recent availability of data from satellites with daily and high spatial resolution imaging capacity (e.g., [19]) as well as the LiDAR campaign conducted on Bora Bora in 2015 [20] could be combined for future high-resolution 2D or 2.5D monitoring (see review by [8]) of the evolution of the coastline of the island and help to disentangle the individual effects of various factors (background waves, storms, constructions) on sedimentary processes.…”

“…On Bora Bora, the availability of imagery from 1955 to 2019 enables long-term monitoring of changes through manual photo-interpretation of VHR aerial and satellite imagery [8]. This article aims at addressing the issue of coastal modification and its impacts on the shoreline classification and position on Bora Bora from 1955 to 2019 through an original long-term and very high-resolution approach.…”