Three-dimensional data collection for coastal management - efficiency and applicability of terrestrial and airborne methods

• Published in: International journal of remote sensing Vol. 39; no. 24; pp. 9380 - 9399
• Main Authors: Gonçalves, José Alberto, Bastos, Luísa, Madeira, Sérgio, Magalhães, Américo, Bio, Ana
• Format: Journal Article
• Language: English
• Published: London Taylor & Francis 17.12.2018; Taylor & Francis Ltd
• Subjects: Aerial surveys; Autonomy; Coastal dynamics; Coastal management; Coastal morphology; Coastal zone management; Data collection; Digital mapping; Dynamics; Environmental monitoring; Lidar; Monitoring; Operating costs; Photography; Ratios; Resolution; Stereoscopy; Terrestrial environments; Topographic maps; Topographic surveying; Topographic surveys; Unmanned aerial vehicles; Weather conditions; Wind speed
• ISSN: 0143-1161; 1366-5901
• DOI: 10.1080/01431161.2018.1523591

Regular monitoring is essential to understand coastal morphodynamics and anthropic as well as natural impacts, at different temporal and spatial scales. A stereoscopic video-based terrestrial mobile mapping system, three airborne digital photography systems (mounted on a small manned airplane, a fixed-wing UAV and a multi-rotor UAV, respectively) and airborne LiDAR were compared in terms of: system features, such as range, autonomy, acquisition and operating costs; information supplied, its type and precision; and constraints to system applicability in coastal topographic surveys. Systems differed in resolution, efficiency, and applicability. The terrestrial and UAV-based systems provided the most accurate 3D data, being particularly suited for small-scale, high-resolution surveys. UAVs were easy to deploy, but limited by weather condition, particularly wind speed. Observations from a plane were most efficient and suited for larger areas. Airborne systems had the advantage of being less (UAV) to non-invasive (plane) and thus suitable for the monitoring of sensitive areas (e.g. dunes) and/or areas with difficult access. Systems should be chosen according to the specific survey aims, spatial scale, and local conditions, taking into account their applicability and cost-benefit ratios. They may complement each other to provide a comprehensive picture of coastal morphology and dynamics at different scales.