Abstract
UAVs have been considered as one of the most powerful tools for coastal monitoring. 3D Topography of sandy beaches can be obtained with automatic flight of single UAV and 3D shape reconstruction technique. Furthermore, UAVs have been utilized for wave monitoring (Holman et al., 2017) as the video images or a series of still images from aerial cameras enable us to observe wave propagations from higher viewpoints. Although there are some proposed techniques to extract wave celerity and direction from the aerial images by UAV, there doesn't seem to be enough trials to obtain wave height, which is one of the most important parameters to consider coastal problems such as beach morphological changes. In this study, stereo image analysis for 3D shape reconstruction was applied to stereo image pairs by two UAVs as a test of the applicability of the existing stereo measurement technique and also possibility of 3D wave deformation measurement in field.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/QZBAwj5RIi4
Highlights
UAVs have been considered as one of the most powerful tools for coastal monitoring. 3D Topography of sandy beaches can be obtained with automatic flight of single UAV and 3D shape reconstruction technique
After automatic flight to the designated locations and altitudes, video images with 60 fps and 4096 x 2160 resolution were almost simultaneously recorded by the two UAVs (Figure 1)
As they don’t have a function for the synchronized recording, the video image pair was carefully observed to find the frames which have the same instant for synchronization with 1/60 second of accuracy
Summary
UAVs have been considered as one of the most powerful tools for coastal monitoring. 3D Topography of sandy beaches can be obtained with automatic flight of single UAV and 3D shape reconstruction technique. STUDY AREA AND DEVICES The measurement was conducted on Sendai Coast, which has a sandy beach with total length of about 12 km. Two UAVs (DJI, Phantom 4 Pro) were utilized for the measurement.
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