Recording and studying of the erosion reversal phenomena in tourist beaches of the Aegean islands (2015-2016)
MRSG developed specific methodologies for identifying coastline and coastal zones (coastal morphology). The availability of very high-resolution digital surface models (DSMs) and orthophoto maps is of increasing interest to all scientists, especially those monitoring small variations in the earth’s surface, such as coastline morphology. This methodology acquired and processed high-resolution data for coastal zones acquired by a vertical take-off and landing (VTOL) unmanned aerial vehicle (UAV) attached to a small commercial camera. The proposed methodology integrated computer vision algorithms for 3D representation with image processing techniques for analysis. The SfM pipeline was used to construct the DSMs and orthophotos with a measurement precision in the order of centimeters. GEOBIA is used to create objects by grouping pixels that had the same spectral characteristics together and extracting statistical features from them. The objects produced were classified by fuzzy classification using the statistical features as input. The classification output classes included beach composition (sand, rubble, and rocks) and sub-surface classes (seagrass, sand, algae, and rocks). The methodology was applied to two case studies of coastal areas with different compositions: a sandy beach with a large face and a rubble beach with a small face. Both are threatened by beach erosion and have been degraded by the action of sea storms.
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Funding: European Economic Area