Underwater Photogrammetry for Change Detection
Alessandro CAPRA, Cristina CASTAGNETTI, Francesco MANCINI, Paolo ROSSI
Underwater surveying has been used for several applications in oil industry, archaeology and biology. The presentation will focus the attention on underwater photogrammetric surveying for change detection applications. Structure from Motion photogrammetry and underwater imagery allow the three-dimensional quantification of submersed structures characteristic at patch scale and structural complexity. High accuracy and resolution are required in order to guarantee the repeatability of surveys over time within the same reference system; a proper geodetic network and acquisition scheme are mandatory as well for 3D models generation. The direct comparison of multi-temporal point clouds enables the evaluation of the main trends and modification with an accuracy of millimeters to centimeters accuracy. Some examples of underwater photogrammetry for change detection will be shown and particularly with reference to a case study of multi-temporal underwater photogrammetric survey of a reef patch located in Moorea Island to detect a coral growth of about 10 mm\years.
Event: FIG Working Week 2020 – CANCELLED – Smart Surveyors for Land and Water Management
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