This paper presents a wave measurement technique based on single-video monitoring of moored buoys. A simple photogrammetry is proposed, with a constraint that the distance from video camera to buoy should be predetermined. The distance is approximated to a constant under the condition that it is much greater than the range of the buoy motion. Image coordinates of a buoy are mapped onto a spherical surface without significant errors in vertical ground coordinates. Wave characteristics are comparable to those from a bottom pressure gauge, indicating that the video technique has the potential to remotely measure waves in coastal environments. We anticipate our finding to be a starting point for an economic instrument of wave measurement through development of an automated image processing technique.
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1 November 2008
Nearshore Wave Measurement Using Single-Video Images of Buoy Motions
Baeck Oon Kim,
Hong Yeon Cho,
Dhong Il Lim,
Gil Lim Yoon,
Im Sang Oh,
Yong Ahn Park
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buoy motion
photogrammetry
video monitoring
wave measurement