Remote sensing of nearshore currents using coastal optical imagery
SCOPUS
KCI
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Title
- Remote sensing of nearshore currents using coastal optical imagery
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Author(s)
- Yoo, J.; Kim, S.-S.
- KIOST Author(s)
- Yoo, Jeseon(유제선)
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Alternative Author(s)
- 유제선; 김선신
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Publication Year
- 2015
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Abstract
- In-situ measurements are labor-intensive, time-consuming, and limited in their ability to observe currents with spatial variations in the surf zone. This paper proposes an optical image-based method of measurement of currents in the surf zone. This method measures nearshore currents by tracking in time wave breaking-induced foam patches from sequential images. Foam patches in images tend to be arrayed with irregular pixel intensity values, which are likely to remain consistent for a short period of time. This irregular intensity feature of a foam patch is characterized and represented as a keypoint using an imagebased object recognition method, i.e., Scale Invariant Feature Transform (SIFT). The keypoints identified by the SIFT method are traced from time sequential images to produce instantaneous velocity fields. In order to remove erroneous velocities, the instantaneous velocity fields are filtered by binding them within upper and lower limits, and averaging the velocity data in time and space with a certain interval. The measurements that are obtained by this method are comparable to the results estimated by an existing image-based method of observing currents, named the Optical Current Meter (OCM). © 2015, Korea Ocean Research and Development Institute. All rights reserved.
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ISSN
- 1598-141X
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/2580
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DOI
- 10.4217/OPR.2015.37.1.011
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Bibliographic Citation
- Ocean and Polar Research, v.37, no.1, pp.11 - 22, 2015
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Publisher
- Korea Ocean Research and Development Institute
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Subject
- coastal current; nearshore dynamics; remote sensing; satellite imagery; spatial variation; surf zone; wave breaking; wave velocity
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Keywords
- Digital optical imagery; Nearshore currents; Remote sensing; Surf zone; Wave-induced foam
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Type
- Article
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Language
- Korean
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Document Type
- Article
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