Characterizing the spatial distribution of coral reefs in the South-Central Coast region of Viet Nam using Planetscope imagery

This study aims to understand the spatial distribution of coral reefs in the central region of Viet Nam. We classified live coral cover in Son Tra Peninsula (ST) and Cu Lao Cham Island (CLC) in the South-Central Coast Region of Viet Nam using the Maximum Likelihood Classifier on 3 m Planetscope imag...

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Autores principales:	Khanh V. Nguyen, Vinh C. Duong, Kinh T. Kieu, Thuong V. Tran, Cho-ying Huang, Ruth Reef, Thien M. Hoang
Formato:	article
Lenguaje:	EN
Publicado:	PeerJ Inc. 2021
Materias:	Coral health Supervised classification Son Tra Peninsula Cu Lao Cham Island Live coral cover Shallow fringing reefs Medicine R
Acceso en línea:	https://doaj.org/article/c046092654604c54a5f9939c6cff49a8
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id	oai:doaj.org-article:c046092654604c54a5f9939c6cff49a8
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spelling	oai:doaj.org-article:c046092654604c54a5f9939c6cff49a82021-11-04T15:05:31ZCharacterizing the spatial distribution of coral reefs in the South-Central Coast region of Viet Nam using Planetscope imagery10.7717/peerj.124132167-8359https://doaj.org/article/c046092654604c54a5f9939c6cff49a82021-11-01T00:00:00Zhttps://peerj.com/articles/12413.pdfhttps://peerj.com/articles/12413/https://doaj.org/toc/2167-8359This study aims to understand the spatial distribution of coral reefs in the central region of Viet Nam. We classified live coral cover in Son Tra Peninsula (ST) and Cu Lao Cham Island (CLC) in the South-Central Coast Region of Viet Nam using the Maximum Likelihood Classifier on 3 m Planetscope imagery. Confusion matrices and the accuracy of the classifier were assessed using field data (1,543 and 1,560 photographs in ST and CLC, respectively). The results showed that the reef’s width ranged from 30 to 300 m across the study site, and we were able to detect live coral cover across a depth gradient of 2 to 6 m below the sea surface. The overall accuracies of the classifier (the Kappa coefficient) were 76.78% (0.76) and 78.08% (0.78) for ST and CLC, respectively. We found that 60.25% of coral reefs in ST were unhealthy and the live coral cover was less than 50%, while 25.75% and 11.46% of those in CLC were in good and excellent conditions, respectively. This study demonstrates the feasibility of utilizing Planetscope imagery to monitor shallow coral reefs of small islands at a high spatial resolution of 3 m. The results of this study provide valuable information for coral reef protection and conservation.Khanh V. NguyenVinh C. DuongKinh T. KieuThuong V. TranCho-ying HuangRuth ReefThien M. HoangPeerJ Inc.articleCoral healthSupervised classificationSon Tra PeninsulaCu Lao Cham IslandLive coral coverShallow fringing reefsMedicineRENPeerJ, Vol 9, p e12413 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Coral health Supervised classification Son Tra Peninsula Cu Lao Cham Island Live coral cover Shallow fringing reefs Medicine R
spellingShingle	Coral health Supervised classification Son Tra Peninsula Cu Lao Cham Island Live coral cover Shallow fringing reefs Medicine R Khanh V. Nguyen Vinh C. Duong Kinh T. Kieu Thuong V. Tran Cho-ying Huang Ruth Reef Thien M. Hoang Characterizing the spatial distribution of coral reefs in the South-Central Coast region of Viet Nam using Planetscope imagery
description	This study aims to understand the spatial distribution of coral reefs in the central region of Viet Nam. We classified live coral cover in Son Tra Peninsula (ST) and Cu Lao Cham Island (CLC) in the South-Central Coast Region of Viet Nam using the Maximum Likelihood Classifier on 3 m Planetscope imagery. Confusion matrices and the accuracy of the classifier were assessed using field data (1,543 and 1,560 photographs in ST and CLC, respectively). The results showed that the reef’s width ranged from 30 to 300 m across the study site, and we were able to detect live coral cover across a depth gradient of 2 to 6 m below the sea surface. The overall accuracies of the classifier (the Kappa coefficient) were 76.78% (0.76) and 78.08% (0.78) for ST and CLC, respectively. We found that 60.25% of coral reefs in ST were unhealthy and the live coral cover was less than 50%, while 25.75% and 11.46% of those in CLC were in good and excellent conditions, respectively. This study demonstrates the feasibility of utilizing Planetscope imagery to monitor shallow coral reefs of small islands at a high spatial resolution of 3 m. The results of this study provide valuable information for coral reef protection and conservation.
format	article
author	Khanh V. Nguyen Vinh C. Duong Kinh T. Kieu Thuong V. Tran Cho-ying Huang Ruth Reef Thien M. Hoang
author_facet	Khanh V. Nguyen Vinh C. Duong Kinh T. Kieu Thuong V. Tran Cho-ying Huang Ruth Reef Thien M. Hoang
author_sort	Khanh V. Nguyen
title	Characterizing the spatial distribution of coral reefs in the South-Central Coast region of Viet Nam using Planetscope imagery
title_short	Characterizing the spatial distribution of coral reefs in the South-Central Coast region of Viet Nam using Planetscope imagery
title_full	Characterizing the spatial distribution of coral reefs in the South-Central Coast region of Viet Nam using Planetscope imagery
title_fullStr	Characterizing the spatial distribution of coral reefs in the South-Central Coast region of Viet Nam using Planetscope imagery
title_full_unstemmed	Characterizing the spatial distribution of coral reefs in the South-Central Coast region of Viet Nam using Planetscope imagery
title_sort	characterizing the spatial distribution of coral reefs in the south-central coast region of viet nam using planetscope imagery
publisher	PeerJ Inc.
publishDate	2021
url	https://doaj.org/article/c046092654604c54a5f9939c6cff49a8
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Characterizing the spatial distribution of coral reefs in the South-Central Coast region of Viet Nam using Planetscope imagery

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