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Remote Sens. 2018, 10(9), 1478; https://doi.org/10.3390/rs10091478

Improved Detection of Tiny Macroalgae Patches in Korea Bay and Gyeonggi Bay by Modification of Floating Algae Index

1
Marine Security & Safety Research Center, Korea Institute of Ocean Science & Technology, Busan 49111, Korea
2
Integrated Ocean Sciences, University of Science & Technology, Daejeon 34113, Korea
3
Department of Convergence Study on the Ocean Science and Technology, Ocean Science and Technology School, Korea Maritime and Ocean University, Busan 49111, Korea
*
Author to whom correspondence should be addressed.
Received: 26 July 2018 / Revised: 28 August 2018 / Accepted: 1 September 2018 / Published: 16 September 2018
(This article belongs to the Special Issue Remote Sensing of Ocean Colour)
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Abstract

This work focuses on the detection of tiny macroalgae patches in the eastern parts of the Yellow Sea (YS) using high-resolution Landsat-8 images from 2014 to 2017. In the comparison between floating algae index (FAI) and normalized difference vegetation index (NDVI) better detection by FAI was observed, but many tiny patches still remained undetected. By applying a modification on the FAI around 12% to 27% increased and correct detection of macroalgae is achieved from 35 images compared to the original. Through this method many scattered tiny patches were detected in June or July in Korea Bay and Gyeonggi Bay. Though it was a small-scale phenomenon they occurred in the similar period of macroalgal bloom occurrence in the YS. Thus, by using this modified method we could detect macroalgae in the study areas around one month earlier than the previously used Geostationary Ocean Color Imager NDVI-based detection. Later, more macroalgae patches including smaller ones occupying increased areas were detected. Thus, it seems that those macroalgae started growing locally from tiny patches rather than being transported from the western parts of the YS. Therefore, this modified FAI could be used for the precise detection of macroalgae. View Full-Text
Keywords: macroalgal bloom; Landsat-8; floating algae index (FAI); Korea Bay; Gyeonggi Bay macroalgal bloom; Landsat-8; floating algae index (FAI); Korea Bay; Gyeonggi Bay
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Harun-Al-Rashid, A.; Yang, C.-S. Improved Detection of Tiny Macroalgae Patches in Korea Bay and Gyeonggi Bay by Modification of Floating Algae Index. Remote Sens. 2018, 10, 1478.

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