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http://dx.doi.org/10.7780/kjrs.2018.34.2.2.6

Red Tide Detection through Image Fusion of GOCI and Landsat OLI  

Shin, Jisun (Korea Ocean Satellite Center, Korea Institute of Ocean Science & Technology)
Kim, Keunyong (Korea Ocean Satellite Center, Korea Institute of Ocean Science & Technology)
Min, Jee-Eun (Earth Science Division, NASA Ames Research Center)
Ryu, Joo-Hyung (Korea Ocean Satellite Center, Korea Institute of Ocean Science & Technology)
Publication Information
Korean Journal of Remote Sensing / v.34, no.2_2, 2018 , pp. 377-391 More about this Journal
Abstract
In order to efficiently monitor red tide over a wide range, the need for red tide detection using remote sensing is increasing. However, the previous studies focus on the development of red tide detection algorithm for ocean colour sensor. In this study, we propose the use of multi-sensor to improve the inaccuracy for red tide detection and remote sensing data in coastal areas with high turbidity, which are pointed out as limitations of satellite-based red tide monitoring. The study area were selected based on the red tide information provided by National Institute of Fisheries Science, and spatial fusion and spectral-based fusion were attempted using GOCI image as ocean colour sensor and Landsat OLI image as terrestrial sensor. Through spatial fusion of the two images, both the red tide of the coastal area and the outer sea areas, where the quality of Landsat OLI image was low, which were impossible to observe in GOCI images, showed improved detection results. As a result of spectral-based fusion performed by feature-level and rawdata-level, there was no significant difference in red tide distribution patterns derived from the two methods. However, in the feature-level method, the red tide area tends to overestimated as spatial resolution of the image low. As a result of pixel segmentation by linear spectral unmixing method, the difference in the red tide area was found to increase as the number of pixels with low red tide ratio increased. For rawdata-level, Gram-Schmidt sharpening method estimated a somewhat larger area than PC spectral sharpening method, but no significant difference was observed. In this study, it is shown that coastal red tide with high turbidity as well as outer sea areas can be detected through spatial fusion of ocean colour and terrestrial sensor. Also, by presenting various spectral-based fusion methods, more accurate red tide area estimation method is suggested. It is expected that this result will provide more precise detection of red tide around the Korean peninsula and accurate red tide area information needed to determine countermeasure to effectively control red tide.
Keywords
Red tide; GOCI; Landsat OLI; Spatial fusion; Spectral-based fusion;
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Times Cited By KSCI : 5  (Citation Analysis)
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