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Paper Abstract and Keywords
Presentation 2023-08-03 11:35
A method for analyzing chlorophyll-a concentration in the seawater surface layer by image hue analysis.
Shunya Kosako, Toshihiko Hamasaki (HIT)
Abstract (in Japanese) (See Japanese page) 
(in English) Satellite remote sensing has been widely used to observe chlorophyll-a concentrations in the ocean, but it is difficult to accurately estimate chlorophyll-a concentrations in bays and lakes, where the environment is more complex than in the open ocean. We have developed an inexpensive and compact IoT buoy that can capture images of the underwater sea surface layer in Hiroshima Bay without being affected by atmospheric or sea surface reflections. We obtained images of chlorophyll-a concentration and the underwater sea surface layer at 13 locations in Hiroshima Bay, and derived a third-order polynomial for estimating chlorophyll-a concentration from the images by correcting the RGB values of the images using the ratio of R and G values. As a result, the root mean square error (RMSE) before and after correction was 2.095 µg/L and 1.407 µg/L, respectively, indicating improved estimation accuracy. Comparison of the estimated and measured chlorophyll-a concentrations by JAXA's Shikisai satellite showed that the accuracy varied greatly depending on the ocean area.
Keyword (in Japanese) (See Japanese page) 
(in English) IoT Buoys / Chlorophyll concentration / Satellite remote sensing / Hiroshima Bay / / / /  
Reference Info. ITE Tech. Rep., vol. 47, no. 22, IST2023-34, pp. 21-26, Aug. 2023.
Paper # IST2023-34 
Date of Issue 2023-07-25 (IST) 
ISSN Online edition: ISSN 2424-1970
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Conference Information
Conference Date 2023-08-01 - 2023-08-03 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English) Analog, Mixed Analog and Digital, RF, and Sensor Interface, Low Voltage/Low Power Techniques, Novel Devices/Circuits, and the Applications 
Paper Information
Registration To IST 
Conference Code 2023-08-ICD-SDM-IST 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A method for analyzing chlorophyll-a concentration in the seawater surface layer by image hue analysis. 
Sub Title (in English)  
Keyword(1) IoT Buoys  
Keyword(2) Chlorophyll concentration  
Keyword(3) Satellite remote sensing  
Keyword(4) Hiroshima Bay  
1st Author's Name Shunya Kosako  
1st Author's Affiliation Hiroshima Institute of Technology (HIT)
2nd Author's Name Toshihiko Hamasaki  
2nd Author's Affiliation Hiroshima Institute of Technology (HIT)
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Speaker Author-1 
Date Time 2023-08-03 11:35:00 
Presentation Time 25 minutes 
Registration for IST 
Paper # IST2023-34 
Volume (vol) vol.47 
Number (no) no.22 
Page pp.21-26 
Date of Issue 2023-07-25 (IST) 

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