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Paper Abstract and Keywords
Presentation 2013-12-02 13:20
Detection of Underwater Laver Cultivation Fields by Synthetic Aperture Radar: Reappraisal
Kazuo Ouchi, Chan-Su Yang (KIOST) SANE2013-78
Abstract (in Japanese) (See Japanese page) 
(in English) In our previous studies, techniques were described to extract underwater laver cultivation nets from synthetic aperture radar (SAR) amplitude data and by polarimetric analyses. The principal theory is based on the phenomenon that the sea surface above the underwater nets becomes smooth in comparison with the deep water without nets. Little radar backscatter is expected from such smooth surfaces which can be distinguished from the surrounding rough surfaces. Cultivation nets can thus be extracted from amplitude data, and the measurement accuracy can be improved using polarimetric entropy since the entropy is high in the net areas of which the images are contaminated with random system noise; while the entropy is low in the surrounding sea dominated by surface scattering only. The theory was supported by the ALOS-PALSAR data of the Tokyo Bay under moderate wind speeds, where the currents are expected to be not very strong. In the present paper, we report the preliminary results of further study of extracting laver cultivation fields in the west coasts of Korea under different metrological conditions using ALOS-PALSAR. It was found that under low wind speeds of around 2-3 m/s the underwater cultivation nets are visible in PALSAR images of the areas where tidal currents are weak, but they are difficult to detect in the areas of strong currents. Under very low wind speeds below 1 m/s, almost no images corresponding to the cultivation nets are visible. From field survey, the cultivation nets are placed on the splashing level supported by ropes and floating rods, and they may be responsible for damping small-scale waves and/or preventing their propagation. Thus, this preliminary result suggests that the accuracy of extracting underwater laver cultivation nets by SAR strongly depends on the wind speed and tidal currents.
Keyword (in Japanese) (See Japanese page) 
(in English) Synthetic aperture radar / laver cultivation nets / Bragg scattering / tidal currents / ocean wind / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 335, SANE2013-78, pp. 41-46, Dec. 2013.
Paper # SANE2013-78 
Date of Issue 2013-11-25 (SANE) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee SANE  
Conference Date 2013-12-02 - 2013-12-03 
Place (in Japanese) (See Japanese page) 
Place (in English) VAST/VNSC(2nd Dec.) & Melia Hotel (3rd Dec), Hanoi, Vietnam 
Topics (in Japanese) (See Japanese page) 
Topics (in English) ICSANE 2013 (International Conference on Space, Aeronautical and Navigational Electronics) 
Paper Information
Registration To SANE 
Conference Code 2013-12-SANE 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Detection of Underwater Laver Cultivation Fields by Synthetic Aperture Radar: Reappraisal 
Sub Title (in English)  
Keyword(1) Synthetic aperture radar  
Keyword(2) laver cultivation nets  
Keyword(3) Bragg scattering  
Keyword(4) tidal currents  
Keyword(5) ocean wind  
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Keyword(8)  
1st Author's Name Kazuo Ouchi  
1st Author's Affiliation Korea Institute of Ocean Science and Technology (KIOST)
2nd Author's Name Chan-Su Yang  
2nd Author's Affiliation Korea Institute of Ocean Science and Technology (KIOST)
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Speaker Author-1 
Date Time 2013-12-02 13:20:00 
Presentation Time 20 minutes 
Registration for SANE 
Paper # SANE2013-78 
Volume (vol) vol.113 
Number (no) no.335 
Page pp.41-46 
#Pages
Date of Issue 2013-11-25 (SANE) 


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