Comparative study between flat and uniform bottom assumptions for snippet imageries in hydrographic applications

The length of each snippet data varies with the ensonified area of the beam foot print, which is a function of incidence angle and water depth. Generally, the seabed topology is undulated and it is challenging to determine the exact angle of incident. Therefore the snippet is divided into two operat...

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Main Authors: R., Rubasingam, M.R, Mahmud, M.D.E.K, Gunathilaka
Format: Article
Language:English
Published: Faculty of Geoinformation and Real Estate, Universiti Teknologi Malaysia 2011
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Online Access:http://eprints.utm.my/id/eprint/27800/1/RubasingamR.2011_ComparativeStudyBetweenFlatAnd.pdf
http://eprints.utm.my/id/eprint/27800/
http://www.fksg.utm.my/journal/GSJ/GSJ%20VOL%2011%20NO%202%202011.php
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Institution: Universiti Teknologi Malaysia
Language: English
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spelling my.utm.278002012-08-10T02:21:56Z http://eprints.utm.my/id/eprint/27800/ Comparative study between flat and uniform bottom assumptions for snippet imageries in hydrographic applications R., Rubasingam M.R, Mahmud M.D.E.K, Gunathilaka Unspecified The length of each snippet data varies with the ensonified area of the beam foot print, which is a function of incidence angle and water depth. Generally, the seabed topology is undulated and it is challenging to determine the exact angle of incident. Therefore the snippet is divided into two operational modes; uniform and flat bottom in order to cope with the complexity of the seabed. However, these assumptions are invalid in real situations most of the time. This study focuses on comparing these two bottom assumption techniques in bottom classification and coverage accuracy using the RESON Seabat 8124 multibeam system at Johor Bahru, Malaysia. Comparative analysis were carried out using hit counts and data gaps interpretation for geometric distortions, intensity profiles and volume comparisons for radiometric distortions in the classified mosaic seabed imagery. Both modes gave a mean difference of 0.54 intensity units on flat seabed areas and 5.97 units on the slope. The data density of the uniform mode is also high. This concludes that one may use either technique for flat areas. But for undulated areas, one has to be careful in selecting the snippet modes, as the real seabed is not completely flat or uniformly sloped. Faculty of Geoinformation and Real Estate, Universiti Teknologi Malaysia 2011 Article PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/27800/1/RubasingamR.2011_ComparativeStudyBetweenFlatAnd.pdf R., Rubasingam and M.R, Mahmud and M.D.E.K, Gunathilaka (2011) Comparative study between flat and uniform bottom assumptions for snippet imageries in hydrographic applications. Geoinformation Science Journal, 11 (2). pp. 41-51. ISSN 1511-9491 http://www.fksg.utm.my/journal/GSJ/GSJ%20VOL%2011%20NO%202%202011.php
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic Unspecified
spellingShingle Unspecified
R., Rubasingam
M.R, Mahmud
M.D.E.K, Gunathilaka
Comparative study between flat and uniform bottom assumptions for snippet imageries in hydrographic applications
description The length of each snippet data varies with the ensonified area of the beam foot print, which is a function of incidence angle and water depth. Generally, the seabed topology is undulated and it is challenging to determine the exact angle of incident. Therefore the snippet is divided into two operational modes; uniform and flat bottom in order to cope with the complexity of the seabed. However, these assumptions are invalid in real situations most of the time. This study focuses on comparing these two bottom assumption techniques in bottom classification and coverage accuracy using the RESON Seabat 8124 multibeam system at Johor Bahru, Malaysia. Comparative analysis were carried out using hit counts and data gaps interpretation for geometric distortions, intensity profiles and volume comparisons for radiometric distortions in the classified mosaic seabed imagery. Both modes gave a mean difference of 0.54 intensity units on flat seabed areas and 5.97 units on the slope. The data density of the uniform mode is also high. This concludes that one may use either technique for flat areas. But for undulated areas, one has to be careful in selecting the snippet modes, as the real seabed is not completely flat or uniformly sloped.
format Article
author R., Rubasingam
M.R, Mahmud
M.D.E.K, Gunathilaka
author_facet R., Rubasingam
M.R, Mahmud
M.D.E.K, Gunathilaka
author_sort R., Rubasingam
title Comparative study between flat and uniform bottom assumptions for snippet imageries in hydrographic applications
title_short Comparative study between flat and uniform bottom assumptions for snippet imageries in hydrographic applications
title_full Comparative study between flat and uniform bottom assumptions for snippet imageries in hydrographic applications
title_fullStr Comparative study between flat and uniform bottom assumptions for snippet imageries in hydrographic applications
title_full_unstemmed Comparative study between flat and uniform bottom assumptions for snippet imageries in hydrographic applications
title_sort comparative study between flat and uniform bottom assumptions for snippet imageries in hydrographic applications
publisher Faculty of Geoinformation and Real Estate, Universiti Teknologi Malaysia
publishDate 2011
url http://eprints.utm.my/id/eprint/27800/1/RubasingamR.2011_ComparativeStudyBetweenFlatAnd.pdf
http://eprints.utm.my/id/eprint/27800/
http://www.fksg.utm.my/journal/GSJ/GSJ%20VOL%2011%20NO%202%202011.php
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