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A New 3-d Modelling Method to Extract Subtransect Dimensions from Underwater Videos : Volume 9, Issue 2 (16/04/2013)

By Fillinger, L.

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Book Id: WPLBN0004020656
Format Type: PDF Article :
File Size: Pages 16
Reproduction Date: 2015

Title: A New 3-d Modelling Method to Extract Subtransect Dimensions from Underwater Videos : Volume 9, Issue 2 (16/04/2013)  
Author: Fillinger, L.
Volume: Vol. 9, Issue 2
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Fillinger, L., & Funke, T. (2013). A New 3-d Modelling Method to Extract Subtransect Dimensions from Underwater Videos : Volume 9, Issue 2 (16/04/2013). Retrieved from http://www.worldlibrary.net/


Description
Description: Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Am Alten Hafen 26, 27568 Bremerhaven, Germany. Underwater video transects have become a common tool for quantitative analysis of the seafloor. However a major difficulty remains in the accurate determination of the area surveyed as underwater navigation can be unreliable and image scaling does not always compensate for distortions due to perspective and topography. Depending on the camera set-up and available instruments, different methods of surface measurement are applied, which make it difficult to compare data obtained by different vehicles. 3-D modelling of the seafloor based on 2-D video data and a reference scale can be used to compute subtransect dimensions. Focussing on the length of the subtransect, the data obtained from 3-D models created with the software PhotoModeler Scanner are compared with those determined from underwater acoustic positioning (ultra short baseline, USBL) and bottom tracking (Doppler velocity log, DVL). 3-D model building and scaling was successfully conducted on all three tested set-ups and the distortion of the reference scales due to substrate roughness was identified as the main source of imprecision. Acoustic positioning was generally inaccurate and bottom tracking unreliable on rough terrain. Subtransect lengths assessed with PhotoModeler were on average 20% longer than those derived from acoustic positioning due to the higher spatial resolution and the inclusion of slope. On a high relief wall bottom tracking and 3-D modelling yielded similar results. At present, 3-D modelling is the most powerful, albeit the most time-consuming, method for accurate determination of video subtransect dimensions.

Summary
A new 3-D modelling method to extract subtransect dimensions from underwater videos

Excerpt
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