%PDF-1.4 % 1 0 obj << /Type /Pages /Count 1 /Kids [ 2 0 R ] >> endobj 2 0 obj << /Type /Page /Parent 1 0 R /Resources << /ProcSet [ /PDF /Text /ImageB /ImageC /ImageI ] /Font << /QuickPDFFb4ccd934 69 0 R /QuickPDFF22428faa 116 0 R >> >> /Contents [ 5 0 R ] /MediaBox [ 0 0 595.2756 841.8898 ] /CropBox [ 0 0 595.2756 841.8898 ] >> endobj 3 0 obj << /Type /Catalog /Pages 1 0 R /Metadata 117 0 R >> endobj 4 0 obj << /Producer (Debenu Quick PDF Library 11.15 \(www.debenu.com\)) /Creator (Debenu Quick PDF Library 11.15 \(www.debenu.com\)) /CreationDate (D:20170615105944+02'00') /ModDate (D:20170615105944+02'00') >> endobj 5 0 obj << /Length 2872 /LC /iSQP >> stream 0 Tr /QuickPDFF22428faa 14 Tf 0 0 0 rg 100 Tz 0 Tw 0 Tc 0 Ts BT 1 0 0 1 86.8678 770.8329 Tm (Semi-Buried Seabed Object Detection: Sonar vs. Geophysical Methods)Tj ET /QuickPDFF22428faa 11 Tf 0 0 0 rg BT 1 0 0 1 44.9733 731.3912 Tm (Dino Dragun \(Croatia\), Lieselot Noppe, Pierre Serpe \(Belgium\), Emeline Caron and Astrid Robert \(France\))Tj ET /QuickPDFF22428faa 12 Tf 0 0 0 rg BT 1 0 0 1 56.6929 689.6683 Tm 15.996 TL (Key words: )' ET /QuickPDFFb4ccd934 12 Tf 0 0 0 rg BT 1 0 0 1 141.7323 689.6683 Tm 15.768 TL (Hydrography; site investigation; sonar methods; geophysical methods; object)' (detection)' ET /QuickPDFF22428faa 12 Tf 0 0 0 rg BT 1 0 0 1 56.6929 647.1486 Tm 15.996 TL (SUMMARY)' ET /QuickPDFFb4ccd934 12 Tf 0 0 0 rg BT 1 0 0 1 56.6929 618.8021 Tm 15.768 TL (A hydrographic survey is used to measure and analyse a body of water for a specific purpose, such)' (as seabed mapping for safe navigation, subsea structure construction and pipeline and cable)' (routing...)' ()' (Several hydrographic survey methods were utilized in order to determine the status of a)' (semi-buried seabed object.)' ()' (This paper deals with the site investigation processes of detecting a semi-buried object using)' (multibeam echosounder, side scan sonar and magnetometer data. There are pros and cons of sonar)' (\(multibeam echosounder and side scan sonar\) and geophysical methods \(magnetometer\) for this)' (purpose of survey. )' ()' (Since the object is semi-buried, both buried and exposed parts were expected to be detected using a)' (geophysical method. On seabed sections were expected to be visible during interpretation of sonar)' (data.)' ()' (Migrating sand waves caused the object visibility to change over time. Several surveys were)' (completed during one year and the object exposed itself each time on different locations.)' ()' (The primary use of the magnetometer is to provide evidence of the existence of ferrous material on)' (or below the seafloor. The magnetometer data did not provide usable data due to the presence of a)' (large structure in surrounding area. Therefore, it was necessary to rely on sonar survey methods in)' (order to detect the semi-buried seabed object. A comparison in acquisition, processing and data)' (interpretation between geophysical and sonar survey methods has been presented and explained.)' ET /QuickPDFFb4ccd934 10 Tf 0 0 0 rg BT 1 0 0 1 56.6929 150.7097 Tm 13.14 TL (__________________________________________________________________________________________)' ()' (Semi-Buried Seabed Object Detection: Sonar vs. Geophysical Methods \(9102\))' (Dino Dragun \(Croatia\), Lieselot Noppe, Pierre Serpe \(Belgium\), Emeline Caron and Astrid Robert \(France\))' ()' (FIG Working Week 2017)' (Surveying the world of tomorrow - From digitalisation to augmented reality)' (Helsinki, Finland, May 29June 2, 2017)' ET endstream endobj 6 0 obj << /Length 316 /Filter /FlateDecode >> stream xMRKnCAۿSpk`y^Uu[jIɒT%C/:b}Rx\%=
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