A comparison of depth sounder positioning techniques for hydrographic/bathymetric surveys

Strahley, Matthew (2011) A comparison of depth sounder positioning techniques for hydrographic/bathymetric surveys. [USQ Project]

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Abstract

Techniques used for Hydrographic surveys have significantly progressed from early Lead Line techniques to the utilisation of soundings for determining the depth of a submerged surface. To allow for the formation of the digital terrain model (DTM) of the submerged surface the XYZ position of a recorded sounding must be determined through remotely positioning a depth sounding device in order to achieve a relationship between each of the soundings. There are three common methods utilised in Hydrographic surveys to achieve this: GPS; Robotic Total Station; and GPS coupled with Tidal Height Datum methods. This dissertation provides an investigation of the use of different techniques of positioning a digital Echo sounder whilst undertaking Hydrographic or bathymetric surveys.

The methodology used for this project was based on framework established by International Federation of Surveyors (FIG). Such framework and standards covers the planning, execution and management of Hydrographic surveys. The methodology of this research involved completing a survey of an exposed tidal surface using Robotic Total Station. This surface was used as the standard of comparison. Once it became submerged, three additional surveys were completed utilising a depth sounder coupled with Robotic Total Station, RTK GPS and the Tidal Plane. For quality assurance, an additional survey using Robotic Total Station techniques was completed once the surface became exposed for a second time to ensure that the differences found between the methods and the base surface were not affected by topography changes due to tidal influences. Each of these terrain models determined from the sounding surveys were then related to the original survey, and their relationships evaluated.

Each of the methods utilising soundings created a representation of the submerged DTM surface; however, there is some uncertainty present over their height characteristics related to Australian Height Datum (AHD). Total Station methods provided the least difference from the base DTM model, with RTK GPS and Tidal/Water methods providing marginally greater difference.


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Additional Information: Bachelor of Spatial Science (Surveying) project.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Surveying and Land Information
Supervisors: Gibbings, Peter
Date Deposited: 10 Jan 2013 07:11
Last Modified: 19 Jul 2018 00:24
Uncontrolled Keywords: hydrographic survey, robotic total station technique
Fields of Research : 09 Engineering > 0909 Geomatic Engineering > 090906 Surveying (incl. Hydrographic Surveying)
URI: http://eprints.usq.edu.au/id/eprint/22693

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