Using Modern Photogrammetric Techniques to Map Historical Shorelines and Analyze Shoreline Change Rates: Case Study on Bodie Island, North Carolina.

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dc.contributor.advisor Margery Overton, Committee Chair en_US Zink, Jason Michael en_US 2010-04-02T18:16:56Z 2010-04-02T18:16:56Z 2003-12-27 en_US
dc.identifier.other etd-12192002-155357 en_US
dc.description.abstract The efficacy of coastal development regulations in North Carolina is dependent on accurately calculated shoreline erosion rates. North Carolina's current methodology for regulatory erosion rate calculation does not take advantage of emerging GIS, photogrammetric, and engineering technologies. Traditionally, historical shoreline positions from a database created in the 1970s have been coupled with a modern shoreline position to calculate erosion rates. The photos from which these historical shorelines come were subject to errors of tilt, variable scale, lens distortion, and relief displacement. Most of these errors could be removed using modern photogrammetric methods. In this study, an effort was made to acquire and rectify, using digital image processing, prints of the original historical photography for Bodie Island, North Carolina. The photography was rectified using the latest available desktop photogrammetry technology. Digitized shorelines were then compared to shorelines of similar date created without the benefit of this modern technology. Uncertainty associated with shoreline positions was documented throughout the process. It was found that the newly created shorelines were significantly different than their counterparts created with analog means. Many factors caused this difference, including: choice of basemaps, number of tie points between photos, quality of ground control points, method of photo correction, and shoreline delineation technique. Using both linear regression and the endpoint method, a number of erosion rates were calculated with the available shorelines. Despite the differences in position of shorelines of the same date, some of the calculated erosion rates were not significantly different. Specifically, the rate found using all available shorelines prior to this study was very similar to the rate found using all shorelines created in this study. As a result of this and other factors, it was concluded that a complete reproduction of North Carolina's historical shoreline database may not be warranted. The new rectification procedure does have obvious value, and should be utilized in those locations where there is no existing historical data, or where existing data is thought to be of poor quality. This would especially be the case near inlets or other historically unpopulated areas. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject shoreline en_US
dc.subject aerial photography en_US
dc.subject GIS en_US
dc.subject erosion rates en_US
dc.title Using Modern Photogrammetric Techniques to Map Historical Shorelines and Analyze Shoreline Change Rates: Case Study on Bodie Island, North Carolina. en_US MS en_US thesis en_US Civil Engineering en_US

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