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|a A New, Robust, and Accurate Method to Extract Tide-Coordinated Shorelines from Coastal Elevation Models |h [electronic resource] |y English. |
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|a [S.l.] : |b Coastal Education & Research Foundation, |c 2011. |
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|a Journal of Coastal Research Volume 28 Issue 3. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a The extraction of highly accurate shoreline data is fundamental to carrying out accurate and reliable studies to
enhance our understanding of coastal evolution and coastal vulnerability. In our case, shoreline extraction was needed
to develop a method based on an extrapolation process because the most suitable height for datum-coordinated
shoreline extraction along Spanish coastal areas turned out to be the orthometric datum origin, i.e., the origin of the
vertical reference system in Spain. Because of the microtidal nature of the Mediterranean Sea, using this vertical
datum is rather troublesome for remotely extracting ground points to apply to traditional shoreline-extraction methods
based on interpolation procedures. Because of these difficulties, a new method for shoreline extraction, based on
extrapolation from an iterative digital-elevation model, is presented in this article. The Elevation Gradient Trend
Propagation method employs the local elevation gradient to estimate the shoreline position by extrapolating the slope
until the zero-elevation contour, representing the modeled intersection of the vertical datum and the beach profile, is
reached.
The proposed methodology was tested on a Light Detection and Ranging (LIDAR)–derived digital-elevation model,
which comprised a coastal area of Almerı´a (Mediterranean Sea, south Spain). The results obtained from the new
approach were compared with those provided by the widely known Cross-Shore Profile (CSP) method.
A validation process was conducted for both methods to highlight their advantages and shortcomings. An alternative
contour level of 0.4 m was employed as a ground truth because the zero-elevation contour was not available because
LIDAR returns under the water surface were unavailable. The validation process showed that the proposed method was
more robust and more suitable than CSP method was for microtidal coasts and for data that need to be extrapolated to
reach the desired contour level. In addition, the influence of the starting point in applying the elevation extrapolation
process was also proven. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a Fernandez Luque, Ismael. |
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|a Aguilar Torres, Fernando J.. |
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|a Aguilar Torres, Manuel A.. |
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|a Perez Garcia, Jose L.. |
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|t A New, Robust, and Accurate Method to Extract Tide-Coordinated Shorelines from Coastal Elevation Models |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15061881/00001 |y Click here for full text |
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|3 Host material |u http://www.jcronline.org/doi/pdf/10.2112/JCOASTRES-D-11-00107.1 |y A New, Robust, and Accurate Method to Extract Tide-Coordinated Shorelines from Coastal Elevation Models |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/18/81/00001/FI15061881_thm.jpg |
