Open Digital Shoreline Analysis System: ODSAS v1.0

In this study, we propose a new baseline and transect method, the open-source digital shoreline analysis system (ODSAS), which is specifically designed to deal with very irregular coastlines. We have compared the ODSAS results with those obtained using the digital shoreline analysis system (DSAS). L...

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Bibliographic Details
Published in:Journal of marine science and engineering 2022-01, Vol.10 (1), p.26
Main Authors: Gómez-Pazo, Alejandro, Payo, Andres, Paz-Delgado, María Victoria, Delgadillo-Calzadilla, Miguel A.
Format: Article
Language:English
Subjects:
Analysis
CliffMetrics
coastal variation
CoastCR
Coasts
DSAS
Freeware
Geographic information systems
Geographical information systems
Open source software
ProfileCrossings
SAGA
Sea level
Shorelines
Software
User services
Workflow
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Summary:In this study, we propose a new baseline and transect method, the open-source digital shoreline analysis system (ODSAS), which is specifically designed to deal with very irregular coastlines. We have compared the ODSAS results with those obtained using the digital shoreline analysis system (DSAS). Like DSAS, our proposed method uses a single baseline parallel to the shoreline and offers the user different smoothing and spacing options to generate the transects. Our method differs from DSAS in the way that the transects’ starting points and orientation are delineated by combining raster and vector objects. ODSAS uses SAGA GIS and R, which are both free open-source software programs. In this paper, we delineate the ODSAS workflow, apply it to ten study sites along the very irregular Galician coastline (NW Iberian Peninsula), and compare it with the one obtained using DSAS. We show how ODSAS produces similar values of coastline changes in terms of the most common indicators at the aggregated level (i.e., using all transects), but the values differ when compared at the transect-by-transect level. We argue herein that explicitly requesting the user to define a minimum resolution is important to reduce the subjectivity of the transect and baseline method.
ISSN:2077-1312
2077-1312
DOI:10.3390/jmse10010026