Computers & Geosciences 41, (2012) 199–207
Chester W. Jackson Jr., Clark R. Alexander, and David M.Bush
“The AMBUR (Analyzing Moving Boundaries Using R) package for the R software environment provides a collection of functions for assisting with analyzing and visualizing historical shoreline change. The package allows import and export of geospatial data in ESRI shapeﬁle format, which is compatible with most commercial and open-source GIS software. The ‘‘baseline and transect’’ method is the primary technique used to quantify distances and rates of shoreline movement, and to detect classification changes across time. Along with the traditional ‘‘perpendicular’’ transect method, two new transect methods, ‘‘near’’ and ‘‘ﬁltered,’’ assist with quantifying changes along curved shorelines that are problematic for perpendicular transect methods. Output from the analyses includes data tables, graphics, and geospatial data, which are useful in rapidly assessing trends and potential errors in the dataset.
“A forecasting function also allows the user to estimate the future location of the shoreline and store the results in a shapeﬁle. Other utilities and tools provided in the package assist with preparing and manipulating geospatial data, error checking, and generating supporting graphics and shapeﬁles. The package can be customized to perform additional statistical, graphical, and geospatial functions, and, it is capable of analyzing the movement of any boundary (e.g., shorelines, glacier terminus, ﬁre edge, and marine and terrestrial ecozones).”
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