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Uncertainty table for lidar-derived shorelines used when calculating rates in the Digital Shoreline Analysis System software for the South Shore of MA


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Himmelstoss, E.A., Farris, A.S., and Weber, K.M., 2018, Massachusetts shoreline change project—A GIS compilation of vector shorelines for the 2018 update: U.S. Geological Survey data release,


The Massachusetts Office of Coastal Zone Management launched the Shoreline Change Project in 1989 to identify erosion-prone areas of the coast. The shoreline position and change rate are used to inform management decisions regarding the erosion of coastal resources. In 2001, a 1994 shoreline was added to calculate both long- and short-term shoreline change rates at 40-meter intervals along ocean-facing sections of the Massachusetts coast. In 2013 two oceanfront shorelines for Massachusetts were added using 2008-2009 color aerial orthoimagery and 2007 topographic lidar datasets obtained from NOAA's Ocean Service, Coastal Services Center. This 2018 update includes two new mean high water (MHW) shorelines for the Massachusetts coast extracted [...]


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“Uncertainty table”
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“CSDGM metadata in HTML format for the uncertainty table.”
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“CSDGM metadata in TEXT format for the uncertainty table.”
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This table includes: measurement and positional errors associated with the 2011 and 2013-2014 lidar shoreline for the South Shore of Massachusetts, a proxy-datum bias value that corrects for the unidirectional offset between the mean high water (MHW) elevation of the lidar and other high water line (HWL) shorelines, as well as a measurement uncertainty in the total water level. The dataset contains a common attribute with the M-values stored for the lidar data within the SouthShore_pShoreline_2011.shp and SouthShore_pShoreline_2013_14.shp. These data are used in conjunction with the shoreline files to calculate rates of shoreline change.

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