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2011 profile-derived mean high water shorelines of the Outer Cape of MA used in shoreline change analysis

Dates

Publication Date
Time Period
2014-04-13

Citation

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, https://doi.org/10.5066/P9O7S72B.

Summary

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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Attached Files

Click on title to download individual files attached to this item.

Shapefile: OuterCape_pShoreline_2011.zip
OuterCape_pShoreline_2011.CPG 5 Bytes
OuterCape_pShoreline_2011.dbf 3.86 KB
OuterCape_pShoreline_2011.prj 145 Bytes
OuterCape_pShoreline_2011.sbn 324 Bytes
OuterCape_pShoreline_2011.sbx 132 Bytes
OuterCape_pShoreline_2011.shp 92.96 KB
OuterCape_pShoreline_2011.shx 268 Bytes
OuterCape_pShoreline_2011_browse.png
“Browse graphic of the shoreline dataset.”
thumbnail 7.49 KB
OuterCape_pShoreline_2011.shp.html
“CSDGM metadata in HTML format for the shoreline data.”
76.46 KB
OuterCape_pShoreline_2011.shp.txt
“CSDGM metadata in TEXT format for the shoreline data.”
36.87 KB

Purpose

This mean high water (MHW) datum-based shoreline dataset was extracted using a profile method. The profile method for extracting shorelines was developed for open-ocean coasts. Shoreline positions serve as easily understood features that can be used to describe the movement of beaches through time. These data are combined with other shoreline positions and used to calculate rates of shoreline change. When this datum-based MHW shoreline is compared to historic proxy-based high water line shorelines there may be some artificial seaward offset of the historic data that is a known unidirectional offset between proxy-based and datum-based shoreline features. This shoreline data has an associated uncertainty table that quantifies the measurement and positional errors associated with this lidar shoreline, a proxy-datum bias value that corrects for the unidirectional offset between the mean high water (MHW) elevation of the lidar and the high water line (HWL) shorelines, as well as a measurement uncertainty in the total water level.

Additional Information

Shapefile Extension

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