Massachusetts Shoreline Change Project: A GIS Compilation of Vector Shorelines (1844-2018)
Dates
Publication Date
2021-08-31
Citation
Bartlett, M.K., Farris, A.S., Weber, K.M., and Himmelstoss, E.A., 2021, Massachusetts shoreline change project—A GIS compilation of vector shorelines (1844-2014): U.S. Geological Survey data release, https://doi.org/10.5066/P9O8QA8N.
Summary
The U.S. Geological Survey, in cooperation with the Massachusetts Office of Coastal Zone Management compiled Massachusetts vector shorelines into an updated dataset for the Office’s Shoreline Change Project. The Shoreline Change Project started in 1989 to identify erosion-prone areas of the Massachusetts coast by compiling a database of historical shoreline positions. Trends of shoreline position over long- and short-term timescales provide information to landowners, managers, and potential buyers about possible future changes to costal resources and infrastructure. This updated dataset strengthens the understanding of shoreline position change in Massachusetts. It includes U.S. Geological Survey vector shorelines edited for quality [...]
Summary
The U.S. Geological Survey, in cooperation with the Massachusetts Office of Coastal Zone Management compiled Massachusetts vector shorelines into an updated dataset for the Office’s Shoreline Change Project. The Shoreline Change Project started in 1989 to identify erosion-prone areas of the Massachusetts coast by compiling a database of historical shoreline positions. Trends of shoreline position over long- and short-term timescales provide information to landowners, managers, and potential buyers about possible future changes to costal resources and infrastructure. This updated dataset strengthens the understanding of shoreline position change in Massachusetts. It includes U.S. Geological Survey vector shorelines edited for quality control from the mid-1800s to 1989, 1994, 2001, 2007–9, and 2010–14; and one new shoreline from 2018.
To produce the 2018 vector shoreline, the U.S. Geological Survey analyzed lidar of the Massachusetts coastline collected by the U.S. Army Corps of Engineers. The 2018 vector shoreline was extracted by either a profile method or contour method, depending on the location of the shoreline. The study area included shorelines adjacent to Massachusetts Bay (excluding Boston Harbor), Cape Cod Bay, part of Buzzards Bay (excluding the Elizabeth Islands), Outer Cape Cod, and Nantucket Sound, including the shorelines of Martha’s Vineyard and Nantucket.
Shoreline positions serve as easily understood features that can be used to describe the movement of beaches through time. This shoreline dataset is a mean high water (MHW) datum-based shoreline extracted using both a profile method and a contour method. These data are used in conjunction with other shoreline files to calculate rates of shoreline change. Associated with this dataset is a horizontal uncertainty value for each shoreline included in the attribute table, a proxy-datum bias reference line that corrects for the unidirectional offset between the mean high water (MHW) elevation of this dataset and other historical high water line (HWL) shoreline positions at this location, and an estimate of the uncertainty of this proxy-datum bias. See the first process step for essential information to understand these data and other shoreline change related data.
Preview Image
Shoreline positions compiled for the Massachusetts coastal regions (1844-2018)