Mean High Water Shoreline USGS

The Historic High Water Shorelines and Shoreline Rates of Change Transects are provided by MassCZM's 'Shoreline Change Project'. Please read their info carefully to fully understand how to interpret this data and know the accuracy associated with the long-term rate of change and the short-term rate of change. The USGS delineated the Mean High Water shoreline based on data collected in 2012 and 2013. This data was just released in 2018. Several USGS reports describe the various methodologies used to create this data. Profile Method Profile Method 2013 Contour Method Since the USGS shoreline data for Martha's Vineyard and the Elizabeth Islands was not presented as one continuous shoreline (given varying processing techniques) the MVC merged the 3 datasets together for ease of cartographic display. The attribute table indicates the original source file.