Shoreline Change Analysis: Deriving Shorelines from Lidar
Lidar data can be used to derive  a shoreline that is tied to a single specific tidal datum elevation.  The following tool by NOAA provides you steps to guide you through the processes to create a datum-based shoreline.

USGS Coastal Change Hazards Portal
This map provides coastal managers with actionable information to make decisions to avoid, mitigate, or adapt to future hazards: extreme storms, shoreline change, and sea level rise.

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