USGS Digital Shoreline Analysis System

Developed by the U.S. Geological Survey, the Digital Shoreline Analysis System (DSAS) is computer software that calculates shoreline rate-of-change statistics from multiple shoreline positions to analyze historic shoreline change. 

DSAS is being used as part of the National Assessment of Shoreline Change Project to calculate rates of long-term and short-term shoreline change along open-ocean sandy shores of the conterminous U.S. and parts of Alaska and Hawaii. A primary goal of this work is to develop standardized methods for mapping and analyzing shoreline movement so that internally consistent updates can periodically be made to record shoreline erosion and accretion.

This tool is hosted on the NOAA Coastal Services Center's Digital Coast website. Please visit this site for more coastal mapping and modeling tools.


If you have any trouble accessing the website link above, please find here an archived page. You may find this has limited use. 


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  • Mapping tool


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