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The National Assessment of Coastal Change Hazards project derives features of beach morphology from lidar elevation data for the purpose of understanding and predicting storm impacts to our nation's coastlines. This dataset defines mean beach slopes along the United States Northeast Atlantic Ocean for Massachusetts for data collected at various times between 2000 and 2013. For further information regarding data collection and/or processing methods refer to USGS Open-File Report 2015?1053 (http://pubs.usgs.gov/of/2015/1053/).