Uncertainty table for lidar-derived shorelines used when calculating rates in the Digital Shoreline Analysis System software for the Cape Cod region from Provincetown to the southern end of Monomoy Island, Massachusetts (OuterCapeCod_shorelines_uncertainty.dbf)

Due to continued coastal population growth and increased threats of erosion, current data on trends and rates of shoreline movement are required to inform shoreline and floodplain management. The Massachusetts Office of Coastal Zone Management launched the Shoreline Change Project in 1989 to identify erosion-prone areas of the coast. In 2001, a 1994 shoreline was added to calculate both long- and short-term shoreline change rates at 40-meter intervals along ocean-facing sections of the Massachusetts coast.

The Coastal and Marine Geology Program of the U.S. Geological Survey (USGS) in cooperation with the Massachusetts Office of Coastal Zone Management, has compiled reliable historical shoreline data along open-facing sections of the Massachusetts coast under the Massachusetts Shoreline Change Mapping and Analysis Project 2013 Update. Two oceanfront shorelines for Massachusetts (approximately 1,800 km in total length) were (1) delineated using 2008/09 color aerial orthoimagery, and (2) extracted from topographic LIDAR datasets (2007) obtained from NOAA's Ocean Service, Coastal Services Center. The new shorelines were integrated with existing Massachusetts Office of Coastal Zone Management and USGS historical shoreline data in order to compute long- and short-term rates using the latest version of the Digital Shoreline Analysis System (DSAS).

由于沿海人口持续增长，海岸侵蚀威胁日益加剧，亟需获取岸线移动趋势与速率的最新数据，为岸线及洪泛区管理提供决策支撑。马萨诸塞州海岸带管理办公室（Massachusetts Office of Coastal Zone Management）于1989年启动岸线变化项目（Shoreline Change Project），旨在识别海岸易侵蚀区域。2001年，该项目纳入1994年的岸线数据，以沿马萨诸塞州海岸面向海洋的区段，以40米为间隔计算长期与短期岸线变化速率。

美国地质调查局（U.S. Geological Survey, USGS）海岸与海洋地质计划（Coastal and Marine Geology Program）与马萨诸塞州海岸带管理办公室合作，依托《马萨诸塞州岸线变化制图与分析项目2013年更新版》，对马萨诸塞州面向开阔海域区段的可靠历史岸线数据进行了汇编。马萨诸塞州的两条滨海岸线（总长度约1800千米）分别通过两种方式获取：① 利用2008/2009年彩色航空正射影像进行描绘；② 从美国国家海洋和大气管理局（NOAA）海洋服务局海岸服务中心获取的2007年地形激光雷达（LiDAR）数据集提取得到。研究团队将新获取的岸线数据与马萨诸塞州海岸带管理办公室及USGS已有的历史岸线数据进行整合，借助最新版数字岸线分析系统（Digital Shoreline Analysis System, DSAS）计算长期与短期岸线变化速率。