Digital Shoreline Analysis System version 4.3 shoreline intersection points used to calculate long-term shoreline change statistics for the Outer Cape Cod coastal region from Long Point in Provincetown to Monomoy Island (OuterCapeCod_intersects_LTw.shp)

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).

受持续增长的沿海人口规模与愈发严峻的海岸侵蚀威胁影响，当前亟需海岸线动态趋势与变化速率的相关数据，以支撑海岸线与洪泛区的管理工作。1989年，马萨诸塞州海岸带管理办公室（Massachusetts Office of Coastal Zone Management）启动海岸线变化项目，旨在识别沿海易受侵蚀区域。2001年，项目补充了1994年的海岸线数据，用于计算马萨诸塞州沿海临洋区段以40米为间隔的长期与短期海岸线变化速率。

美国地质调查局（U.S. Geological Survey, USGS）海岸与海洋地质项目组与马萨诸塞州海岸带管理办公室合作，依托《2013年马萨诸塞州海岸线变化制图与分析项目更新》，完成了马萨诸塞州沿海开阔区段可靠历史海岸线数据的汇编工作。该项目共生成两条总计长度约1800千米的马萨诸塞州滨海海岸线：其一通过2008/2009年彩色航空正射影像完成边界勾绘，其二则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）数据集中提取得到。研究团队将新生成的海岸线数据与马萨诸塞州海岸带管理办公室及美国地质调查局已有的历史海岸线数据进行整合，依托最新版海岸线数字分析系统（Digital Shoreline Analysis System, DSAS）计算得到长期与短期海岸线变化速率。