Digital Shoreline Analysis System version 4.3 transects and long-term linear regression shoreline change statistics without shorelines from 1970-1979 and 1994 within the Cape Cod Bay coastal region from the Cape Cod Canal in Sandwich to Long Point in Provincetown (CapeCodBay_transects_rates_LTwo.sh

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) 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).受沿海人口持续增长与海岸侵蚀威胁加剧影响，当前亟需海岸线移动趋势与速率的相关数据，以支撑海岸线与洪泛区管理工作。马萨诸塞州沿海地带管理办公室（Massachusetts Office of Coastal Zone Management）于1989年启动海岸线变化项目，旨在识别沿海易侵蚀区域。2001年，该项目补充了1994年的海岸线数据，用于计算马萨诸塞州沿海面向大洋区段每40米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）沿海与海洋地质项目组与马萨诸塞州沿海地带管理办公室合作，依托《2013年马萨诸塞州海岸线变化制图与分析项目更新》整编了马萨诸塞州无遮蔽沿海区段的可靠历史海岸线数据集。马萨诸塞州的两条滨海海岸线（总长约1800千米）分别通过两种方式获取：其一，借助2008/2009年彩色航空正射影像（color aerial orthoimagery）勾绘划定；其二，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。新获取的海岸线数据已与马萨诸塞州沿海地带管理办公室及USGS现有的历史海岸线数据整合，以便借助最新版数字海岸线分析系统（Digital Shoreline Analysis System, DSAS）计算海岸线长期与短期变化速率。