Onshore/offshore baseline for Cape Cod Bay coastal region generated to calculate shoreline change rates from Cape Cod Canal in Sandwich to Long Point in Provincetown (CapeCodBay_baseline.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).

鉴于沿海人口持续增长、海岸侵蚀威胁日益加剧，当前亟需获取海岸线移动趋势与速率的相关数据，以支撑海岸线及洪泛区的管理工作。马萨诸塞州海岸带管理办公室（Massachusetts Office of Coastal Zone Management）于1989年启动了海岸线变化项目（Shoreline Change Project），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，以40米为间隔，对马萨诸塞州沿海面向大洋的区段计算长期与短期的海岸线变化速率。

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《马萨诸塞州海岸线变化制图与分析项目2013年更新版》，对马萨诸塞州沿海开阔面向海域的区段整理了可靠的历史海岸线数据集。该数据集包含两条马萨诸塞州沿海岸线（总长度约1800千米）：其一通过2008/2009年彩色航空正射影像（color aerial orthoimagery）勾绘得到，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）数据集提取而来。新海岸线数据已与马萨诸塞州海岸带管理办公室及美国地质调查局的历史海岸线数据集进行整合，以借助最新版数字海岸线分析系统（Digital Shoreline Analysis System, DSAS）计算长期与短期的海岸线变化速率。