SouthShore_transects_rates_STlr.shp - Digital Shoreline Analysis System version 4.3 transects and short-term (1970-2009) linear regression shoreline change statistics for the South Shore coastal region from Hewitts Cove in Hingham to the Cape Cod Canal in Sandwich

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).

受持续增长的沿海人口规模与日益严峻的海岸侵蚀威胁影响，当前亟需获取海岸线移动趋势及速率的相关数据，以支撑海岸线与洪泛区的管理决策。美国马萨诸塞州海岸带管理办公室（Massachusetts Office of Coastal Zone Management）于1989年启动海岸线变化项目（Shoreline Change Project），旨在识别沿海易受侵蚀区域。2001年，该项目新增1994年的海岸线数据，用于沿马萨诸塞州面向大洋的海岸区段按40米间隔计算海岸线的长期与短期变化速率。
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区段的历史海岸线数据整编得到可靠数据集。该数据集包含两条总长约1800千米的马萨诸塞州沿海岸线：一条通过2008至2009年的彩色航空正射影像（color aerial orthoimagery）完成轮廓勾勒，另一条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提供的2007年地形LIDAR数据集（topographic LIDAR datasets）中提取得到。研究人员将新绘制的海岸线与马萨诸塞州海岸带管理办公室及美国地质调查局现存的历史海岸线数据进行整合，借助最新版数字海岸线分析系统（Digital Shoreline Analysis System, DSAS）计算海岸线的长期与短期变化速率。