Landsat satellite imagery, Assateague Island to Metompkin Island, Maryland and Virginia, 1984 to 2014

The U.S. Geological Survey has a long history of responding to and documenting the impacts of storms along the Nation’s coasts and incorporating these data into storm impact and coastal change vulnerability assessments. These studies, however, have traditionally focused on sandy shorelines and sandy barrier-island systems, without consideration of impacts to coastal wetlands. The goal of the Barrier Island and Estuarine Wetland Physical Change Assessment project is to integrate a wetland-change assessment with existing coastal-change assessments for the adjacent sandy dunes and beaches, initially focusing on Assateague Island along the Maryland and Virginia coastline. Assateague Island was impacted by waves and storm surge associated with the passage of Hurricane Sandy in October 2012, including erosion and overwash along the ocean-facing sandy shoreline as well as erosion and overwash deposition in the back-barrier and estuarine bay environments. This report serves as an archive of data that were derived from Landsat 5 and Landsat 8 imagery from 1984 to 2014, including wetland and terrestrial habitat extents; open-ocean, back-barrier, and estuarine mainland shoreline positions; and sand-line positions along the estuarine mainland and barrier shorelines from Assateague Island, Maryland to Metompkin Island, Virginia. The geographic information system data files with accompanying formal Federal Geographic Data Committee (FGDC) metadata can be downloaded from http://pubs.usgs.gov/ds/0968/ds968_data.html.美国地质调查局（U.S. Geological Survey）长期以来致力于响应并记录全美沿海风暴的影响，并将相关数据纳入风暴影响与海岸变化脆弱性评估工作。但此类研究传统上多聚焦于砂质海岸线与砂质障壁岛系统，未考量风暴对滨海湿地的影响。本“障壁岛与河口湿地物理变化评估”（Barrier Island and Estuarine Wetland Physical Change Assessment）项目旨在将湿地变化评估与毗邻砂质沙丘和海滩的现有海岸变化评估相结合，初期研究聚焦于马里兰州与弗吉尼亚州沿岸的阿萨蒂格岛（Assateague Island）。2012年10月，飓风桑迪（Hurricane Sandy）过境期间，阿萨蒂格岛遭受其伴随的海浪与风暴潮冲击，出现面向大洋的砂质海岸线侵蚀与越浪现象，同时在后障区域与河口海湾环境中发生侵蚀及越浪沉积。 本报告作为1984年至2014年Landsat 5与Landsat 8遥感影像衍生数据的归档资料，涵盖湿地与陆地生境分布范围、开阔大洋/后障区域及河口大陆海岸线位置，以及从马里兰州阿萨蒂格岛至弗吉尼亚州梅托姆普金岛（Metompkin Island）的河口大陆岸线与障壁岸线的砂线位置。附带正式联邦地理数据委员会（Federal Geographic Data Committee, FGDC）元数据的地理信息系统数据文件，可从http://pubs.usgs.gov/ds/0968/ds968_data.html 下载。